title: Experimental study on the effect of codirectional Raman gain on system's performance.
abstract: We have experimentally investigated the impact of codirectional Raman gains on the performance of distributed fiber Raman amplified systems. The effects of various noise sources, such as optical signal-to-noise ratio (OSNR) degradation, fiber nonlinearities and surviving channel gain variation in different Raman pumping schemes, were evaluated as a function of input power into a fiber span. For measurements, distributed Raman gain was generated by pumping the fiber span with different combinations of Raman pump power between co- and counterdirections. From the results, we found that a large counterdirectional Raman gain assisted by a small codirectional gain could improve the overall static and dynamic performance of distributed Raman amplified systems.
authors: School of Electrical and Computer Engineering, University of Seoul 13 Siripdae-gil, Dongdaemun-gu, Seoul 130-743, Korea. chkim@uos.ac.kr
authors: Chul Han
authors: CH
authors: Kim
authors: Eui Seung
authors: ES
authors: Son
authors: Ho-Shin
authors: HS
authors: Cho
authors: Young-Geun
authors: YG
authors: Han
authors: Ju Han
authors: JH
authors: Lee
authors: Sang Bae
authors: SB
authors: Lee