Optimal design scheme for multiwavelength backward-pumped Raman amplifiers

Chengxia Li; Dawei Fang; Zaixuan Zhang; Tao Liu; Jianfeng Wang

doi:10.1117/12.522149

12 May 2004 Optimal design scheme for multiwavelength backward-pumped Raman amplifiers

Chengxia Li, Dawei Fang, Zaixuan Zhang, Tao Liu, Jianfeng Wang

Proceedings Volume 5280, Materials, Active Devices, and Optical Amplifiers; (2004) https://doi.org/10.1117/12.522149
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China

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.

Citation Download Citation

Chengxia Li, Dawei Fang, Zaixuan Zhang, Tao Liu, and Jianfeng Wang "Optimal design scheme for multiwavelength backward-pumped Raman amplifiers", Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004); https://doi.org/10.1117/12.522149

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KEYWORDS

Raman spectroscopy

Optical amplifiers

Bromine

Fiber amplifiers

Amplifiers

Single mode fibers

High power fiber amplifiers

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