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Optical fiber amplifier

A fiber amplifier, doped fiber technology, applied in the field of optical communication, can solve the problems of unbalanced gain, inconsistent mode signal transmission performance, large difference, etc. Effect

Active Publication Date: 2020-05-29
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the above-mentioned multi-channel single-mode EDFA, FM-EDFA has a lower cost, but the gain of each mode is unbalanced, the mode gain difference (Differential Mode Gain, DMG) is large, and the amplification noise figure (Noise Figure, NF) are quite different, resulting in inconsistent transmission performance of signals in each mode, which is not conducive to long-distance transmission

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Embodiment Construction

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0037] Embodiments of the present invention provide a strong coupling space division multiplexing optical fiber amplifier, such as figure 2 As shown, it includes: two optical isolators 201 , a pump laser 202 , a signal pump beam combiner 203 , and a few-mode doped fiber 204 . Wherein, two optical isolators 201 are respectively at the input end and the output end of the optical fiber amplifier, and are used to prevent backscattered light from entering the optical fiber link and affecting the quality of optical signal transmission; the pumping laser 202 is used to output pumping light; the signal pumping The beam combiner 203 is used to couple the few-mode signal light and pump light at the input end to the output end; the few-mode dope...

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Abstract

The invention provides an optical fiber amplifier. The optical fiber amplifier comprises a pump laser, a signal pump beam combiner and a few-mode doped optical fiber, wherein the pump laser is used for outputting pump light; the signal pump beam combiner is used for coupling input few-mode signal light and pump light into the few-mode doped optical fiber; and a refractive index of a fiber core ofthe few-mode doped fiber is gradually changed along a radius direction of a cross section, a periodic grating is engraved on the fiber core along an axial direction, and a period of the grating meetsa phase matching condition. According to the optical fiber amplifier, strong coupling and co-amplification among optical signal modes are realized so that a differential gain among mode groups is reduced.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an optical fiber amplifier. Background technique [0002] With the rapid growth of the communication capacity demand, a spatial division multiplexing (Spatial Division Multiplexing, SDM) technology based on few-mode fiber (Few Mode Fiber, FMF) and multi-core fiber (Multi-core Fiber, MCF) appeared, using SDM In the long-distance transmission system of advanced technology, the SDM optical fiber amplifier is required to realize the simultaneous amplification of different spatial channels. [0003] Such as figure 1 As shown, it is a scheme to realize simultaneous amplification of different spatial channels in few-mode optical transmission. It is realized by using multiple single-mode Erbium-Doped Fiber Amplifiers (EDFA). Specifically, the mode-multiplexed signal input by the few-mode optical fiber is firstly demultiplexed into multiple single-mode signals, and then respectivel...

Claims

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Application Information

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IPC IPC(8): H01S3/067H01S3/091H01S3/16H01S3/00
CPCH01S3/06754H01S3/0675H01S3/06716H01S3/1603H01S3/1601H01S3/06708H01S3/091H01S3/0064H01S3/0804H01S3/06733H01S3/06729H01S3/094015H01S3/176H01S3/1695H01S3/06737H01S2301/04H01S3/094007H01S3/10023H01S3/1302
Inventor 张林刘亚平杨志群郭强周锐
Owner HUAWEI TECH CO LTD