CN203673196U - Tellurite-based optical fiber Raman amplification controller with flat gain - Google Patents

Tellurite-based optical fiber Raman amplification controller with flat gain Download PDF

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Publication number
CN203673196U
CN203673196U CN201420009233.3U CN201420009233U CN203673196U CN 203673196 U CN203673196 U CN 203673196U CN 201420009233 U CN201420009233 U CN 201420009233U CN 203673196 U CN203673196 U CN 203673196U
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China
Prior art keywords
coupling mechanism
input end
light
isolator
optical fiber
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CN201420009233.3U
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Chinese (zh)
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向红丽
袁心易
宁博
王沛
左旭
赵云
姜小波
李君改
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Xian University of Posts and Telecommunications
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Xian University of Posts and Telecommunications
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Abstract

The utility model discloses a tellurite-based optical fiber Raman amplification controller with a flat gain. The controller comprises a first coupler, a first isolator, a second coupler, a second isolator, a third coupler, a control unit and a polarized wave combiner. The tellurite-based optical fiber Raman amplification controller with the flat gain is simple in structure, novel and reasonable in design, low in implementation cost, capable of achieving signal amplification in an existing and future dense wavelength division multiplexing system, good in output flatness, high in practicability, good in using effect and convenient to popularize and use.

Description

A kind of telluro optical fiber Raman amplification controller of flat gain
Technical field
The utility model relates to the telluro optical fiber Raman amplification controller in optical communication technique field, particularly a kind of flat gain.
Background technology
In optical fiber telecommunications system, the light signal of transmitter transmitting can be decayed in the process along Optical Fiber Transmission, and also can introduce a large amount of losses such as the optical component such as multiplexer and coupling mechanism.A little less than the accumulative total decay of light signal and loss will make signal too and cannot detect at output terminal.In order to prevent the generation of this situation, the intensity of necessary restoring signal.
Before not yet using optical amplifier, only way is exactly by regenerated signal, that is first receives signal and again launching it.This process can realize with regenerator: first it become light signal into electric signal, passes through signal shaping, then is transformed back into light signal, then continues transmission.
The appearance of erbium-doped optical fiber amplifier EDFA (Erbium Doped Fiber Amplifier), is greatly improved the performance of whole communication system.Regenerator must be for specific bit rate in communication system and specific modulation format work, and Erbium-Doped Fiber Amplifier (EDFA) is not subject to the restriction of bit rate and signal format.Therefore, use the system of Erbium-Doped Fiber Amplifier (EDFA) to be easy to upgrading, such as, for higher bit stream, without reconfiguring Erbium-Doped Fiber Amplifier (EDFA).On the contrary, for using the system of regenerator, this upgrading must be changed all regenerators and could realize.Moreover Erbium-Doped Fiber Amplifier (EDFA) has wider gain bandwidth (GB), therefore, single Erbium-Doped Fiber Amplifier (EDFA) can amplify multiple wavelength-division multiplex signals simultaneously.If but use regenerator, need to use multiple regenerators to amplify different wavelength.Thus, Erbium-Doped Fiber Amplifier (EDFA) has become the important devices in present stage optical communication system.
But along with the progressively development of optical communication system, the bandwidth of image intensifer becomes a key factor of its development of puzzlement.The bandwidth of tradition Erbium-Doped Fiber Amplifier (EDFA) only has about 30nm, and Raman amplifier based on telluro optical fiber has larger amplified broad band.As long as the parameters such as the quantity to pump light, performance number, wavelength are reasonably controlled, just can realize across the signal of wave band and amplifying.This is to dense wavelength division multiplexing system capacity expansion and upgrading, and reduce costs and increase business etc. has very important Technological Economy and be worth.
Summary of the invention
The purpose of this utility model is the telluro optical fiber Raman amplification controller that a kind of flat gain will be provided, it is simple in structure, rationally novel in design, realize cost low, the signal that can realize in existing and following dense wavelength division multiplexing system amplifies, and output flatness is good, practical, result of use is good, is convenient to promote the use of.
