CN101494499A - Erbium-doped fiber amplifier of fiber-optical cable television network - Google Patents
Erbium-doped fiber amplifier of fiber-optical cable television network Download PDFInfo
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- CN101494499A CN101494499A CNA2009100450572A CN200910045057A CN101494499A CN 101494499 A CN101494499 A CN 101494499A CN A2009100450572 A CNA2009100450572 A CN A2009100450572A CN 200910045057 A CN200910045057 A CN 200910045057A CN 101494499 A CN101494499 A CN 101494499A
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Abstract
The invention relates to an erbium-doped optical fiber amplifier in an optical fiber cable television network. The structure of the amplifier mainly comprises an optical coupler, an optical detector, an optical isolator, a pump light source, a wavelength division multiplexer, erbium fiber, an optical switch and a central processor. The erbium fiber of the amplifier is divided into N sections; through N subtracted by 1 of 1 * 2 type optical switches, the N sections of erbium fiber are connected in series at intervals; the gating of the f N subtracted by 1 of the 1 * 2 type optical switches is controlled by the central processor so as to obtain the length of the optimal erbium fiber corresponding to the power of different optical signals; and by combining with the adjustment of the pump power, the needed amplifier gain and the output optical signal power are achieved so as to be suitable for needs of different occasions. The erbium-doped optical fiber amplifier has simple implementation, effectively saves the length of the erbium fiber, can realize intelligence and improves the cost performance of the optical amplifier comprehensively.
Description
Technical field
The present invention relates to the erbium-doped fiber amplifier in a kind of optical fiber cable TV net, be applicable to the power amplification in Optical CATV (Community Antenna Television, the cable TV) system, preposition amplification, circuit amplification etc.Belong to the optical communication technique field.
Background technology
(erbium-doped fiber amplifier, research EDFA) and practicability have promoted development of Communication Technique to erbium-doped fiber amplifier greatly.Erbium-doped fiber amplifier has a wide range of applications in networks such as optical communication DWDM (densewavelength division multiplexing, dense wave division multipurpose) system and Optical Fiber CATV System.In large-scale optical fiber CATV system, use erbium-doped fiber amplifier and not only have tangible performance and price advantage, and can effectively enlarge the covering scale of network.Erbium-doped fiber amplifier directly amplifies light signal, need not to carry out the conversion of photoelectricity light, and have that power output is big, gain is high, working band is wide, with polarization irrelevant, noise figure low, amplification characteristic and characteristics such as systematic bits rate, data format have nothing to do, therefore it has become one of Primary Component of modern optical communication systems, is subjected to green grass or young crops especially and narrows in Optical Fiber CATV System.The research of erbium-doped fiber amplifier and application are key technologies of present Optical Fiber CATV System development.
In traditional erbium-doped fiber amplifier Study on Technology, thereby what study many and comparative maturity is the automatic gain control (AGC) that changes the pumping parameter resonance-amplifier gain of amplifier according to the output optical signal power, this technology can't be selected best running parameter according to input optical signal power, can not adapt to the needs of different occasions.In the research of the adaptive technique of EDFA, the EDFA that is meant research possesses certain intelligence, can be according to external condition (input optical signal power or output optical signal power), the running parameter of adjusting self makes the best performance of amplifier, applicable to different occasions.In existing adaptive technique research, adopt mostly and regulate the fine length of erbium, perhaps adopt the two-stage Optical Amplification Technology to take into account different emphasis (Xiao Shilin, Ceng Qingji, the adaptive technique research of Erbium-Doped Fiber Amplifier, optical communication technique, 2002,26 (1): 28-32).The fine length of erbium that preceding a kind of technology is selected for different input optical signals is different, the erbium fibre is not repeated to utilize, and therefore needs a large amount of erbium fibres, and structure is complicated and expensive, and adopting the technology of dual-stage amplifier, structure is not only complicated and difficultly reach good adaptive performance.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, design provides a kind of erbium-doped fiber amplifier that is applicable in the optical fiber cable TV net, and it is low to have a noise factor, the cost performance height, characteristics such as stable performance go for preposition amplification, power amplification, difference in functionalitys such as circuit amplification.
