Polarization Dependent Gain Stability of Raman Amplification Single-Core Feedback Structure Based on Consistency of Long-Axis Azimuths Variation

被引：0

作者：

Yu, Fengzhen ^{[1
]}

Ma, Yixiao ^{[1
]}

Jia, Kun ^{[1
]}

Lai, Xin ^{[1
]}

Xiao, Qian ^{[1
]}

Jia, Bo

机构：

[1] Fudan Univ, Fiber Opt Res Ctr, Dept Mat Sci, Shanghai 200433, Peoples R China

来源：

PHOTONICS | 2023年 / 10卷 / 12期

关键词：

Raman fiber amplifier; single-core feedback structure; polarization; Faraday rotating mirror; LASER; AMPLIFIERS; SENSOR;

D O I：

10.3390/photonics10121294

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

The law of the polarization state of Raman fiber amplifier switch in single-core feedback structures is unknown. In this paper, two kinds of optical paths with single-core feedback structures are constructed, namely the Raman amplified Faraday rotating mirror single-core feedback structure (RFA-FRMOP) and the Raman amplified ordinary flat mirror single-core feedback structure (RFA-RMOP). In the process of optical signal amplification involving Raman fiber amplifiers, the polarization dependent gain (PDG) generated by Raman switches is affected by the polarization state, and RFA-FRMOP shows better stability. Surprisingly, polarization analysis of the RFA-FRMOP structure shows that both the ellipticity angle and the long-axis azimuth of the output feedback structure changed less than that of the signal entering the feedback structure. The consistency of the long-axis azimuth variation is the main characteristic of the RFA-FRMOP structure. It is found that the variation of the azimuth of the long axis of the RFA-FRMOP structure is obviously greater than that of the ellipticity. These conclusions provide a theoretical basis for the polarization dependent application of Raman fiber amplifiers in single-core feedback structures.

引用

页数：12