For achieving the above object, the utility model is implemented according to following technical scheme:
A telluro optical fiber Raman amplification controller for flat gain, comprises the first coupling mechanism, the first isolator, the second coupling mechanism, the second isolator, the 3rd coupling mechanism, control module, polarized wave combiner, described in:
The first coupling mechanism is for separating multiplexed signals light;
The first isolator is used for isolating reverse transfer light;
The second coupling mechanism is for being coupled to multiplexed signals light and pump light;
The second isolator is used for isolating reverse signal light;
The 3rd coupling mechanism is for separating the flashlight after transmission;
Control module is used for regulating each pump light parameter;
Polarized wave combiner closes road for Dui Ge road pump light;
The input end of described the first coupling mechanism connects light input end, the output terminal of the first coupling mechanism connects respectively the input end of the first isolator and the input end of control module, the output terminal of described the first isolator is connected with the input end of the second coupling mechanism by one section of telluro optical fiber, the output terminal of described the second coupling mechanism is connected with the input end of the second isolator, the output terminal of described the second isolator is connected with the input end of the 3rd coupling mechanism, the output terminal of described the 3rd coupling mechanism joins with input end and the light output end of control module respectively, the output terminal of described control module is connected with the input end of multiple pump laser source, the input end of described multiple pump laser source is connected with the input end of polarized wave combiner, the output terminal of described polarized wave combiner is connected with the input end of the second coupling mechanism.
As further preferred version of the present utility model, described control module is by for carrying out the Raman gain counting circuit of signals collecting, for more last time with the decision circuit of this gain change amount with form for the control circuit of Pumping parameters being made to control to flashlight before and after transmission.
As further preferred version of the present utility model, in described multiplexed signals light, the centre wavelength of any one wavelength and described each pump laser source meets Δ v=(1/ λ pj)-(1/ λ si), wherein, Δ v is frequency shift amount, and the value of Δ v is 700cm -1～786cm -1.
As further preferred version of the present utility model, the Raman gain spectrum of described telluro highly nonlinear optical fiber is at 700cm -1～786cm -1frequency swing in, corresponding graceful gain coefficient scope is 2.97 × 10 -12m/W～3.98 × 10 -12m/W.
Compared with prior art, the beneficial effects of the utility model are:
1, of the present utility model simple in structure, reasonable in design, it is convenient to realize;
2, the utility model is retaining phase place and the amplitude information of signal light-wave in wavelength conversion compared with normal optical-electrical-optical wavelength shifter, has the strict transmission transparency;
3, of the present utility model to realize cost low, and cost, than low many of normal optical-electrical-optical amplifier, can directly be amplified in light territory flashlight;
4, amplification of the present utility model is with widely, by pump light is carried out to suitable configuration, just can realize all band, or even across the amplification of wave band;
5, of the present utility model can integrated level high, can be used as a discrete device and directly in wavelength-division multiplex system, use;
6, of the present utility model practical, result of use is good, is convenient to promote the use of.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
In figure: 101-light input end; 102-light output end; 201-the first coupling mechanism; 202-the 3rd coupling mechanism; 301-the first isolator; 302-the second isolator; 401-telluro optical fiber; 501-the second coupling mechanism; 601-polarized wave wave multiplexer; 701-pump laser source; 801-control module; 8011-Raman gain counting circuit; 8012-decision circuit; 8013-control circuit;
Fig. 2 is the Raman gain spectrum of the utility model telluro optical fiber;
Fig. 3 is flat gain schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described, is used for explaining the utility model in illustrative examples and the explanation of this utility model, but not as to restriction of the present utility model.
