Design of pump power spectra for the fiber Raman amplifier using incoherent pumping

• Main Author: 陳俊嘉
• Other Authors: 溫盛發
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/18278208941805687405

碩士 === 中華大學 === 電機工程學系(所) === 94 === The method to design the incoherent pump power spectrum with pre-assigned extremum pump wavelength for the distributed fiber Raman amplifier (DFRA) is presented. Two 100-km TWReach DFRAs using backward pumping and bidirectional pumping respectively are taken as examples, in which the gain ripple is less than 0.1 dB over 70-nm bandwidth. For the DFRA using backward pumping, the use of shorter extremum pump wavelength results in lower effective noise figure but larger pump power. For the DFRA using bidirectional pumping, the extremum wavelength is set to the co-pump. The optimized spectrum of counter-pump has the double-lobe structure. It is found that the effective noise figure is the minimum for the case using the extremum pump wavelength that has the maximum Raman gain for the wavelength of the short-wavelength lobe of the counterpump.