WO2000055995A1 - A receiver transponder for protected networks - Google Patents
A receiver transponder for protected networks Download PDFInfo
- Publication number
- WO2000055995A1 WO2000055995A1 PCT/SE2000/000544 SE0000544W WO0055995A1 WO 2000055995 A1 WO2000055995 A1 WO 2000055995A1 SE 0000544 W SE0000544 W SE 0000544W WO 0055995 A1 WO0055995 A1 WO 0055995A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical
- signal
- input terminal
- output terminal
- electronic
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0287—Protection in WDM systems
- H04J14/0293—Optical channel protection
- H04J14/0294—Dedicated protection at the optical channel (1+1)
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
- H04B10/275—Ring-type networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
Definitions
- the present invention relates to a receiver transponder used in an optical add and drop node and capable of handling optical switching for protecting paths in a network, in which the add and drop node is intended to be used, and also to a protected network in which such an optical add and drop node is used.
- Network availability is of significant importance in tele- and datacommunication networks evolving nowadays.
- One way of improving the availability of such networks com- prises building protection features into the networks such that efficient means are provided to switch traffic to a different path in the case of a failure somewhere in a path used.
- DWDM Densive Wavelength Division Multiplexing
- WDM Widelength Division Multiplexing
- OADM Optical Add and Drop
- add/drop nodes also called optical add and drop nodes or add/drop nodes, which contain the filters and couplers necessary to add, drop and block wavelengths which are terminated in the node.
- Each such OADM block 1 is connected to a left OADM block and to a right OADM block through pairs 3 of optical fibers, one pair outgoing from the considered node in a left hand or western direction and a second pair outgoing in a right hand or eastern direction.
- each OADM block 1 is connected to a transmitter- responder or transponder (TP) 5 and to a receiver (R) 7 through an optical switch 9.
- the transponder 5 transmits the wavelength signal in both directions and a block receiving the wavelength signal can choose the direction from which to receive that wavelength channel using its receiver 7 by setting its switch 9 accordingly.
- the receiver 7 receives light signals and converts them to for example electrical signals.
- a first path extending in a clockwise direction and a second path extending in counter-clockwise direction. Both paths can be used simultaneously, the first path for some channels and the second for other channels.
- the optical network as illustrated by the scheme of Fig. lb gives the same level of protection as that of Fig. la but may allow a more efficient use of transmitter power and a reuse of wavelengths in the ring architecture.
- the transponders 7 are connected to the OADM block 1 through optical switches 11 , allowing the direction to be chosen, in which the respective transponder will transmit. There may, however, also be concerns about the reliability of the transmitter optical switches 11 and the possibility to monitor the health of the protection path.
- the optical network of Fig. lc separate transponders 5', 5" are provided for transmitting in each direction, this layout not requiring any transmitter optical switches.
- this third network scheme also faults in a transmitter or in a transponder can be mitigated.
- a portion of the optical power is extracted using optical tapping couplers 25, 27 connected to the respective input fiber.
- the extracted signals are fed to optical-to-electrical converters 29, 31 converting the instant optical power to electric power representing the optical signal.
- the average power or the power levels of the two wavelength channels can then be measured as indicated by the outputs 33, 35.
- an overlaid embedded supervisory data channel can be detected in the electric signals by feeding the detected instant power signal to a supervisory channel receiver or supervisory channel receivers 37.
- the detected power levels at the outputs 33, 35 are used to monitor the health of the paths from the left and the right direction respectively and to make decisions about when and how to protect the node changing the position of an optical switch 39.
- This optical switch corresponds to the switch 9 of Figs, la - lc. Since a separate supervisory wavelength channel would be significantly more costly, both in terms of component cost and additional attenuation in the node, such an embedded channel solution is to be preferred.
- the other output ports of the tapping couplers 25, 27 are connected to the optical switch 39. The position of the switch 39 determines the direction from which the wavelength channel is to be received.
- the output of this switch 39 is fed into another optical tapping coupler 41 which has one output connected to another optical-to-electrical converter 43 providing an electric signal at an output 45, from which the average power of power level at the output of the optical switch 39 can be detected and monitored.
