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Proceedings Paper

Optimal design scheme for multiwavelength backward-pumped Raman amplifiers
Author(s): Chengxia Li; Dawei Fang; Zaixuan Zhang; Tao Liu; Jianfeng Wang
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Paper Abstract

A new and practically applicable scheme of optimally configuring backward multiple pumps in optical fiber Raman amplifiers is presented based on the characteristics of Raman gain spectra and the fact that different pump powers and wavelengths have different impact on the gain slope by using Optiamplifier 4.0 simulating software, which is made in Optiwave Corporation, Canada. We use the idea to optimize a distributed Raman amplifier pumped by 2-walvelength sources. The optimized design contained signal channels between 1490 and 1530 nm with 4-nm separations. The fiber used as the gain medium was a 50-km single-mode fiber (SMF) with 9.9e-14m/W peak Raman-gain coefficient. After calculating 11 times optimum pump wavelengths 1390nm, 1427nm are obtained. The achieved gain flatness is 1.46dB and the maximum forward on/off gain is 10.43 dB, which is much better than initial un-optimized gain flatness 5 dB. Then after 24 calculations we get the optimum pump powers. The final optimized pump sources are 1390nm 300mW, 1427nm 290mw. Gain ripple less than 1.2 dB in 40nm and maximum Raman on/off gain about 10.1 dB are obtained. Finally the factors of the noise figure are analyzed and ASE is found to be the main noise source.

Paper Details

Date Published: 12 May 2004
PDF: 4 pages
Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004);
Show Author Affiliations
Chengxia Li, China Institute of Metrology (China)
Dawei Fang, China Institute of Metrology (China)
Zaixuan Zhang, China Institute of Metrology (China)
Tao Liu, China Institute of Metrology (China)
Jianfeng Wang, China Institute of Metrology (China)

Published in SPIE Proceedings Vol. 5280:
Materials, Active Devices, and Optical Amplifiers
Connie J. Chang-Hasnain; Dexiu Huang; Yoshiaki Nakano; Xiaomin Ren, Editor(s)

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