CN102710326B - Wavelength division multiplexing passive optical network system with remote node protecting function and realization method thereof - Google Patents
Wavelength division multiplexing passive optical network system with remote node protecting function and realization method thereof Download PDFInfo
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Abstract
The invention relates to a wavelength division multiplexing passive optical network system with a remote node protecting function and a realization method thereof. The wavelength division multiplexing passive optical network system comprises a central office (CO) which is connected with m remote nodes (RN) through two optical fibers to form an annular network; the RNs are connected with an optical network unit (ONU) through a distributed optical fiber; the central office end mainly comprises m*n optical transmitters, two arrayed waveguide gratings, an open-circuit circulator, three closed-circuit circulator, a 1*2 optical switches, a 2*2 optical switches, an optical coupler and m*n optical receivers; and the RNs mainly comprise three 2*2 optical switches, a 1*2 optical switch, a open-circuit circulator, four closed-circuit circulators, two optical couplers, a tunable optical filter, an optical wavelength barrier and a 1*n arrayed waveguide gratings. According to the wavelength division multiplexing passive optical network system disclosed by the invention, the protection for the RN nodes can be effectively realized, network users can be properly increased and the transmission distance is prolonged.
Description
Technical field
The present invention relates to optical communication field, specifically relate to a kind of Wave division multiplexing passive optical network (WDM-PON) system and the implementation method that possess distant-end node defencive function.
Background technology
Wave division multiplexing passive optical network WDM-PON technology can when not changing physical basis equipment upgrade bandwidth, significantly promote the transmission capacity of network, realize virtual point-to-point transmission, information can not be shared between each user, there is natural security, gather around in optical access network and have broad application prospects, be considered to the final selection of the following evolution of FTTx.Less for the WDM-PON structural research with defencive function at present, the comparatively common protection being also aimed at ONU node.The present invention has carried out rational layout to the architectural framework of system, makes system can under different fault modes, signal can be transmitted all the time on a closed loop, possessed extremely strong robustness.
Summary of the invention
The object of the invention is to the defect existed for prior art, provide a kind of Wave division multiplexing passive optical network (WDM-PON) system and the implementation method that possess distant-end node defencive function, effectively can realize the protection to RN node in WDM-PON.
For achieving the above object; core concept of the present invention is: at central local side CO place, photoswitch makes the transmission path of signal switch between different mode, arrives between far-end node RN and changes, when feeder fiber breaks down; for Signal transmissions finds new path, realize the protection to system.Adopt a kind of new structural allocation mode at RN place, by the structure of this new distant-end node RN, adapt to different fault modes.
According to foregoing invention design, the present invention adopts following scheme:
Possess a WDM passive optical network system for distant-end node defencive function, form circulus by central local side CO by two Fiber connection m distant-end node RN.Each distant-end node RN connects n optical network unit ONU by profile fiber, it is characterized in that:
1) in the central local side CO described in, mxn optical sender is connected to an array waveguide grating AWG1, a 1x2 photoswitch is connected to again via an open circuit circulator 1,2 port, open circuit circulator 3 ports be connected to waveguide array grating AWG2, AWG2 again by mxn bar Fiber connection to each receiver (0).Photoswitch two exports and is connected to a 2x2 photoswitch and first closed circulator 1 port respectively, first closed circulator 2 port is connected to 2x2 photoswitch, 3 ports are connected to the second closed circulator 1 port, and two output ports of 2x2 photoswitch are connected to two photoswitches of distant-end node RN01 respectively: a 2x2 photoswitch and 1x2 photoswitch; 2,3 ports of the second closed circulator are connected to 3 ports of the 3rd closed circulator (8) 1 port and coupler.2 ports of coupler are connected to 3 ports of the 3rd closed circulator, and 2 ports of closed circulator and 3 ports of coupler are connected to two photoswitches of distant-end node RNm respectively: 2x2 photoswitch and 1x2 photoswitch.
2) distant-end node RN comprises first, second, third 3 2x2 light and opens the light, 1 1x2 photoswitch, the 4th ~ the 74 closed circulator, 1 open circuit circulator, first, second 2 photo-couplers, 1 wavelength separator, 1 tunable wavelength filter and a waveguide array grating.Connected mode is as follows: 2 ports of a 2x2 photoswitch, 3 ports, and 4 ports are connected to 1x2 photoswitch 2 port respectively, the 2nd 2x2 photoswitch 1 port and the 4th closed circulator 1 port.3 ports of 1x2 photoswitch are connected to 2 ports of the 4th closed circulator, 2 ports of the 2nd 2x2 photoswitch, 3 ports, and 4 ports are connected to 1 port of the 5th closed circulator respectively, 2 ports of next RN node and the 3rd 2x2 photoswitch.2 ports of the 4th closed circulator, 3 ports are connected to 1 port of the first photo-coupler and 1 port of the second photo-coupler respectively.2 ports of the first photo-coupler, 3 ports are connected to the input of tunable optical filter and wavelength separator respectively, and the output of tunable optical filter and wavelength separator is connected to open circuit 1 port the 5th of circulator and 3 ports of closed circulator respectively.2 ports of the second photo-coupler, 3 ports, 4 ports are connected to 2 ports of the 5th closed circulator respectively, 1 port of the 3rd 2x2 photoswitch and 3 ports of open circuit circulator.3 ports of the 3rd 2x2 photoswitch and 4 ports are connected to 1 port of the 5th closed circulator and 1 port of the 7th closed circulator respectively.2 ports of the 7th closed circulator and 3 ports are connected to 2 ports of the 6th closed circulator and next RN node respectively.2 ports of open circuit circulator are connected to waveguide array grating AWG, and waveguide array grating AWG connects each ONU.
3) ONU comprises 1 receiver, a 1 reflection type semiconductor amplifier RSOA and power splitter.Two ports of power splitter connect receiver and reflection type semiconductor amplifier respectively.
