CN1412616A - Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier - Google Patents
Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier Download PDFInfo
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- CN1412616A CN1412616A CN02147746A CN02147746A CN1412616A CN 1412616 A CN1412616 A CN 1412616A CN 02147746 A CN02147746 A CN 02147746A CN 02147746 A CN02147746 A CN 02147746A CN 1412616 A CN1412616 A CN 1412616A
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- raman
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- ase
- fiber amplifier
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Abstract
The present invention mainly utilizes the spontaneous raidation noise of backward pump, i.e. light power level of ASE to implement autoamtic control of Raman gain of Raman optical-fibre amplifier and compensation. Its Raman optical-fibre amplifier is characterized by that at the signal light detection place a combination of filter and photoelectric detector for detecting the backward ASE power of Raman optical fibre amplifier nearby dirrerent wavelength is added, the output of the photoelectric detector is connected with control unit of automatic regulation of gain of Raman amplifier.
Description
Technical field
The present invention relates to a kind of Raman gain Real-time and Dynamic control and the method and the Raman fiber amplifier thereof that compensate, be specifically related to optical communication the light channel structure design of field Raman fiber amplifier and the Raman gain locking of amplifier.
Background technology
If a weak signal and a heavy pumping light wave transmit in optical fiber simultaneously, and the weak signal wavelength is placed in the Raman gain bandwidth of pump light, weak signal light can obtain amplifying, and this image intensifer based on stimulated Raman scattering mechanism promptly is called Raman fiber amplifier.The gain spectral of Raman fiber amplifier is by the characteristic decision of the wavelength and the optical fiber of pump laser.Under the condition of the single pumping wavelength of 1455nm, G.652, G.655 the Raman gain spectrum in (Leaf), the DCF optical fiber basic configuration as shown in Figure 1.Can see G.652, the basic configuration of the Raman gain spectrum among the Leaf, DCF optical fiber is inconsistent.
In order to obtain comparatively smooth optical signal gain spectrum, can adopt the pump laser of a plurality of wavelength, in their mutual influences and separately under the acting in conjunction of gain spectral, can obtain comparatively smooth gain spectral.But in the practical application of distributed Raman fiber amplifier, consider in time aging of optical fiber and, can make the loss factor of optical fiber become big, thereby Raman gain is reduced with the influence of the factors such as variation of ambient temperature.In order to obtain the Raman fiber amplifier of Gain Automatic control and compensation, we have adopted novel light channel structure, as Fig. 2, shown in Figure 3: by automatic control and compensation to the Raman amplifier Raman gain realized to the locking of ASE power level in the back.
Summary of the invention
Purpose of the present invention is exactly to overcome the problem and shortage that prior art exists, and provides a kind of and can make adjustable method of Raman gain Real-time and Dynamic and Raman fiber amplifier thereof.Specifically, under the influence of factors such as promptly aging at optical fiber, variation of ambient temperature, it is constant that Raman gain keeps.We find that by theoretical analysis and a large amount of test the actual gain of Raman fiber amplifier and Raman amplifier spontaneous emission noise are that the power power level of ASE is closely related; The gain at each signal frequency place can be determined by the power level of the ASE of this frequency place.By survey the different frequency place back to ASE (with flashlight in the same way, reverse with pump light) luminous power and adopt special light channel structure, reach and make the Raman gain Raman fiber amplifier of control and compensation automatically.And when enhancing product performance, reduce the manufacturing cost of product.
Of the present invention being achieved in that
Raman gain Real-time and Dynamic control of the present invention and the method that compensates, comprise power detection and adjustment, it is characterized in that: utilize the optical power levels of the spontaneous emission noise of backward pump to realize the automatic control and the compensation of Raman fiber amplifier Raman gain, the luminous power ASE of the spontaneous emission noise of backward pump and signal output are in the same way, reverse with pump light, according to the power level of back, calculate actual Raman amplifier gain, thereby the Real-time and Dynamic that realizes the Raman amplifier gain is adjustable to ASE.
Described Raman gain Real-time and Dynamic control and the method that compensates, be to add wave filter and photodetector combination in flashlight detection place, survey near the back of the Raman fiber amplifier in different wave length position, thereby realize the Real-time and Dynamic adjustment and the control of Raman amplifier gain to ASE power.