For achieving the above object, the present invention is divided into the N section with the erbium fibre in the amplifier, the optical switch by N-1 1 * 2 with N section erbium fibre apart from one another by being together in series, by the gating of the optical switch of central processing unit control N-1 1 * 2, obtain the fine length of different erbiums, reach the gain and the power output that need.
The structure of erbium-doped fiber amplifier of the present invention is specially: the output of input coupler links to each other with the input isolator with the input photodetector respectively, the output signal of input isolator and the pump light source signal that is controlled by central processing unit enter the erbium fibre through behind the wavelength division multiplexer, export to the output coupler through the output isolator through the output signal behind the erbium fibre, a part of output signal of output coupler feeds back to central processing unit through the output photodetector, and the output of input photodetector connects central processing unit.Described erbium fibre is divided into the N section, and apart from one another by being together in series, the gating by the optical switch of central processing unit control N-1 1 * 2 obtains the fine length of different erbiums to the optical switch by N-1 1 * 2, reaches the gain and the power output that need with N section erbium fibre.
Wherein, every segment length of the fine segmentation of described erbium can be identical, also can be different.
During amplifier work, regulate its running parameter according to input optical signal power and output optical signal power.Concrete grammar is to take out the part input signal light power by input coupler, the output of input coupler links to each other with the input isolator with the input photodetector respectively, and the output signal of input isolator and pump light source signal enter the erbium fibre through behind the wavelength division multiplexer.Because of the erbium fibre is connected in series by N-1 1 * 2 optical switch, 1 * 2 optical switch that gating is different can obtain the fine length of suitable erbium, and then obtains for the fine length of the needed best erbium of different input optical signal power.Export to the output coupler through the output isolator through the output light signal behind the erbium fibre, the part output light signal of output coupler feeds back to central processing unit through the output photodetector, the signal of input photodetector is also handled via central processing unit, regulate pump light source by central processing unit, control output optical signal power.The selection of the fine length of erbium can obtain the amplifier gain that needs and export optical signal power to adapt to the needs of different occasions in conjunction with the adjusting of pump power in the amplifier.
For a certain signal of input, can judge different function and usage according to input signal light power, when doing preposition amplifications, then requirement obtains sufficiently high gain and low noise; When the rate of doing work was amplified, then requiring had enough big power output; When doing the circuit amplification, then require to have enough big gain.
Compare with prior art, the invention solves the fixing problem that can not change of performance of traditional E DFA, solved the problem of existing intelligent erbium-doped fiber amplifier structure more complicated and expense costliness.Erbium-doped fiber amplifier of the present invention not only can be realized intellectuality easily, and control the fine length of erbium in this dependence and regulate in the research of gain and power output, effectively save the length of erbium fibre, only needed the optical switch of simple control N-1 individual 1 * 2, the just gain that can obtain wanting, realize different amplifier functions, it is low to have noise factor, cost performance height, characteristics such as stable performance, go for preposition amplification, power amplification, difference in functionalitys such as circuit amplification.The present invention is applied in the Optical Fiber CATV System, not only can effectively enlarge network coverage, further saves cost, can also be applied in optical sender end, the fiber transmission link flexibly and the optical receiver end simultaneously.
Description of drawings
Fig. 1 is the structured flowchart of erbium-doped fiber amplifier of the present invention.
Fig. 2 is for selecting the schematic diagram of the fine length of optimum erbium by optical switch.
Among Fig. 2, L
1, L
2, L
3, L
4Represent the erbium fibre of the identical or different length of each section respectively.
Fig. 3 is the relation curve of the fine length of amplifier gain, noise factor and erbium.
Fig. 4 is the relation curve of amplifier gain, noise factor and pump power.
Fig. 5 is the gain curve in the fine length range of certain erbium.
Embodiment
In order to understand technical scheme of the present invention better, execution mode is further described below in conjunction with accompanying drawing.