A kind of Wave division multiplexing passive optical network implementation method possessing defencive function; system according to claim 1 is adopted to operate; it is characterized in that: under normal circumstances; time descending; nxm optical sender transmitting nxm wavelength in described central local side CO is synthesized in an optical fiber through waveguide array grating AWG1 and transmits; enter 1 port of open circuit circulator; 1 port entering 1x2 photoswitch is exported again by its 2 port; exported by 2 ports again; enter from 1 port of 2x2 photoswitch again; 3 ports export, and enter distant-end node RN1 by feeder fiber.Wavelength 01 to mn reaches RNm from RN01 clockwise, and in order to express easily, specify that there is identical number of wavelengths on each RN Chu Xia road at this, each RN Chu Xia road n wavelength, the wave band residing for RNj is
wherein
j
, after signal enters RN, here for RN2, signal enters 1 port of 2x2 photoswitch, exported by 4 ports, enter 1 port of the 4th closed circulator, exported by 2 ports, enter 1 port of the first coupler, now signal is divided into two-way, and route 2 port is derived, and enters the input of tunable optical filter TF, another route 3 port is derived, and enters the input of wavelength separator WB.Wave band corresponding to this RN node is exported via tunable filter TF process
.Output signal enters 1 port of open circuit circulator, then imports waveguide array grating AWG by 2 ports, finally exports from each output port of waveguide array grating AWG and gives receiver by power splitter and reflection type semiconductor amplifier RSOA receives.Wavelength separator WB has intercepted the signal of current RN node, so it exports as going out all downstream signals beyond wave band residing for current RN, this signal enters 3 ports of the 5th closed circulator, derived by 1 port, enter 2 ports of the 2nd 2x2 photoswitch and pass to next RN node from 3 ports outputs, by that analogy, until reach last RN node.Upward signal is produced by reflection type semiconductor amplifier, open circuit circulator 2 port is entered through waveguide array grating AWG, 4 ports entering the second coupler are exported again by 3 ports, export from 1 port of this coupler again and enter 3 ports of the 4th closed circulator, export from 1 port again, enter 4 ports of a 2x2 photoswitch again, then transfer to previous RN node by 1 port derivation of this photoswitch, be RN1 herein.In RN1, 2nd 2x2 photoswitch receives the upward signal from RN2, derived by 2 ports of this photoswitch again and enter 1 port of the 5th closed circulator, export from 2 ports again and enter 2 ports of the second coupler and export from 1 port, output signal enters 3 ports of the 4th closed circulator, derive from 1 port again and enter 4 ports of a 2x2 photoswitch, finally export from 1 port and enter central office side CO, return along the former road of the route of downstream signal after entering central office side, derive via open circuit circulator 3 port again, enter waveguide array grating AWG2, finally export to the receiver of each correspondence.
A kind of Wave division multiplexing passive optical network implementation method possessing defencive function; it is characterized in that: the feeder fiber system of breaking down between RN1 and RN2 enters protected mode 1; there is not any change in central authorities local side CO; because working optical fibre breaks down in RN1 node, so the 2nd 2x2 photoswitch in RN1 node switches to parastate by original crossing condition.So downstream signal just enters from 2 ports of the 2nd 2x2 photoswitch; 4 ports out; and enter 2 ports of the 3rd 2x2 photoswitch; and export from 3 ports; transfer to 1 port of the 6th closed circulator, then export from 2 ports, enter 2 ports of the 7th closed circulator; export from 3 ports again, enter next RN node by protection optical fiber.In RN2, because working optical fibre breaks down, so 1 port of a 2x2 photoswitch cannot receive the signal coming from RN1 in RN2 node, so a 2x2 photoswitch is switched to parastate from original crossing condition.1 port accepts of 1x2 photoswitch comes from the downlink data signal of RN1 node, and exports from 2 ports, enters 2 ports of a 2x2 photoswitch, then exports from 4 ports.The transmission path of subsequent signal is identical with during normal work.During signal uplink transmission, along former road through returning.
When there is fiber failure when between central local side CO and RN1 node, system enters protected mode 2, and the 2x2 photoswitch now in central local side CO switches to crossing condition by original parastate.Such downstream signal is just entered by 1 port of this photoswitch, and 4 ports export, and is transmitted by protection optical fiber.In RN1, a 2x2 photoswitch has original crossing condition to switch to parastate, enters from 2 ports of this photoswitch, and 4 ports export, subsequent signal transmission form with normal work identical.During uplink signal transmissions then according to former road through returning.
As RNk-1 node and RNk(
when between node, working optical fibre and protection optical fiber all break down, then system enters protected mode 3, here for RN2 and RN3.Now in central local side CO, 1x2 light opens the light and is switched to 1-3 conducting by original 1-2 conducting, and 2x2 light opens the light and switches to crossing condition by original parastate.Downstream signal enters via 1 port of 1x2 photoswitch, and 3 ports export.Enter 1 port of the first closed circulator again, and derive from 2 ports, then enter 2 ports of 2x2 photoswitch, exported by 3 ports, enter RN node by working optical fibre.Identical when subsequent optical signal transmission mode and normal work, until transfer to malfunctioning node place.Due to two fine trouble point corresponding have two RN nodes.Be RN2, RN3 herein.Be defined as " left ring " in the left side of malfunctioning node herein, right side is defined as " right ring ".At Zuo Huanzhong, downstream signal transfers to RN2, and in RN2, the 2nd 2x2 photoswitch switches to parastate by original crossing condition, and the 3rd 2x2 photoswitch is switched to parastate by original crossing condition, and 1x2 photoswitch switches to 1-3 conducting by 1-2 conducting.The concrete path of Signal transmissions is as follows: after signal enters node RN 2, and according to normal work path transmission until 2 ports of 2x2 photoswitch (17), the port now exported is 4 ports.Enter 2 ports of the 2nd 2x2 photoswitch again, then export from 4 ports, enter 1 port of the 7th closed circulator, and export from 2 ports, then input 3 ports of the 6th closed circulator, then export from 2 ports.Signal enters 3 ports of 1x2 photoswitch subsequently, and exports from 1 port, and pass to previous RN node, be RN1 herein.Uplink signal transmissions mode then with normally work identical.In RN1 node, 7th closed circulator receives the downstream signal coming from