The Raman fiber amplifier that is used for the method for above-mentioned Raman gain Real-time and Dynamic control and compensation, comprise raman pumping source, pumping/signal wave multiplexer, flashlight branch device and control module, the back wave filter and the photodetector combination to ASE power of near the Raman fiber amplifier flashlight detection place adds the detection different wave length, the output of photodetector connects the control module of automatic adjustment Raman amplifier gain.
Described Raman fiber amplifier, it is back that it surveys near different wave length position Raman fiber amplifier is that bandpass filter by several different center frequency combines with photodetector to ASE power.
Described Raman fiber amplifier, the centre frequency of its bandpass filter still can not overlap with signal frequency near signal frequency, and the quantity of bandpass filter, centre frequency and bandwidth be specific design as the case may be.
Described Raman fiber amplifier, near its back of Raman fiber amplifier of surveying the different wave length position is to be combined with photodetector by optic tunable filter to ASE power.
The present invention has the following advantages and good effect:
1) can be back to the ASE power level according to what survey, the Raman gain of real-time and dynamic resonance-amplifier finally makes Raman gain keep constant.
2) light channel structure is simple, is easy to realize, when enhancing product performance, can effectively reduce cost.
3) can thoroughly solve since factors such as optical fiber is aging, ambient temperature variation to the influence of Raman gain, thereby it is very little that the Raman gain of the Raman fiber amplifier of its making is changed, and keeps constant substantially.
Description of drawings
Fig. 1-be the basic configuration of raman gain coefficient in the different fiber, transverse axis frequency displacement (THz), the longitudinal axis is raman gain coefficient (10^ (3)/mW km); 1.1 be basic configuration, 1.2 basic configurations, 1.3 the basic configurations of the raman gain coefficient of dispersion compensating fiber for the raman gain coefficient of common G.652 optical fiber for the raman gain coefficient of (Leaf) optical fiber G.655.
Fig. 2 is the most preferred embodiment light channel structure figure that ASE power of the present invention is surveyed.Wherein:
2.1-be Transmission Fibers,
2.2-be pumping/signal wave multiplexer,
2.3-be the raman pumping source,
2.4.1,2.4.2,2.4.3-be photodetector,
2.5-flashlight branch device,
2.6.1,2.6.2,2.6.3-be the passive light bandpass filter
2.7-be the Raman amplifier control module
The characteristic of various piece and function declaration:
2.1-be Transmission Fibers, be used for the medium of transmission signals light and pump light.
2.2-for pumping/signal wave multiplexer, be used for optical passive component that pump light is coupled to flashlight, wherein 2.2.1 is the common port (be the pumping output terminal of Raman amplifier, the while also is the input end of signal) of device; 2.2.2 be the signal end of device; 2.2.3 be the pumping end of device.
2.3-be the raman pumping source, be used for carrying out the pumping source that Raman amplifies.
2.4.1,2.4.2,2.4.3-be photodetector, is used for a light signal that detects is changed into electric signal, the electric signal that is obtained is simultaneously gathered by the control module of Raman amplifier.
2.5-be flashlight branch device, be used for flashlight is carried out optical passive component along separate routes, wherein 2.5.1 is the main end of shunt of device, as the signal output part of Raman amplifier; 2.5.2 be device from end, as the input of Raman amplifier.
2.6.1,2.6.2,2.6.3-be the passive light bandpass filter, is used for making the light in a certain bandwidth to pass through, the outer light of this bandwidth is filtered out, wherein 2.6.1.1,2.6.2.1,2.6.3.1 are respectively the band go side of 2.6.1,2.6.2,2.6.3; 2.6.1.2,2.6.2.2,2.6.3.2 be respectively the non-band go side of 2.6.1,2.6.2,2.6.3; 2.6.1.3,2.6.2.3,2.6.3.3 be respectively the input end of 2.6.1,2.6.2,2.6.3.
2.7-be the Raman amplifier control module, the control center of whole Raman amplifier, the electric signal of simultaneously also gathering 2.4.1,2.4.2,2.4.3 and being obtained, thus realize the automatic gain control and compensation of Raman amplifier.