- Another output 46 from the tapping coupler 41 is intended to be connected to the client receiver (the receiver 7 in Figs, la - lc).
- Fig. 2 may be natural as well as economically and technically feasible. There are however a number of important issues which need to be o considered using this type of implementation based on an optical switch:
- a receiver transponder as outlined hereinafter deals with all the above issues in a very efficient manner.
- the wavelength channels, which are to be dropped in the node from the left and the right fiber directions, are converted by their respective optical-to- electrical (O/E) converters.
- O/E converters can be designed to have a suitable sensitivity and a suitable dynamic range for the actual application.
- the converters can also be used to protect for one another and they constitute a natural place to detect channel signal power and a supervisory channel at a close to zero cost.
- the output terminals of the O/E converters are connected to an electronic high frequency (HF) switch which handles the protection switching and which can be implemented at a low cost and using very reliable components such as a FET attenuator in each arm.
- HF electronic high frequency
- the output from the switch can be monitored for further definition of the health of the presently received signal before it enters a block in which the signal is reshaped, cleansed from the supervisory channel and given the proper drive levels for the following laser.
- This laser can be a low cost type since the signal is now amplified and reshaped and hence is relatively insensitive to the conditions between the laser and the client equipment. The signal from the laser can thus travel a significant distance through an optical fiber to the client receiver or sustain other forms of attenuation and still have a signal power which is sufficient for reliable detection.
- Fig. la is a diagram of a network which can handle a single fault in an optical fiber, in the cable holding a pair of fibers and connecting the OADM blocks or in an OADM block,
- Fig. lb is a diagram of a network similar to that of Fig. la which gives the same level of protection and allows a more efficient use of transmitter power and a reuse of wavelengths in the network,
- Fig. lc is a diagram of a network similar to that of Fig. la which gives a better level of protection and which can handle a single fault in a transmitter or in a transponder,
- Fig. 2 is a block diagram of the receiving side using an optical switch in an optical add and drop node in a network as illustrated in any of Figs, la - lc, and
- Fig. 3 is diagram of a network using an electric switch in an optical add and drop node in a network as illustrated in any of Figs, la - lc.
- Fig. 3 the receiving part of an optical add and drop node is shown.
- the optical signals enter the node at an input left fiber 21 and an input right fiber 23.
- the left input fiber is connected to a left optical-to-electrical or opto-electronic (O/E) converter 51 and the right input fiber is connected to a right opto-electronic (O/E) converter 53.
- the incoming light signals are converted to electrical signals such as by sensing the instantaneous light power of the incoming signals and representing the sensed power by an electric signal.
- the O/E converters can be designed to have a suitable sensitivity and dynamic range in order to correctly convert the light signals to be received.
- Each O/E converter 51 , 53 has output terminals 57, 59 providing the electric signals which represent the detected instantaneous channel signal power, from which the average power and a signal carrying a supervisory channel can be detected by monitoring circuits, not shown.
- the main output terminals of the O/E converters 51 , 53 are connected to an electronic high frequency (HF) switch 61 controlled by a control signal input on a control input terminal 63.
- the HF switch 61 handles the protection switching and it can be built at a low cost using very reliable components such as FETs (Field Effect Transistors).
- a portion of the output signal of the switch 61 is provided to monitoring circuits as represented by the electric line 65, which circuit are used for defining the health of the presently received signal.
- the other portion of the electric output signal is provided to a reshaping circuit block 67 in which the signal is reshaped, is cleansed from a supervisory channel and is given a proper power level for the following laser 69.
- the reshaped signal is provided to the laser 69 which can be a low cost type for typical applications.