RN2 node, and export from port one, transmit 4 ports of three to 2x2 photoswitch, 3 ports transferring to the second photo-coupler are exported again by 1 port, export from 1 port again, downstream signal imports 3 ports of the 4th closed circulator immediately, finally enter 4 ports of a 2x2 photoswitch, and by 1 port by downlink data transmission extremely central local side CO, because the transmission of upstream data is identical with during normal mode of operation, so, the data that in remote node RN1,1 port of a 2x2 photoswitch exports have the upstream data of RN1 and RN2 and the downlink data signal of RN3 to RNm.Mixed signal is immediately from 3 port inputs of 2x2 photoswitch, 2 ports export, and enter 2 ports of the first closed circulator, export from 3 ports again, enter 1 port of the second closed circulator again, and export from 2 ports, then input 1 port of the 3rd closed circulator, and export from 2 ports, transfer to right ring.First, second 2x2 photoswitch in the situation bottom right ring of protected mode 3 in all distant-end nodes all switches to parastate by original crossing condition; wherein RN3 is last distant-end node of right ring, and the parastate residing for a 2x2 photoswitch in this node is vertical parastate.After mixed signal enters right ring, a road transfers to the 2x2 photoswitch in right ring end-node RN3.The transmission means of subsequent downstream signal is identical with under normal mode of operation, until 2 ports of 2x2 photoswitch, because photoswitch is in parastate, so signal then exports from 4 ports of this photoswitch, then 2 ports that the 3rd 2x2 light opens the light are entered, and exported by 3 ports, enter 1 port of the 6th closed circulator, export from 3 ports again, enter 2 ports of the 7th closed circulator again, exported by 3 ports, pass to previous RN node, output signal comprises the upward signal of RN1 and RN2 in left and remaining downstream signal again.Uplink signal transmissions mode in RN3 node is identical with normal mode of operation until transfer to the 2nd 2x2 photoswitch, parastate is in because this light opens the light, so upward signal is entered by 4 ports, 3 ports, then a curb Optical Fiber Transmission to central office side CO place.In distant-end node RN4,1x2 photoswitch, is entered by 1 port, and 2 ports go out, and the transmission of subsequent downstream signal is identical with normal mode of operation.By that analogy, downstream signal transmits down one by one along RN node, until central local side CO.In RN4, the transmission of upward signal is identical with normal mode of operation, until 4 ports of a 2x2 photoswitch, owing to entering protected mode 3, so upward signal is exported by 2 ports, enters 2 ports of 1x2 photoswitch, and is exported by 1 port, transfers to RN3 node.After entering RN3 node, the upward signal of node RN 4 enters 3 ports of the 7th closed circulator, and is exported by 1 port, is entering 4 ports of the 3rd 2x2 photoswitch, and exported by 1 port, enter 3 ports of the 4th photo-coupler again, then exported by 1 port, then enter 3 ports of closed circulator, export from 1 port again, finally enter 4 ports of 2x2 photoswitch, then exported by 3 ports, and by Optical Fiber Transmission of setting out on a journey.By that analogy, the upward signal of all RN nodes of right wing all needs to converge to RN3 node, and directly transfers to central office side CO by the optical fiber of setting out on a journey between first, second 2x2 photoswitch.
In the RNm node be connected with central office side CO, what optical fiber of setting out on a journey exported is the upward signal of right ring, the upward signal of what lower road exported is left ring.The upward signal of right ring is via 2 ports inputs of the 3rd closed circulator, and 3 ports export, and enter 2 ports of coupler.The signal of left ring enters 3 ports of coupler, two paths of signals is coupled into a road signal, successively through 3 ports, 1 port of 3 ports of the second closed circulator, 1 port and the first closed circulator, again by 1x2 photoswitch, finally import array waveguide grating AWG2 by 3 ports of open circuit circulator, then by it, upward signal is distributed to corresponding receiver.
Compared with prior art, unique advantage of the present invention and striking features are: 1) for single fiber fault, only need change the protection that photoswitch corresponding in adjacent two nodes two just can realize node.2) in extensive optical access network, namely in the great situation of RN number of nodes, when the two fine fault in appearance local, as cause because of geological disaster regional faults time, the two pairs of feeder fiber be connected with central local side CO can form a new loop fast, support communication.Designed by ring-like network structure, make the increase network user number that network can be suitable, extend transmission distance.
Accompanying drawing explanation
Fig. 1 is the WDM passive optical network system structural representation possessing defencive function in the present invention.
Fig. 2 is the structural representation of RN node in the WDM passive optical network system possessing defencive function in the present invention.
Fig. 3 is the Wave division multiplexing passive optical network system architecture schematic diagram in normal operating conditions possessing defencive function in the present invention.
Fig. 4 is the RN node structure schematic diagram under the Wave division multiplexing passive optical network normal operation possessing defencive function in the present invention.
Fig. 5 is the system architecture schematic diagram of Wave division multiplexing passive optical network in single fiber fault mode 1 situation possessing defencive function in the present invention.
Fig. 6 is the RN node structure schematic diagram of Wave division multiplexing passive optical network in single fiber fault mode 1 situation possessing defencive function in the present invention.
Fig. 7 be possess defencive function in the present invention Wave division multiplexing passive optical network in single fiber fault mode 2 situation
System architecture schematic diagram.
Fig. 8 is the RN node structure schematic diagram of Wave division multiplexing passive optical network in single fiber fault mode 2 situation possessing defencive function in the present invention.
Fig. 9 is the system architecture schematic diagram of Wave division multiplexing passive optical network under two fine failure condition possessing defencive function in the present invention.
Figure 10 is " left " RN node structure schematic diagram of Wave division multiplexing passive optical network under two-wire failure condition possessing defencive function in the present invention.
Figure 11 is " right wing " RN node structure schematic diagram of Wave division multiplexing passive optical network under two-wire failure condition possessing defencive function in the present invention.
