Suppression of Transient Gain Response in Bi-Directionally Pumped Raman Amplifiers

Author

Huang Liqun ; Yang Guang ; Song Xin

Author_Institution

Dept. of Electron. Inf., Northeastern Univ. at Qinhuangdao, Qinhuangdao, China

fYear

2010

fDate

19-21 June 2010

Firstpage

1

Lastpage

3

Abstract

In this paper, transient gain response in Raman fiber amplifiers (RFA) was simulated in details using an accurate dynamic numerical model. Firstly, bi-directionally pumped RFAs were designed for 80nm gain bandwidth, and less than 0.6 dB flatness of both gain and OSNR were derived by optimizing pump wavelengths and pump powers. When 50 channels were dropped from total 100 channels, Raman gain fluctuations on the surviving channels ranged from 1.1 to 1.2 dB. Then, backward pump powers were adjusted automatically to suppress inter-channel cross gain modulation by using PID negative feedback control, the maximum fluctuation of output-signal power was less than 0.16 dB on all surviving channels.

Keywords

Raman lasers; laser feedback; optical fibre amplifiers; optical pumping; optical variables control; three-term control; PID negative feedback control; Raman fiber amplifier; bidirectionally pumped Raman amplifiers; dynamic numerical model; interchannel cross gain modulation suppression; transient gain response suppression; Bandwidth; Bidirectional control; Design optimization; Fluctuations; Negative feedback; Numerical models; Optical noise; Signal to noise ratio; Stimulated emission; Three-term control;

fLanguage

English

Publisher

ieee

Conference_Titel

Photonics and Optoelectronic (SOPO), 2010 Symposium on

Conference_Location

Chengdu

Print_ISBN

978-1-4244-4963-7

Electronic_ISBN

978-1-4244-4964-4

Type

conf

DOI

10.1109/SOPO.2010.5504115

Filename

5504115