- the optical signal output from the laser 69 can travel a significant distance through a fiber 71 to a client receiver or sustain other forms of attenuation and still have a sufficient signal power for reliable detection. If an electrical output signal would be desirable, it can of course be provided from the output of the reshaping circuit 67 as represented by the electric line 73. From such an electrical output signal a signal can be extracted for performance monitoring of client channels.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/936,961 US7327960B1 (en) | 1999-03-18 | 2000-03-20 | Receiver transponder for protected networks |
EP00919219A EP1166475A1 (en) | 1999-03-18 | 2000-03-20 | A receiver transponder for protected networks |
AU39927/00A AU3992700A (en) | 1999-03-18 | 2000-03-20 | A receiver transponder for protected networks |
US09/637,027 US6639703B1 (en) | 1999-03-18 | 2000-08-14 | Receiver transponder for protected networks |
US10/462,087 US7016609B2 (en) | 1999-03-18 | 2003-06-12 | Receiver transponder for protected networks |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9900991A SE516316C2 (en) | 1999-03-18 | 1999-03-18 | Receiver transponder for protected networks |
SE9900991-2 | 1999-03-18 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/637,027 Continuation US6639703B1 (en) | 1999-03-18 | 2000-08-14 | Receiver transponder for protected networks |
US10/462,087 Continuation US7016609B2 (en) | 1999-03-18 | 2003-06-12 | Receiver transponder for protected networks |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000055995A1 true WO2000055995A1 (en) | 2000-09-21 |
Family
ID=20414909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2000/000544 WO2000055995A1 (en) | 1999-03-18 | 2000-03-20 | A receiver transponder for protected networks |
Country Status (5)
Country | Link |
---|---|
US (3) | US7327960B1 (en) |
EP (1) | EP1166475A1 (en) |
AU (1) | AU3992700A (en) |
SE (1) | SE516316C2 (en) |
WO (1) | WO2000055995A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1292055A1 (en) * | 2001-09-07 | 2003-03-12 | Redfern Broadband Networks Inc. | CWDM network node module |
JP2006518132A (en) * | 2003-01-21 | 2006-08-03 | 富士通株式会社 | Optical network protection switching architecture |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE516316C2 (en) | 1999-03-18 | 2001-12-17 | Cisco Systems Sweden Ab | Receiver transponder for protected networks |
US7509047B2 (en) * | 2004-03-12 | 2009-03-24 | Futurewei Technologies, Inc. | System and method for subcarrier modulation in ISM band as supervisory channel |
JP4520763B2 (en) * | 2004-03-29 | 2010-08-11 | 富士通株式会社 | Relay transmission equipment |
CN101133575B (en) * | 2004-05-03 | 2012-06-20 | 华为技术有限公司 | System and method for subcarrier modulation in ISM band as supervisory channel |
US8078103B2 (en) * | 2005-10-31 | 2011-12-13 | Zih Corp. | Multi-element RFID coupler |
US8207814B2 (en) * | 2007-03-09 | 2012-06-26 | Utc Fire & Security Americas Corporation, Inc. | Kit and system for providing security access to a door using power over ethernet with data persistence and fire alarm control panel integration |
US20160359567A1 (en) * | 2015-06-02 | 2016-12-08 | Alcatel-Lucent Usa Inc. | Multi-endpoint optical receiver |
US10524130B2 (en) | 2017-07-13 | 2019-12-31 | Sophos Limited | Threat index based WLAN security and quality of service |
US11391894B1 (en) | 2021-11-11 | 2022-07-19 | Frontier Communications Holdings, Llc | Passive optical couplers having passive optical activity indicators and methods of operating the same |
US11350061B1 (en) * | 2021-11-11 | 2022-05-31 | Frontier Communications Holdings, Llc | Systems and methods for collecting information regarding optical connections in a fiber distribution hub of a passive optical network |