Detailed description of the invention
Details are as follows by reference to the accompanying drawings for the preferred embodiments of the present invention:
Embodiment one:
See Fig. 1, originally possess the WDM passive optical network system of distant-end node defencive function, by central local side CO(1) by two Fiber connection m distant-end node RN(13,14) form circulus.Each distant-end node RN(13,14) n optical network unit ONU (30) is connected by profile fiber, it is characterized in that: described central local side CO(1) in, mxn optical sender (4) is connected to an array waveguide grating AWG1(2), a 1x2 photoswitch (9) is connected to again via an open circuit circulator (5) 1,2 ports, open circuit circulator (5) 3 ports be connected to waveguide array grating AWG2 (3), AWG2 (3) again by mxn bar Fiber connection to each receiver (0).1x2 photoswitch (9) two exports and is connected to a 2x2 photoswitch (10) and first closed circulator (7) 1 port respectively, first closed circulator (7) 2 port is connected to 2x2 photoswitch (10), 3 ports are connected to and close No. second circulator (6) 1 port, and two output ports of 2x2 photoswitch are connected to two photoswitches of distant-end node RN01 respectively: a 2x2 photoswitch (16) and 1x2 photoswitch (19); 2,3 ports of closed circulator (6) are connected to 3 ports of the 3rd closed circulator (8) 1 port and coupler (15).2 ports of coupler (15) are connected to 3 ports of the 3rd closed circulator (8), and 2 ports of closed circulator (8) and 3 ports of coupler (15) are connected to two photoswitches of distant-end node RNm respectively: a 2x2 photoswitch (16) and 1x2 photoswitch (19).
See Fig. 2 distant-end node RN(13,14) comprise first, second, third 3 2x2 light and open the light (16,17,18), 1 1x2 photoswitch (19), the 4th ~ the 74 closed circulator (20,21,22,23), 1 open circuit circulator (24), 2 photo-couplers (25,26), 1 wavelength separator (28), 1 tunable wavelength filter (27) and a waveguide array grating (29).Connected mode is as follows: 2 ports of a 2x2 photoswitch (16), 3 ports, and 4 ports are connected to 1x2 photoswitch (19) 2 port respectively, the 2nd 2x2 photoswitch (17) 1 port and the 4th closed circulator (20) 1 port.3 ports of 1x2 photoswitch (19) are connected to 2 ports of the 4th closed circulator (20), 2 ports of the 2nd 2x2 photoswitch (17), 3 ports, 4 ports are connected to 1 port of the 5th closed circulator (21) respectively, 2 ports of next RN node and the 3rd 2x2 photoswitch (18).2 ports of the 4th closed circulator (20), 3 ports are connected to 1 port of the first photo-coupler (25) and 1 port of the second photo-coupler (26) respectively.2 ports of the first photo-coupler (25), 3 ports are connected to the input of tunable optical filter (27) and wavelength separator (28) respectively, and the output of tunable optical filter (27) and wavelength separator (28) is connected to 1 port of open circuit circulator (24) and 3 ports of closed circulator (21) respectively.2 ports of photo-coupler (26), 3 ports, 4 ports are connected to 2 ports of the 5th closed circulator (21) respectively, 1 port of the 3rd 2x2 photoswitch (18) and 3 ports of open circuit circulator (24).3 ports of the 3rd 2x2 photoswitch (18) and 4 ports are connected to 1 port of the 7th closed circulator (22) respectively and close 1 port of No. seven circulator (23).2 ports of the 7th closed circulator (23) and 3 ports are connected to 2 ports of the 6th closed circulator (22) and next RN node respectively.2 ports of open circuit circulator (24) are connected to waveguide array grating AWG(29), waveguide array grating AWG(29) connect each ONU(30).
Embodiment two:
See Fig. 3, Fig. 4.Originally the Wave division multiplexing passive optical network implementation method of defencive function is possessed; it is characterized in that: in normal operating conditions; time descending; described central local side CO(1) in nxm optical sender (4) launch nxm wavelength through waveguide array grating AWG1(2) be synthesized in an optical fiber and transmit; enter 1 port of open circuit circulator (5); 1 port entering 1x2 photoswitch is exported again by its 2 port; exported by 2 ports again; enter from 1 port of 2x2 photoswitch (10) again; 3 ports export, and enter distant-end node RN1 by feeder fiber.Wavelength 01 to mn reaches RNm from RN01 clockwise, and in order to express easily, specify that there is identical number of wavelengths on each RN Chu Xia road at this, each RN Chu Xia road n wavelength, the wave band residing for RNj is
wherein
j
, after signal enters RN, here for RN2, signal enters 1 port of 2x2 photoswitch, exported by 4 ports, enter 1 port of the 4th closed circulator (20), exported by 2 ports, enter 1 port of the first coupler (25), now signal is divided into two-way, one route 2 port derive, enter tunable optical filter TF(27) input, another route 3 port derive, enter wavelength separator WB(28) input.Via tunable filter TF(27) process wave band corresponding to this RN of output node
.Output signal enters 1 port of open circuit circulator (24), waveguide array grating AWG(29 is imported again by 2 ports), finally export from waveguide array grating AWG (29) each output port and give receiver (31) and reflection type semiconductor amplifier RSOA(32 by power splitter (33)) receive.Wavelength separator WB(28) intercept the signal of current RN node, so it exports as going out all downstream signals beyond wave band residing for current RN, this signal enters 3 ports of the 5th closed circulator (21), derived by 1 port, enter 2 ports of the 2nd 2x2 photoswitch (17) and pass to next RN node from 3 ports outputs, by that analogy, until reach last RN node.Upward signal is produced by reflection type semiconductor amplifier, through waveguide array grating AWG(29) enter open circuit circulator (24) 2 port, 4 ports entering the second coupler (26) are exported again by 3 ports, export from 1 port of this coupler again and enter 3 ports of the 4th closed circulator (20), export from 1 port again, enter 4 ports of a 2x2 photoswitch (16) again, then transfer to previous RN node by 1 port derivation of this photoswitch, be RN1 herein.In RN1, 2nd 2x2 photoswitch (17) receives the upward signal from RN2, derived by 2 ports of this photoswitch again and enter 1 port of the 5th closed circulator (21), export from 2 ports again and enter 2 ports of the second coupler (26) and export from 1 port, output signal enters 3 ports of the 4th closed circulator (20), derive from 1 port again and enter 4 ports of a 2x2 photoswitch (16), finally export from 1 port and enter central office side CO(1), return along the former road of the route of downstream signal after entering central office side, derive via open circuit circulator (5) 3 port again, enter waveguide array grating AWG2(3), finally export to the receiver (0) of each correspondence.