Fig. 1 has provided the structured flowchart of the erbium-doped fiber amplifier of the present invention's proposition.As shown in Figure 1, the output of input coupler links to each other with the isolator 1 of input photodetector and input respectively, the output signal of isolator 1 and the pump light source signal that is controlled by central processing unit enter the erbium fibre through behind the wavelength division multiplexer, export to the output coupler through the isolator 2 of output through the output signal behind the erbium fibre, a part of output signal of output coupler feeds back to central processing unit through the output photodetector, and the output of input photodetector connects central processing unit; Wherein the erbium fibre is divided into the N section, and apart from one another by being together in series, the gating by the optical switch of central processing unit control N-1 1 * 2 obtains the fine length of different erbiums to the optical switch by N-1 1 * 2, reaches the gain and the power output that need with N section erbium fibre.
Every section has identical or different length in the N section erbium fibre, and according to input optical signal power, the control optical switch is selected the fine length of optimum erbium flexibly, in conjunction with the adjusting of pump power, with gain and the noise factor that needing to obtain.
The course of work of amplifier is as follows:
(1) for the light signal of input, takes out the part input optical power through coupler.
(2) according to the effect of luminous power judgement amplifier, the control optical switch is selected the fine length of suitable erbium.When (as Fig. 2) supposed input optical signal power for-20dbm, select length was L
1+ L
2The erbium fibre, then control N * 1 optical switch and be communicated with optical switch (b), and optical switch (a) and optical switch (b) are communicated with, like this with regard to be-input optical signal of 20dbm disposed optimum erbium fibre length L
1+ L
2When needing to select other different erbiums fibre length, change the state of a control of respective switch.
(3) for the output light signal, take out the part Output optical power through the output coupler, judge whether power output reaches requirement, routine call Output optical power parameter, reading Output optical power, is the comparison controlling object with the Output optical power, by the voltage at control laser pump two ends, pump power is regulated the control Output optical power.
(4) comprehensive above monitoring for input optical signal and output light signal reaches the amplifier performance requirement that needs.
Amplifier of the present invention possesses certain intelligence, according to input optical signal and output light signal, adjusts its running parameter (fine length of erbium and pump power etc.), makes its operating state the best or makes its operating state meet extraneous needs.
Erbium-doped fiber amplifier of the present invention can be regulated fine length of erbium and pump power automatically according to different purposes, can amplify in preposition amplification, power amplification, circuit by self application.It is comparatively convenient that the control of this amplifier realizes, cost performance is higher, not only realizes the multi-functional different performance requirement that satisfies, and with general intelligentized amplifier by comparison, can effectively save cost.
Fig. 2 has provided the implementation of selecting the fine length of different optimum erbiums among the present invention.The control of the fine length of erbium comprises optical switch and identical or different each section erbium fibre of length.
Apart from one another by being together in series, export an end and connect next section optical fiber by 1 * 2 optical switch with N section erbium fibre for the optical switch of N-1 individual 1 * 2, and another output is connected to the input of N * 1 optical switch.Promptly pass through behind the erbium fibre of designated length through N * 1 optical switch output signal.
In this structure, optical switch can bring certain loss, is about about 0.3db.Long more erbium fibre, noise factor can be big more, so under the situation of big as far as possible gain, also should be taken into account the problem of noise factor, control switch is selected the fine length of suitable erbium.
Fig. 3 is under the certain condition of pump power and input optical signal power, the relation curve between the fine length of amplifier gain, noise factor and erbium.From Fig. 3 (a), can see, have a point that gain is maximum on the relation curve of the fine length of amplifier gain and erbium, promptly at the fine length of a certain erbium place, gain obtains maximum, the erbium fibre is shorter in length than or is longer than this length value, and gain all diminishes, and noise factor is less at the fine length of optimum erbium place.Can see that from Fig. 3 (b) along with the increase of input optical signal power, the fine length of the erbium at maximum gain place reduces.
Fig. 4 is under the certain condition of the fine length of input signal light power and erbium, the relation curve between amplifier gain, noise factor and the pump power.As we can see from the figure, Amplifier Gain increases along with the increase of pump power.Keep high gain, the size of necessary control input signals luminous power.In order to improve the Output optical power of EDFA, keep high-gain, so when increasing input optical signal power, and must strengthen pumping light power.