The telluro optical fiber Raman amplification controller of a kind of flat gain as shown in Figure 1, comprise the first coupling mechanism 201 for multiplexed signals light (light signal of input) is separated and for isolating the first isolator 301 of reverse transfer light, for the second coupling mechanism 501 that multiplexed signals light and pump light are coupled with for isolating the second isolator 302 of reverse signal light, for the 3rd coupling mechanism 202 that the flashlight after transmission is separated, for regulating the control module 801 of each pump light parameter and closing the polarized wave combiner 601 on road for Dui Ge road pump light.The input end of described the first coupling mechanism 201 connects light input end 101, the output terminal of described the first coupling mechanism 201 connects respectively the input end of the first isolator 301 and the input end of control module 801, the output terminal of described the first isolator 301 is connected with the input end of described the second coupling mechanism 501 by one section of telluro optical fiber 401, the output terminal of described the second coupling mechanism 501 is connected with the input end of described the second isolator 201, the output terminal of described the second isolator 302 is connected with the input end of described the 3rd coupling mechanism 202, the output terminal of described the 3rd coupling mechanism 202 joins with input end and the light output end 102 of described control module 801 respectively, the output terminal of described control module 801 is connected with the input end of stating multiple pump laser source 701, the input end of described multiple pump laser source 701 is connected with the input end of described polarized wave combiner 601, the output terminal of described polarized wave combiner 601 is connected with the input end of the second coupling mechanism 501.
Control module 801 described in the present embodiment is by for carrying out the Raman gain counting circuit 8011 of signals collecting, for more last time with the decision circuit 8012 of this gain change amount with form 8013 for the control circuit of Pumping parameters being made to control to flashlight before and after transmission.
In the light of multiplexed signals described in the present embodiment, the centre wavelength of any one wavelength and the each Pu of described pump lasing light emitter 701 meets Δ v=(1/ λ pj)-(1/ λ si), wherein, Δ v is frequency shift amount, and the value of Δ v is 700cm -1～786cm -1.
The Raman gain spectrum of the highly nonlinear optical fiber of telluro described in the present embodiment 401 is at 700cm -1～786cm -1frequency swing in, as shown in Figure 2, corresponding graceful gain coefficient scope is 2.97 × 10 -12m/W～3.98 × 10 -12m/W.
The method that adopts the utility model to carry out Raman's amplification, comprises the following steps:
Step 1, flashlight enter Raman amplifier system through light input end.In the present embodiment, the wavelength coverage of choosing flashlight is 1544nm～1556nm, and each wavelength interval is 0.4nm, is spaced apart 50GHz, totally 32 channels, and each signal light power is 0.01mW:
Step 2, light signal carry out partial wave by the first coupling mechanism to it through after light input end, and wherein a part of light signal sends to Raman gain counting circuit after opto-electronic conversion, and a part sends in the first isolator in addition;
Step 3, Raman gain counting circuit the Raman gain to before and after transmission relatively after, through decision circuit, finally considering, under the prerequisite of gain flatness and power service efficiency, to be provided the optimal value of the multiple pump laser source output parameters including wavelength, watt level and the number of pumping by the algorithm routine in control circuit.In the present embodiment, the initial number of choosing pump laser source is 4, and initial power size is 500mW, and initial pump light wavelength is according to according to frequency displacement computing formula Δ v=(1/ λ pj)-(1/ λ si), the centre wavelength of its pump laser source is 1340nm.And according to Fig. 3, a kind of limiting case is, adopts 32 pump laser source corresponding with flashlight number, and according to frequency displacement computing formula Δ v=(1/ λ pj)-(1/ λ si), its wavelength coverage is from 1374.6nm～1386nm, and each wavelength interval is also 0.4nm.In Fig. 3, P1, P2 represents 32 pump lights to P32, S1, S2 represents 32 flashlights to S32.
The pump light that step 4, pump light lasing light emitter send closes ripple by polarization combiner, enters telluro optical fiber via the second coupling mechanism, carries out stimulated Raman scattering effect with flashlight on optical fiber, and the power of flashlight is amplified;
Step 5, flashlight are through amplifying afterwards by the second isolator, by the 3rd coupling mechanism, it is carried out to partial wave, a part sends to light output end, and another part light signal sends to Raman gain counting circuit after opto-electronic conversion, start the process of repeating step three, until reach optimal value.
The technical solution of the utility model is not limited to the restriction of above-mentioned specific embodiment, and every technology distortion of making according to the technical solution of the utility model, within all falling into protection domain of the present utility model.