Embodiment three
See Fig. 5, Fig. 6.Originally the Wave division multiplexing passive optical network implementation method of defencive function is possessed; it is characterized in that: the feeder fiber system of breaking down between RN1 and RN2 enters protected mode 1; central authorities local side CO(1) there is not any change; because working optical fibre breaks down in RN1 node, so the 2nd 2x2 photoswitch (17) in RN1 node switches to parastate by original crossing condition.So downstream signal just enters from 2 ports of the 2nd 2x2 photoswitch (17); 4 ports out; and enter 2 ports of the 3rd 2x2 photoswitch (18); and export from 3 ports; transfer to 1 port of the 6th closed circulator (22), then export from 2 ports, enter 2 ports of the 7th closed circulator (23); export from 3 ports again, enter next RN node by protection optical fiber.In RN2, because working optical fibre breaks down, so 1 port of a 2x2 photoswitch (16) cannot receive the signal coming from RN1 in RN2 node, so a 2x2 photoswitch (16) is switched to parastate from original crossing condition.1 port accepts of 1x2 photoswitch (19) comes from the downlink data signal of RN1 node, and exports from 2 ports, enters 2 ports of a 2x2 photoswitch (16), then exports from 4 ports.The transmission path of subsequent signal is identical with during normal work.During signal uplink transmission, along former road through returning.
Embodiment four
See Fig. 7, Fig. 8.Originally the Wave division multiplexing passive optical network implementation method of defencive function is possessed; it is characterized in that: as central local side CO(1) and RN1 node between when there is fiber failure; system enters protected mode 2, now central local side CO(1) in 2x2 photoswitch (10) switch to crossing condition by original parastate.Such downstream signal is just entered by 1 port of this photoswitch, and 4 ports export, and is transmitted by protection optical fiber.In RN1, a 2x2 photoswitch (16) has original crossing condition to switch to parastate, enters from 2 ports of this photoswitch, and 4 ports export, subsequent signal transmission form with normal work identical.During uplink signal transmissions then according to former road through returning.
Embodiment five
See Fig. 9, Figure 10, Figure 11.Originally possess the Wave division multiplexing passive optical network implementation method of defencive function, it is characterized in that: as RNk-1 node and RNk(
when between node, working optical fibre and protection optical fiber all break down, then system enters protected mode 3, here for RN2 and RN3.Now at central local side CO(1) in, 1x2 light open the light (9) be switched to 1-3 conducting by original 1-2 conducting, 2x2 light open the light (10) switch to crossing condition by original parastate.Downstream signal enters via 1 port of 1x2 photoswitch (9), and 3 ports export.Enter 1 port of the first closed circulator (7) again, and derive from 2 ports, then enter 2 ports of 2x2 photoswitch (10), exported by 3 ports, enter RN node by working optical fibre.Identical when subsequent optical signal transmission mode and normal work, until transfer to malfunctioning node place.Due to two fine trouble point corresponding have two RN nodes.Be RN2, RN3 herein.Be defined as " left ring " in the left side of malfunctioning node herein, right side is defined as " right ring ".At Zuo Huanzhong, downstream signal transfers to RN2, in RN2, the 2nd 2x2 photoswitch (17) switches to parastate by original crossing condition, and the 3rd 2x2 photoswitch (18) is switched to parastate by original crossing condition, and 1x2 photoswitch (19) switches to 1-3 conducting by 1-2 conducting.The concrete path of Signal transmissions is as follows: after signal enters node RN 2, and according to normal work path transmission until 2 ports of the 2nd 2x2 photoswitch (17), the port now exported is 4 ports.Enter 2 ports of the 3rd 2x2 photoswitch (18) again, then export from 4 ports, enter 1 port of the 7th closed circulator (23), and export from 2 ports, then input 3 ports of the 6th closed circulator (22), then export from 2 ports.Signal enters 3 ports of 1x2 photoswitch (19) subsequently, and exports from 1 port, and pass to previous RN node, be RN1 herein.Uplink signal transmissions mode then with normally work identical.In RN1 node, 7th closed circulator (23) receives the downstream signal coming from RN2 node, and export from port one, transfer to 4 ports of the 3rd 2x2 photoswitch (18), 3 ports transferring to the second photo-coupler (26) are exported again by 1 port, export from 1 port again, downstream signal imports 3 ports of the 4th closed circulator (20) immediately, finally enter 4 ports of a 2x2 photoswitch (16), and by 1 port by downlink data transmission extremely central local side CO(1), because the transmission of upstream data is identical with during normal mode of operation, so, the data that in remote node RN1,1 port of a 2x2 photoswitch (16) exports have the upstream data of RN1 and RN2 and the downlink data signal of RN3 to RNm.Mixed signal is immediately from 3 port inputs of 2x2 photoswitch (10), 2 ports export, and enter 2 ports of the first closed circulator (7), export from 3 ports again, enter 1 port of the second closed circulator (6) again, and export from 2 ports, then input 1 port of the 3rd closed circulator (8), and export from 2 ports, transfer to right ring.First, second 2x2 photoswitch (16 in the situation bottom right ring of protected mode 3 in all distant-end nodes; 17) all parastate is switched to by original crossing condition; wherein RN3 is last distant-end node of right ring, and the parastate residing for a 2x2 photoswitch (16) in this node is vertical parastate.After mixed signal enters right ring, a road transfers to the 2x2 photoswitch (16) in right ring end-node RN3.The transmission means of subsequent downstream signal is identical with under normal mode of operation, until 2 ports of 2x2 photoswitch, because photoswitch is in parastate, so signal then exports from 4 ports of this photoswitch, then enter the 3rd 2x2 light to open the light 2 ports of (18), and exported by 3 ports, enter 1 port of the 6th closed circulator (22), export from 3 ports again, enter 2 ports of the 7th closed circulator (23) again, exported by 3 ports again, pass to previous RN node, output signal comprises the upward signal of RN1 and RN2 in left and remaining downstream signal.Uplink signal transmissions mode in RN3 node is identical with normal mode of operation until transfer to a 2x2 photoswitch (16), parastate is in because this light opens the light, so upward signal is entered by 4 ports, 3 ports, then a curb Optical Fiber Transmission to central office side CO(1) place.In distant-end node RN4,1x2 photoswitch (19), is entered by 1 port, and 2 ports go out, and the transmission of subsequent downstream signal is identical with normal mode of operation.By that analogy, downstream signal transmits down one by one along RN node, until central local side CO(1).In RN4, the transmission of upward signal is identical with normal mode of operation, until 4 ports of a 2x2 photoswitch (16), owing to entering protected mode 3; so upward signal is exported by 2 ports; enter 2 ports of 1x2 photoswitch (19), and exported by 1 port, transfer to RN3 node.After entering RN3 node, the upward signal of node RN 4 enters 3 ports of the 7th closed circulator (23), and is exported by 1 port, is entering 4 ports of the 3rd 2x2 photoswitch (18), and exported by 1 port, enter 3 ports of photo-coupler again, then exported by 1 port, then enter 3 ports of the 4th closed circulator (20), export from 1 port again, finally enter 4 ports of 2x2 photoswitch, then exported by 3 ports, and by Optical Fiber Transmission of setting out on a journey.By that analogy, the upward signal of all RN nodes of right wing all needs to converge to RN3 node, and directly transfers to central office side CO (1) by the optical fiber of setting out on a journey between the first, the one 2x2 photoswitch (16,17).
