Chinese Optics Letters, 2005, 3 (6): 06311, Published Online: Jun. 6, 2006
High gain low noise L-band preamplifier with cascade double-pass structure 
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060.2320 fiber optics amplifiers and oscillators 060.2410 fibers erbium 060.4510 optical communications
Abstract
An optimized two-stage-cascade double-pass structure L-band preamplifier was proposed and experimentally studied to overcome the shortcomings of low gain coefficient and high noise figure of L-band erbium-doped fiber amplifier (EDFA). The fiber lengthes of 6.5 and 32.5 m, pump powers of 130 and 119 mW for the first and second stages respectively are used in the experiment. When input signal power is -30 dBm, the amplifier can provide gain above 38.84 dB in a wavelength range of 34 nm (1568---1602 nm), gain ripple less than 2.04 dB (40.88---38.84 dB), and noise figures lower than 5.29 dB with the lowest value of 3.95 dB at 1590 nm. Experimental and simulation results show that this low cost and high pump efficiency amplifier is suitable for the application as an L-band preamplifier in the broadband fiber communication system.
Dongfang Jia, Yanyong Wang, Huanmin Bao, Tianxin Yang, Shichen Li. High gain low noise L-band preamplifier with cascade double-pass structure[J]. Chinese Optics Letters, 2005, 3(6): 06311.
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