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Pumping-balanced L-band fiber amplifier

一种光纤放大器、泵浦激光器的技术，应用在光通信领域，能够解决L-band光纤放大器制作成本高、转换效率低、噪声指数大等问题，达到降低非线性四波混频效应、提高泵浦转换效率、降低噪声指数的效果

Inactive Publication Date: 2019-03-15
GUANGXUN SCI & TECH WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The length of the erbium-doped fiber of the L-band fiber amplifier is relatively long, and the direct use of the traditional C-band optical path structure in the L-band amplifier may cause problems such as large noise index, low conversion efficiency, and serious nonlinear four-wave mixing in the fiber. , and the production cost of L-band fiber amplifier is relatively high

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0044] Embodiments of the present invention provide a balanced pumped L-band fiber amplifier, such as Figure 3-Figure 5 As shown, it includes a first erbium-doped fiber 1-1, a second erbium-doped fiber 1-2, an absorbing erbium-doped fiber 1-3 and at least two pump lasers, the first erbium-doped fiber 1-1, the second The erbium-doped fiber 1-2 and the absorbing erbium-doped fiber 1-3 are set successively, and the at least two pump lasers are used to provide pumping light; wherein, the first erbium-doped fiber 1-1 is covered by at least two of them The pump lasers inject forward pump light and backward pump light, and the second erbium-doped fiber 1-2 is also injected with forward pump light and backward pump light by at least two of the pump lasers. Compared with the existing double forward pumping, the present invention adds backward pumping, so that both sections of erbium-doped optical fiber become bidirectional pumping, and at the same time, a section is added downstream o...

Embodiment 2

[0055] The specific structure of the fixed-gain L-band amplifier FGA is introduced in the above-mentioned embodiment 1. On the basis of the embodiment 1, the embodiment of the present invention will introduce the specific structure of the variable-gain L-band amplifier VGA. The main difference from FGA is that a variable optical attenuator (Variable optical attenuator, abbreviated as VOA) is added to VGA. Because the insertion loss of VOA is relatively large, and the loss of gain flattening filter at certain wavelength points is relatively large, If the two devices are placed together, the noise figure will be greatly affected, so the two devices need to be separated into different sections of erbium-doped optical fiber. Therefore, the VGA structure will have one more section of erbium-doped fiber than the FGA structure, and the extra section of fiber is recorded as the third erbium-doped fiber 1-4. Bidirectional pumping can also be forward pumped, while the first and last erb...

Embodiment 3

[0065] In order to better verify the overall performance of the optical fiber amplifier provided by this solution, the embodiment of the present invention has carried out comparative experiments on a variety of different pumping methods. Specifically, taking the FGA provided in Example 1 as an example, the optical path contains two sections that require The erbium-doped fiber injected with pump light, under the condition of the same gain and output power, studied the relationship between the noise figure and the pumping method, and the relationship between the nonlinear four-wave mixing effect and the pumping method. The research results show that, When the two sections of erbium-doped fiber are bidirectionally pumped and an absorbing erbium-doped fiber is added, the overall performance of the fiber amplifier is optimal. The specific experimental results are as follows:

[0066] Figure 6 When the FGA gain and output power are the same, the curves of noise index changes corre...

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Abstract

The invention relates to the field of optical communication, in particular to a pumping-balanced L-band fiber amplifier. The pumping-balanced L-band fiber amplifier comprises a first erbium-doping fiber, a second erbium-doping fiber, an absorption erbium-doping fiber and at least two pumping lasers, wherein the first erbium-doping fiber, the second erbium-doping fiber and the absorption erbium-doping fiber are sequentially arranged in a forward-backward way, the at least two pumping lasers are used for providing pumping light, forward pumping light and backward pumping light are injected to both of the first erbium-doping fiber and the second erbium-doping fiber, and the absorption erbium-doping fiber is arranged at a downstream of the second erbium-doping fiber and is used for absorbing ASE in the amplifier. Bidirectional pumping is performed on a first segment of erbium-doping fiber and the last segment of erbium-doping fiber in an optical path, the segment of erbium-doping fiber which is not subject to pumping injection is additionally arranged and is used for absorbing the ASE, the pumping conversion efficiency is greatly improved, the non-linear effect is reduced, meanwhile, the problem of large noise due to the adoption of backward pumping by the L-band fiber amplifier is also solved, the noise index is reduced, and the cost is reduced.

Description

【Technical field】 [0001] The invention relates to the field of optical communication, in particular to a balanced pumped L-band optical fiber amplifier. 【Background technique】 [0002] With the introduction of the concept of "Internet +", the development of 5G, cloud computing, big data, and the Internet of Things has put forward higher requirements for the bandwidth and speed of existing communication networks. 100Gbit / s systems are mainstream equipment, and 200Gbit / s and 400Gbit / s systems are already in the trial stage. For systems beyond 100G, dual-carrier or multi-carrier schemes are often used, and the modulation format also adopts 8QAM or 16QAM. The spectrum utilization rate is not high, and the traditional C-band (1528-1568nm) channel can no longer meet the bandwidth requirements. The system uses L-band signals (1570-1610nm) The demand is more and more urgent. [0003] In fiber amplifiers, it is generally realized through the optical path structure of two or three o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/067H01S3/094
CPCH01S3/06716H01S3/06754H01S3/094003H01S3/0677H01S3/094011H01S3/094096H01S3/06758H01S2301/02H01S2301/03H01S3/1608H01S2301/04H01S3/094061Y02D30/70H01S3/06787
Inventor 付成鹏余振宇刘青乐孟辉余春平
Owner GUANGXUN SCI & TECH WUHAN
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