In the RNm node be connected with central office side CO (1), what optical fiber of setting out on a journey exported is the upward signal of right ring, the upward signal of what lower road exported is left ring.The upward signal of right ring is via 2 ports inputs of the 3rd closed circulator (8), and 3 ports export, and enter 2 ports of coupler (15).The signal of left ring enters 3 ports of coupler (15), two paths of signals is coupled into a road signal, successively through 3 ports, 1 port of 3 ports of the second closed circulator (6), 1 port and the first closed circulator (7), again by 1x2 photoswitch (9), finally import array waveguide grating AWG2(3 by 3 ports of open circuit circulator (5)), then by it, upward signal is distributed to corresponding receiver (0).
Claims (3)
1. possess a WDM passive optical network system for distant-end node defencive function, by central local side CO(1) by two Fiber connection m distant-end node RN(13,14) form circulus; Each distant-end node RN(13,14) connect n optical network unit ONU by profile fiber, it is characterized in that:
1) the central local side CO(1 described in) in, mxn optical sender (4) is connected to an array waveguide grating AWG1(2), a 1x2 photoswitch (9) is connected to again via an open circuit circulator (5) 1,2 ports, open circuit circulator (5) 3 ports be connected to waveguide array grating AWG2 (3), AWG2 (3) again by mxn bar Fiber connection to each receiver (0); 1x2 photoswitch (9) two exports and is connected to a 2x2 photoswitch (10) and first closed circulator (7) 1 port respectively, first closed circulator (7) 2 port is connected to 2x2 photoswitch (10), 3 ports are connected to the second closed circulator (6) 1 port, and two output ports of 2x2 photoswitch are connected to two photoswitches (16,19) of distant-end node RN01 respectively: a 2x2 photoswitch (16) and 1x2 photoswitch (19); 2,3 ports of the second closed circulator (6) are connected to 1 port of the 3rd closed circulator (8) 1 port and coupler (15); 2 ports of coupler (15) are connected to 3 ports of the 3rd closed circulator (8), and 2 ports of the 3rd closed circulator (8) and 3 ports of coupler (15) are connected to two photoswitches of distant-end node RNm respectively: 3 ports of the 2nd 2x2 photoswitch (17) and the 7th closed circuit circulator (23);
2) distant-end node RN(13,14) comprise first, second, third 3 2x2 light and open the light (16,17,18), 1 1x2 photoswitch (19), the 4th ~ the 74 closed circulator (20,21,22,23), 1 open circuit circulator (24), first, second 2 photo-couplers (25,26), 1 wavelength separator (28), 1 tunable wavelength filter (27) and a waveguide array grating (29); Connected mode is as follows: 2 ports of a 2x2 photoswitch (16), 3 ports, and 4 ports are connected to 1x2 photoswitch (19) 2 port respectively, the 2nd 2x2 photoswitch (17) 1 port and the 4th closed circulator (20) 1 port; 3 ports of 1x2 photoswitch (19) are connected to 2 ports of the 6th closed circulator (22), 2 ports of the 2nd 2x2 photoswitch (17), 3 ports, 4 ports are connected to 1 port of the 5th closed circulator (21) respectively, 2 ports of next RN node and the 3rd 2x2 photoswitch (18); 2 ports of the 4th closed circulator (20), 3 ports are connected to 1 port of the first photo-coupler (25) and 1 port of the second photo-coupler (26) respectively; 2 ports of the first photo-coupler (25), 3 ports are connected to the input of tunable optical filter (27) and wavelength separator (28) respectively, and the output of tunable optical filter (27) and wavelength separator (28) is connected to 1 port of open circuit circulator (24) and 3 ports of the 5th closed circulator (21) respectively; 2 ports of the second photo-coupler (26), 3 ports, 4 ports are connected to 3 ports of 2 ports of the 5th closed circulator (21), 1 port of the 3rd 2x2 photoswitch (18) and open circuit circulator (24) respectively; 3 ports of the 3rd 2x2 photoswitch (18) and 4 ports are connected to 1 port of the 6th closed circulator (22) and 1 port of the 7th closed circulator (23) respectively; 2 ports of the 7th closed circulator (23) and 3 ports are connected to 3 ports of the 6th closed circulator (22) and next RN node respectively; 2 ports of open circuit circulator (24) are connected to waveguide array grating AWG(29), waveguide array grating AWG(29) connect each ONU(30);
3) ONU (30) comprises 1 receiver (31), 1 reflection type semiconductor amplifier RSOA(32) and a power splitter (33); Two ports of power splitter (33) connect receiver (31) and reflection type semiconductor amplifier (32) respectively.