US11356177B1 (en) | 2021-11-11 | 2022-06-07 | Frontier Communications Holdings, Llc | Systems and methods for mapping optical connections in a fiber distribution hub of a passive optical network |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP0668674A2 (en) * | 1994-02-17 | 1995-08-23 | Kabushiki Kaisha Toshiba | Optical wavelength division multiplexed network system |
EP0689309A2 (en) * | 1994-06-24 | 1995-12-27 | Fujitsu Limited | Synchronous digital hierarchy 2-fiber ring having a selective protection function |
WO1998052314A2 (en) * | 1997-05-15 | 1998-11-19 | Telefonaktiebolaget Lm Ericsson (Publ) | An add and drop node for optical communication systems |
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US4829512A (en) * | 1986-08-26 | 1989-05-09 | Nec Corporation | Loop-back control apparatus for a loop network having duplicate optical fiber transmission lines |
US5229875A (en) | 1989-05-30 | 1993-07-20 | Glista Andrew S | Fault-tolerant fiber optic coupler/repeater for use in high speed data transmission and the like |
JPH088530B2 (en) * | 1989-07-27 | 1996-01-29 | 富士通株式会社 | Optical repeater |
JP2528225B2 (en) * | 1991-09-18 | 1996-08-28 | 富士通株式会社 | Transmission line switching method |
SE506748C2 (en) | 1995-06-26 | 1998-02-09 | Ericsson Telefon Ab L M | Method and apparatus for removing and adding channels in an optical multiplexer |
JPH10126350A (en) * | 1996-10-15 | 1998-05-15 | Nec Corp | Optical network, optical branch insertion node, and fault recovery system |
US5986783A (en) * | 1997-02-10 | 1999-11-16 | Optical Networks, Inc. | Method and apparatus for operation, protection, and restoration of heterogeneous optical communication networks |
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US6631018B1 (en) * | 1997-08-27 | 2003-10-07 | Nortel Networks Limited | WDM optical network with passive pass-through at each node |
SE516316C2 (en) | 1999-03-18 | 2001-12-17 | Cisco Systems Sweden Ab | Receiver transponder for protected networks |
-
1999
- 1999-03-18 SE SE9900991A patent/SE516316C2/en not_active IP Right Cessation
-
2000
- 2000-03-20 US US09/936,961 patent/US7327960B1/en not_active Expired - Lifetime
- 2000-03-20 EP EP00919219A patent/EP1166475A1/en not_active Withdrawn
- 2000-03-20 WO PCT/SE2000/000544 patent/WO2000055995A1/en not_active Application Discontinuation
- 2000-03-20 AU AU39927/00A patent/AU3992700A/en not_active Abandoned
- 2000-08-14 US US09/637,027 patent/US6639703B1/en not_active Expired - Lifetime
-
2003
- 2003-06-12 US US10/462,087 patent/US7016609B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0668674A2 (en) * | 1994-02-17 | 1995-08-23 | Kabushiki Kaisha Toshiba | Optical wavelength division multiplexed network system |
EP0689309A2 (en) * | 1994-06-24 | 1995-12-27 | Fujitsu Limited | Synchronous digital hierarchy 2-fiber ring having a selective protection function |
WO1998052314A2 (en) * | 1997-05-15 | 1998-11-19 | Telefonaktiebolaget Lm Ericsson (Publ) | An add and drop node for optical communication systems |
Non-Patent Citations (1)
Title |
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M. AJMONE MARSAN ET AL.: "Daisy: a scalable all-optical packet network with multifiber ring topology", COMPUTER NETWORKS AND ISDN SYSTEMS, vol. 30, no. 11, 22 June 1998 (1998-06-22), pages 1065 - 1082, XP004131750 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1292055A1 (en) * | 2001-09-07 | 2003-03-12 | Redfern Broadband Networks Inc. | CWDM network node module |
JP2006518132A (en) * | 2003-01-21 | 2006-08-03 | 富士通株式会社 | Optical network protection switching architecture |
Also Published As
Publication number | Publication date |
---|---|
US7016609B2 (en) | 2006-03-21 |
SE516316C2 (en) | 2001-12-17 |
AU3992700A (en) | 2000-10-04 |
SE9900991L (en) | 2000-09-19 |
US6639703B1 (en) | 2003-10-28 |
US20040175178A1 (en) | 2004-09-09 |
EP1166475A1 (en) | 2002-01-02 |
SE9900991D0 (en) | 1999-03-18 |
US7327960B1 (en) | 2008-02-05 |
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