Concrete connection can be described as: 2.1 are connected with 2.2 common port; 2.2 the pumping end be connected with 2.3,2.2 signal output part be connected with 2.5 input end; 2.5 the main end of output be connected with the final signal output terminal of Raman amplifier, 2.5 output end of probe is connected with the input end of 2.6.1.2.6.1 non-band go side be connected with the input end of 2.6.2; 2.6.2 non-band go side be connected with the input end of 2.6.3.2.4.1, the light input end of 2.4.2,2.4.3 is connected with the logical output terminal of band of 2.6.1,2.6.2,2.6.3 respectively.The electric signal that is obtained by 2.4.1,2.4.2,2.4.3 is respectively the control module 2.7 of Raman amplifier and is gathered.
Fig. 3-carry out the light channel structure that signal light power scans with tunable optic filter.2.8 be optic tunable filter, 2.9 is photodetector.
Fig. 4-in dwdm system, back to Raman amplifier to the Frequency point A of ASE power real-time detection point, B point, C point.
Fig. 5-in the relation curve of the ASE at sensing point place noise power and gain (experiment with calculate)
Embodiment
Automatically control and the Raman gain derivation in theory of compensated optical fiber to the power level of ASE according to the back, determined at the ASE power that needs only in a certain bandwidth under the situation of backward pump, then determine with regard to unique at the Raman gain of this point, this with the kind of optical fiber (as G.652, G.655 (Leaf), DCF etc.) and irrelevant, and also irrelevant with pumping wavelength with a kind of different decay of optical fiber.
We have designed and have utilized the back to carry out the automatic control and the compensation technique of the Raman gain of Raman amplifier to the ASE power level under above guide of theory.
Raman amplifier is according to the ASE power level that detects, calculate the Raman gain of each point by control module, and adjust the power level of its pumping automatically, make the power of the ASE of each point keep the level that needs, thereby realize the Real-time and Dynamic adjustment and the control of Raman amplifier gain.
Can know by theoretical derivation and experimental result, under the certain situation of each point ASE power, Raman gain at this some place is determined with regard to unique, therefore the power of can be easily adjusting pump laser automatically by the control module of Raman amplifier remains unchanged the ASE luminous power at respective center frequency place or changes in very little scope, and is near and realize the automatic control and the compensation of Raman gain in the whole amplification bandwidth.
Core of the present invention is to utilize the optical power levels of the spontaneous emission noise of backward pump to realize the automatic control and the compensation of Raman fiber amplifier Raman gain, according to the power level of back to ASE, calculate actual Raman amplifier gain, thereby the Real-time and Dynamic that realizes the Raman amplifier gain is adjustable.Therefore, the foregoing description does not limit protection scope of the present invention.
Claims (6)
1, a kind of Raman gain Real-time and Dynamic control and the method that compensates, comprise power detection and adjustment, it is characterized in that: utilize the optical power levels of the spontaneous emission noise of backward pump to realize the automatic control and the compensation of Raman fiber amplifier Raman gain, the luminous power of the spontaneous emission noise of backward pump is ASE, ASE and signal output are in the same way, reverse with pump light, according to the power level of back to ASE, calculate actual Raman amplifier gain, thereby the Real-time and Dynamic that realizes the Raman amplifier gain is adjustable.
2, Raman gain Real-time and Dynamic control according to claim 1 and the method that compensates, it is characterized in that adding wave filter and photodetector combination in flashlight detection place, survey near the back of the Raman fiber amplifier in different wave length position, thereby realize the Real-time and Dynamic adjustment and the control of Raman amplifier gain to ASE power.
3, be used for the Raman gain Real-time and Dynamic control of claim 1 or 2 and the Raman fiber amplifier of the method for compensation, comprise raman pumping source, pumping/signal wave multiplexer, flashlight branch device and control module, it is characterized in that: the back wave filter and the photodetector combination to ASE power of near the Raman fiber amplifier flashlight detection place adds the detection different wave length, the output of photodetector connects the control module of automatic adjustment Raman amplifier gain.
4, Raman fiber amplifier according to claim 3, it is characterized in that surveying near the different wave length position Raman fiber amplifier back be that bandpass filter by several different center frequency combines with photodetector to ASE power.
