Optimal design of fiber Raman amplifiers in Nonzero Dispersion Shifted Fiber for WDM systems

• Main Authors: Ren-He Juo, 卓仁和
• Other Authors: Jeng-Cherng Dung
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/97079174138369455086

碩士 === 國立東華大學 === 電機工程學系 === 96 === Nonzero dispersion shifted fibers (NZDSF) are often used to reduce the four-wave mixing (FWM) that impacts on the performance of transmission system. So, fiber Raman amplifier （FRA）based on 100km NZDSF for metropolitan area networks (MANs) is popular in recent years. Besides, as bit rates in lightwave systems increased to 10Gb/s or higher, dispersion-compensated fiber (DCF) becomes very important in compensating the accumulated dispersion of the transmission fiber. In systems with all-Raman amplification, the DCF can act as the compensator of dispersion and attenuation simultaneously. In this thesis, we setup the experimental configurations of single-stage and multistage FRA with different pump schemes. When input signal power is -20dBm the results show that the best on-off gain and noise figure are 23.22dB and 6.95dB for bidirectional pump scheme and forward pump scheme, respectively. The forward pump scheme has much better performance. Since we have to consider the accumulate dispersion of the high bit rates transmission systems, we add the DCF to NZDSF-based FRA. However, due to serious Brillouin Scattering for forward pump scheme, the performance of forward pump scheme can not be measured. When input signal power is -20dBm, the results show that the best on-off gain and noise figure are 27.52dB and 7.5dB for backward pump scheme and forward-forward pump scheme. Therefore, the forward-forward pump scheme has the best performance.