2. one kind possesses the Wave division multiplexing passive optical network implementation method of distant-end node defencive function, the WDM passive optical network system possessing distant-end node defencive function according to claim 1 is adopted to operate, it is characterized in that: under normal circumstances, time descending, described central local side CO(1) in nxm optical sender (4) launch nxm wavelength through waveguide array grating AWG1(2) be synthesized in an optical fiber and transmit, enter 1 port of open circuit circulator (5), 1 port entering 1x2 photoswitch is exported again by its 2 port, exported by 2 ports again, enter from 1 port of 2x2 photoswitch (10) again, 3 ports export, distant-end node RN1 is entered by feeder fiber, wavelength 01 to mn reaches RNm from RN01 clockwise, and in order to express easily, specify that there is identical number of wavelengths on each RN Chu Xia road at this, each RN Chu Xia road n wavelength, the wave band residing for RNj is λ
(j-1) 1~ λ
(j-1) nwherein 1≤j≤m, after signal enters RN, here for RN2, signal enters 1 port of 2x2 photoswitch, exported by 4 ports, enter 1 port of the 4th closed circulator (20), exported by 2 ports, enter 1 port of the first coupler (25), now signal is divided into two-way, one route 2 port derive, enter tunable optical filter TF(27) input, another route 3 port derive, enter wavelength separator WB(28) input, via tunable filter TF(27) process wave band λ corresponding to this RN of output node
11~ λ
1n, output signal enters 1 port of open circuit circulator (24), waveguide array grating AWG(29 is imported again by 2 ports), finally export from waveguide array grating AWG (29) each output port and give receiver (31) and reflection type semiconductor amplifier RSOA(32 by power splitter (33)) receive, wavelength separator WB(28) intercept the signal of current RN node, so it exports as going out all downstream signals beyond wave band residing for current RN, this signal enters 3 ports of closed circulator (21), derived by 1 port, enter 2 ports of 2x2 photoswitch (17) and pass to next RN node from 3 ports outputs, by that analogy, until reach last RN node, upward signal is produced by reflection type semiconductor amplifier, through waveguide array grating AWG(29) enter open circuit circulator (24) 2 port, 4 ports entering the second coupler (26) are exported again by 3 ports, export from 1 port of this coupler again and enter 3 ports of the 4th closed circulator (20), export from 1 port again, enter 4 ports of a 2x2 photoswitch (16) again, then transfer to previous RN node by 1 port derivation of this photoswitch, be RN1 herein, in RN1, 2nd 2x2 photoswitch (17) receives the upward signal from RN2, derived by 2 ports of this photoswitch again and enter 1 port of the 5th closed circulator (21), export from 2 ports again and enter 2 ports of the second coupler (26) and export from 1 port, output signal enters 3 ports of the 4th closed circulator (20), derive from 1 port again and enter 4 ports of a 2x2 photoswitch (16), finally export from 1 port and enter central office side CO(1), return along the former road of the route of downstream signal after entering central office side, derive via open circuit circulator (5) 3 port again, enter waveguide array grating AWG2(3), finally export to the receiver (0) of each correspondence.
3. the Wave division multiplexing passive optical network implementation method possessing defencive function according to claim 2, it is characterized in that: the feeder fiber system of breaking down between RN1 and RN2 enters protected mode 1, central authorities local side CO(1) there is not any change, because working optical fibre breaks down in RN1 node, so the 2nd 2x2 photoswitch (17) in RN1 node switches to parastate by original crossing condition;
So downstream signal just enters from 2 ports of the 2nd 2x2 photoswitch (17), 4 ports out, and enter 2 ports of the 3rd 2x2 photoswitch (18), and export from 3 ports, transfer to 1 port of the 6th closed circulator (22), then export from 3 ports, enter 2 ports closing No. seven circulator (23), export from 3 ports again, enter next RN node by protection optical fiber; In RN2, because working optical fibre breaks down, so 1 port of a 2x2 photoswitch (16) cannot receive the signal coming from RN1 in RN2 node, so a 2x2 photoswitch (16) is switched to parastate from original crossing condition; 1 port accepts of 1x2 photoswitch (19) comes from the downlink data signal of RN1 node, and exports from 2 ports, enters 2 ports of a 2x2 photoswitch (16), then exports from 4 ports; The transmission path of subsequent signal is identical with during normal work; During signal uplink transmission, along former road through returning;
As central local side CO(1) and RN1 node between when there is fiber failure, system enters protected mode 2, now central local side CO(1) in 2x2 photoswitch (10) switch to crossing condition by original parastate, such downstream signal is just entered by 1 port of this photoswitch, and 4 ports export, and is transmitted by protection optical fiber, in RN1, a 2x2 photoswitch (16) has original crossing condition to switch to parastate, enters from 2 ports of this photoswitch, and 4 ports export, subsequent signal transmission form with normal work identical, during uplink signal transmissions then according to former road through returning, when when between RNk-1 node and RNk node, working optical fibre and protection optical fiber all break down, then system enters protected mode 3, here for RN2 and RN3: now at central local side CO(1) in, 1x2 light open the light (9) be switched to 1-3 conducting by original 1-2 conducting, 2x2 light open the light (10) switch to crossing condition by original parastate, downstream signal enters via 1 port of 1x2 photoswitch (9), and 3 ports export, enter 1 port of the first closed circulator (7) again, and derive from 2 ports, then enter 2 ports of 2x2 photoswitch (10), exported by 3 ports, enter RN node by working optical fibre, identical when subsequent optical signal transmission mode and normal work, until transfer to malfunctioning node place, due to two fine trouble point corresponding have two RN nodes, be RN2, RN3 herein, the left side of malfunctioning node is defined as " left ring ", right side is defined as " right ring ", at Zuo Huanzhong, downstream signal transfers to RN2, in RN2, the 2nd 2x2 photoswitch (17) switches to parastate by original crossing condition, 3rd 2x2 photoswitch (18) is switched to parastate by original crossing condition, and 1x2 photoswitch (19) switches to 1-3 conducting by 1-2 conducting, the concrete path of Signal transmissions is as follows: after signal enters node RN 2, and