Fig. 5 is under the certain condition of pump power and input optical signal power, the relation curve between the fine length of amplifier gain and erbium.As we can see from the figure, in the fine length range of certain erbium, Amplifier Gain is approaching.
Claims (2)
1, the erbium-doped fiber amplifier in a kind of optical fiber cable TV net, the output of input coupler links to each other with the input isolator with the input photodetector respectively, the output signal of input isolator and the pump light source signal that is controlled by central processing unit enter the erbium fibre through behind the wavelength division multiplexer, export to the output coupler through the output isolator through the output signal behind the erbium fibre, a part of output signal of output coupler feeds back to central processing unit through the output photodetector, and the output of input photodetector connects central processing unit; It is characterized in that described erbium fibre is divided into the N section, apart from one another by being together in series, the gating by the optical switch of central processing unit control N-1 1 * 2 obtains the fine length of different erbiums to the optical switch by N-1 1 * 2, reaches the gain and the power output that need with N section erbium fibre.
2, the erbium-doped fiber amplifier in the optical fiber cable TV net according to claim 1 is characterized in that the fine every segment length of described erbium is identical or different.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100450572A CN101494499A (en) | 2009-01-08 | 2009-01-08 | Erbium-doped fiber amplifier of fiber-optical cable television network |
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| CNA2009100450572A CN101494499A (en) | 2009-01-08 | 2009-01-08 | Erbium-doped fiber amplifier of fiber-optical cable television network |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104301040A (en) * | 2014-10-10 | 2015-01-21 | 武汉电信器件有限公司 | 40 G long-distance pluggable optical module |
| CN105514784A (en) * | 2015-12-30 | 2016-04-20 | 桂林汉石科技有限公司 | Power-controllable single-channel erbium-doped fiber amplifier |
| CN108957905A (en) * | 2017-05-19 | 2018-12-07 | 中国电子科技集团公司第四十研究所 | A kind of multipurpose EDFA parameter fast optimal design device and its production, application method |
| CN110061407A (en) * | 2018-01-18 | 2019-07-26 | 武汉奥新科技有限公司 | A kind of adjustable erbium-doped fiber amplifier optical path of gain ranging |
| CN110445544A (en) * | 2018-05-02 | 2019-11-12 | 南京捷澳德信息科技有限公司 | Gain control method, system, image intensifer and the optical module of optical transport |
| CN112366501A (en) * | 2020-10-21 | 2021-02-12 | 昂纳信息技术（深圳）有限公司 | Erbium-doped optical fiber amplifier with wide gain adjustable range |
-
2009
- 2009-01-08 CN CNA2009100450572A patent/CN101494499A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104301040A (en) * | 2014-10-10 | 2015-01-21 | 武汉电信器件有限公司 | 40 G long-distance pluggable optical module |
| CN105514784A (en) * | 2015-12-30 | 2016-04-20 | 桂林汉石科技有限公司 | Power-controllable single-channel erbium-doped fiber amplifier |
| CN108957905A (en) * | 2017-05-19 | 2018-12-07 | 中国电子科技集团公司第四十研究所 | A kind of multipurpose EDFA parameter fast optimal design device and its production, application method |
| CN110061407A (en) * | 2018-01-18 | 2019-07-26 | 武汉奥新科技有限公司 | A kind of adjustable erbium-doped fiber amplifier optical path of gain ranging |
| CN110061407B (en) * | 2018-01-18 | 2020-08-07 | 武汉奥新科技有限公司 | Gain range adjustable erbium-doped optical fiber amplifier optical path |
| CN110445544A (en) * | 2018-05-02 | 2019-11-12 | 南京捷澳德信息科技有限公司 | Gain control method, system, image intensifer and the optical module of optical transport |
| CN110445544B (en) * | 2018-05-02 | 2020-12-15 | 南京捷澳德信息科技有限公司 | Gain control method and system for optical transmission, optical amplifier and optical module |
| CN112366501A (en) * | 2020-10-21 | 2021-02-12 | 昂纳信息技术（深圳）有限公司 | Erbium-doped optical fiber amplifier with wide gain adjustable range |
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Application publication date: 20090729 |