5, the adjustable Raman fiber amplifier of a kind of Real-time and Dynamic that gains according to claim 4, it is characterized in that: the centre frequency of bandpass filter is near signal frequency, but can not overlap with signal frequency, the quantity of bandpass filter, centre frequency and bandwidth be specific design as the case may be.
6, Raman fiber amplifier according to claim 3, it is characterized in that surveying near the back of Raman fiber amplifier in different wave length position is to be combined with photodetector by optic tunable filter to ASE power.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021477469A CN1208883C (en) | 2002-11-28 | 2002-11-28 | Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier |
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| CNB021477469A CN1208883C (en) | 2002-11-28 | 2002-11-28 | Raman gain real time kinetic control and compensation method and its Raman optical-fibre amplifier |
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| CN1412616A true CN1412616A (en) | 2003-04-23 |
| CN1208883C CN1208883C (en) | 2005-06-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304899C (en) * | 2003-09-15 | 2007-03-14 | 中兴通讯股份有限公司 | Device and method for realizing auto-control gain of on-line fibre-optical Raman amplifier |
| CN101552428B (en) * | 2008-12-24 | 2011-04-06 | 武汉光迅科技股份有限公司 | Online matt Raman amplifier with automatic shutdown and starting and control method thereof |
| EP2538586A1 (en) | 2011-06-24 | 2012-12-26 | Accelink Technologies Co., Ltd. | Method of performing target raman gain locking and raman fiber amplifier |
| CN105122682A (en) * | 2014-01-22 | 2015-12-02 | 华为技术有限公司 | Method and device for determining gain of raman optical amplifier, and raman optical amplifier |
| CN105580295A (en) * | 2013-09-26 | 2016-05-11 | 思科技术公司 | Multi-wavelength distributed Raman amplification set-up |
-
2002
- 2002-11-28 CN CNB021477469A patent/CN1208883C/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304899C (en) * | 2003-09-15 | 2007-03-14 | 中兴通讯股份有限公司 | Device and method for realizing auto-control gain of on-line fibre-optical Raman amplifier |
| CN101552428B (en) * | 2008-12-24 | 2011-04-06 | 武汉光迅科技股份有限公司 | Online matt Raman amplifier with automatic shutdown and starting and control method thereof |
| EP2538586A1 (en) | 2011-06-24 | 2012-12-26 | Accelink Technologies Co., Ltd. | Method of performing target raman gain locking and raman fiber amplifier |
| US8797640B2 (en) | 2011-06-24 | 2014-08-05 | Accelink Technologies Co., Ltd | Method of performing target Raman gain locking and Raman fiber amplifier |
| CN105580295A (en) * | 2013-09-26 | 2016-05-11 | 思科技术公司 | Multi-wavelength distributed Raman amplification set-up |
| CN105580295B (en) * | 2013-09-26 | 2018-05-01 | 思科技术公司 | Method and device for multi-wavelength distributed raman amplification |
| CN105122682A (en) * | 2014-01-22 | 2015-12-02 | 华为技术有限公司 | Method and device for determining gain of raman optical amplifier, and raman optical amplifier |
| US9768582B2 (en) | 2014-01-22 | 2017-09-19 | Huawei Technologies Co., Ltd. | Method and apparatus for determining gain of raman optical amplifier and raman optical amplifier |
| CN105122682B (en) * | 2014-01-22 | 2019-04-23 | 华为技术有限公司 | Determine the method, apparatus and raman optical amplifier of the gain of raman optical amplifier |
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| Publication number | Publication date |
|---|---|
| CN1208883C (en) | 2005-06-29 |
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Owner name: WUHAN GUANGXUN TECHNOLOGY CO., LTD. Free format text: FORMER NAME OR ADDRESS: WUHAN GUANGXUN SCIENCE AND TECHNOLOGY CO., LTD. |
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Address after: 430070 Hubei Province, Wuhan city Hongshan District YouKeYuan Road No. 88 Accelink technology development and management department Patentee after: ACCELINK TECHNOLOGIES Co.,Ltd. Address before: 430070 Hubei Province, Wuhan city Hongshan District YouKeYuan Road No. 88 Accelink technology development and management department Patentee before: Accelink Technologies Co.,Ltd. |
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Granted publication date: 20050629 |