according to normal work path transmission until 2 ports of the 2nd 2x2 photoswitch (17), the port now exported is 4 ports, enter 2 ports of the 3rd 2x2 photoswitch (18) again, then export from 4 ports, enter 1 port of the 7th closed circulator (23), and export from 2 ports, then input 3 ports of the 6th closed circulator (22), then export from 2 ports, signal enters 3 ports of 1x2 photoswitch (19) subsequently, and exports from 1 port, and pass to previous RN node, be RN1 herein, uplink signal transmissions mode then with normally work identical, in RN1 node, 7th closed circulator (23) receives the downstream signal coming from RN2 node, and export from port one, transfer to 4 ports of the 3rd 2x2 photoswitch (18), 3 ports transferring to the first photo-coupler (26) are exported again by 1 port, export from 1 port again, downstream signal imports 3 ports of the 4th closed circulator (20) immediately, finally enter 4 ports of a 2x2 photoswitch (16), and by 1 port by downlink data transmission extremely central local side CO(1), because the transmission of upstream data is identical with during normal mode of operation, so, the data that in remote node RN1,1 port of a 2x2 photoswitch (16) exports have the upstream data of RN1 and RN2 and the downlink data signal of RN3 to RNm, mixed signal is immediately from 3 port inputs of 2x2 photoswitch (10), 2 ports export, and enter 2 ports of the first closed circulator (7), export from 3 ports again, enter 1 port of the second closed circulator (6) again, and export from 2 ports, then input 1 port of the 3rd closed circulator (8), and export from 2 ports, transfer to right ring, first, second 2x2 photoswitch (16 in the situation bottom right ring of protected mode 3 in all distant-end nodes, 17) all parastate is switched to by original crossing condition, wherein RN3 is last distant-end node of right ring, and the parastate residing for a 2x2 photoswitch (16) in this node is vertical parastate, after mixed signal enters right ring, a road transfers to the 2x2 photoswitch (16) in right ring end-node RN3, the transmission means of subsequent downstream signal is identical with under normal mode of operation, until 2 ports of 2x2 photoswitch, because photoswitch is in parastate, so signal then exports from 4 ports of this photoswitch, then enter the 3rd 2x2 light to open the light 2 ports of (18), and exported by 3 ports, enter 1 port of the 6th closed circulator (22), export from 3 ports again, enter 2 ports of closed circulator (23) again, exported by 3 ports, pass to previous RN node, output signal comprises the upward signal of RN1 and RN2 in left and remaining downstream signal again, uplink signal transmissions mode in RN3 node is identical with normal mode of operation until transfer to a 2x2 photoswitch (16), parastate is in because this light opens the light, so upward signal is entered by 4 ports, 3 ports go out, and then a curb Optical Fiber Transmission to central office side CO(1) place, in distant-end node RN4,1x2 photoswitch (19), is entered by 1 port, and 2 ports go out, and the transmission of subsequent downstream signal is identical with normal mode of operation, by that analogy, downstream signal transmits down one by one along RN node, until central local side CO(1), in RN4, the transmission of upward signal is identical with normal mode of operation, until 4 ports of a 2x2 photoswitch (16), owing to entering protected mode 3, so upward signal is exported by 2 ports, enter 2 ports of 1x2 photoswitch (19), and exported by 1 port, transfer to RN3 node, after entering RN3 node, the upward signal of node RN 4 enters 3 ports of the 7th closed circulator (23), and is exported by 1 port, is entering 4 ports of the 3rd 2x2 photoswitch (18), and exported by 1 port, enter 3 ports of photo-coupler again, then exported by 1 port, then enter 3 ports of the 4th closed circulator (20), export from 1 port again, finally enter 4 ports of 2x2 photoswitch, then exported by 3 ports, and by Optical Fiber Transmission of setting out on a journey, by that analogy, the upward signal of all RN nodes of right wing all needs to converge to RN3 node, and directly transfers to central office side CO (1) by the optical fiber of setting out on a journey between first, second 2x2 photoswitch, in the RNm node be connected with central office side CO (1), what optical fiber of setting out on a journey exported is the upward signal of right ring, the upward signal of what lower road exported is left ring, the upward signal of right ring is via 2 ports inputs of the 3rd closed circulator (8), 3 ports export, and enter 2 ports of coupler (15), the signal of left ring enters 3 ports of coupler (15), two paths of signals is coupled into a road signal, successively through 3 ports, 1 port of 3 ports of the second closed circulator (6), 1 port and the first closed circulator (7), again by 1x2 photoswitch (9), finally import array waveguide grating AWG2(3 by 3 ports of open circuit circulator (5)), then by it, upward signal is distributed to corresponding receiver.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002005439A2 (en) * | 2000-07-07 | 2002-01-17 | Sycamore Networks, Inc. | Bi-directional wavelength switched ring optical protection switching wavelength assignment algorithm |
| CN1094007C (en) * | 1995-06-26 | 2002-11-06 | 艾利森电话股份有限公司 | self-healing network |
| CN201608719U (en) * | 2010-04-14 | 2010-10-13 | 东南大学 | Wavelength division multiplexing passive optical network protection switching device |
| CN101895463A (en) * | 2010-04-20 | 2010-11-24 | 上海大学 | System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network) |
-
2012
- 2012-06-04 CN CN201210179206.6A patent/CN102710326B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1094007C (en) * | 1995-06-26 | 2002-11-06 | 艾利森电话股份有限公司 | self-healing network |
| WO2002005439A2 (en) * | 2000-07-07 | 2002-01-17 | Sycamore Networks, Inc. | Bi-directional wavelength switched ring optical protection switching wavelength assignment algorithm |
| CN201608719U (en) * | 2010-04-14 | 2010-10-13 | 东南大学 | Wavelength division multiplexing passive optical network protection switching device |
| CN101895463A (en) * | 2010-04-20 | 2010-11-24 | 上海大学 | System and method for achieving network reconfigurability of mixed WDM (Wavelength Division Multiplexing)/TDM (Time Division Multiplexing) PON (Passive Optical Network) |
Non-Patent Citations (2)
| Title |
|---|
| "A Novel Architecture of Reconfigurable WDM/TDM-PON";Yanan Cao等;《2010 19th Annual Wireless and Optical Communications Conference (WOCC)》;20100514;1-4 * |
| "Self-healing ring-based WDM-PON";Yang Zhou等;《Optics Communications》;20100501;第283卷(第9期);1732-1736 * |
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