Claims (4)

1. the telluro optical fiber Raman amplification controller of a flat gain, it is characterized in that: comprise the first coupling mechanism (201), the first isolator (301), the second coupling mechanism (501), the second isolator (302), the 3rd coupling mechanism (202), control module (801), polarized wave combiner (601), described in:
The first coupling mechanism (201) is for separating multiplexed signals light;
The first isolator (301) is for isolating reverse transfer light;
The second coupling mechanism (501) is for being coupled to multiplexed signals light and pump light;
The second isolator (302) is for isolating reverse signal light;
The 3rd coupling mechanism (202) is for separating the flashlight after transmission;
Control module (801) is for regulating each pump light parameter;
Polarized wave combiner (601) closes road for Dui Ge road pump light;
The input end of described the first coupling mechanism (201) connects light input end (101), the output terminal of the first coupling mechanism (201) connects respectively the input end of the first isolator (301) and the input end of control module (801), the output terminal of described the first isolator (301) is connected with the input end of the second coupling mechanism (501) by one section of telluro optical fiber (401), the output terminal of described the second coupling mechanism (501) is connected with the input end of the second isolator (201), the output terminal of described the second isolator (302) is connected with the input end of the 3rd coupling mechanism (202), the output terminal of described the 3rd coupling mechanism (202) joins with input end and the light output end (102) of control module (801) respectively, the output terminal of described control module (801) is connected with the input end of multiple pump laser source (701), the input end of described multiple pump laser source (701) is connected with the input end of polarized wave combiner (601), the output terminal of described polarized wave combiner (601) is connected with the input end of the second coupling mechanism (501).
2. the telluro optical fiber Raman amplification controller of flat gain according to claim 1, is characterized in that: described control module (801) is by for carrying out the Raman gain counting circuit (8011) of signals collecting, for more last time forming with the decision circuit (8012) of this gain change amount with for the control circuit (8013) of Pumping parameters being made to control to flashlight before and after transmission.
3. the telluro optical fiber Raman amplification controller of flat gain according to claim 1, is characterized in that: in described multiplexed signals light, the centre wavelength of any one wavelength and described each pump laser source (701) meets Δ v=(1/ λ pj)-(1/ λ si), wherein, Δ v is frequency shift amount, and the value of Δ v is 700cm -1～786cm -1.
4. the telluro optical fiber Raman amplification controller of flat gain according to claim 1, is characterized in that: the Raman gain spectrum of described telluro highly nonlinear optical fiber (401) is at 700cm -1～786cm -1frequency swing in, corresponding graceful gain coefficient scope is 2.97 × 10 -12m/W～3.98 × 10 -12m/W.
CN201420009233.3U 2014-01-07 2014-01-07 Tellurite-based optical fiber Raman amplification controller with flat gain Expired - Fee Related CN203673196U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106785841A (en) * 2016-12-26 2017-05-31 华南理工大学 A kind of optical fiber Raman amplifier of FPGA time-sharing multiplexs pumping schemes
CN110945801A (en) * 2018-03-09 2020-03-31 华为技术有限公司 Optical fiber amplifier and gain adjusting method of optical fiber amplifier

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106785841A (en) * 2016-12-26 2017-05-31 华南理工大学 A kind of optical fiber Raman amplifier of FPGA time-sharing multiplexs pumping schemes
CN110945801A (en) * 2018-03-09 2020-03-31 华为技术有限公司 Optical fiber amplifier and gain adjusting method of optical fiber amplifier
US11128384B2 (en) 2018-03-09 2021-09-21 Huawei Technologies Co., Ltd. Fiber amplifier and gain adjustment method for fiber amplifier
CN110945801B (en) * 2018-03-09 2021-11-19 华为技术有限公司 Optical fiber amplifier and gain adjusting method of optical fiber amplifier
US11671179B2 (en) 2018-03-09 2023-06-06 Huawei Technologies Co., Ltd. Fiber amplifier and gain adjustment method for fiber amplifier

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20140625

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