首页>
外国专利>
Raman amplified optical system with reduction of four-wave mixing effects
Raman amplified optical system with reduction of four-wave mixing effects
展开▼
机译:拉曼放大光学系统,减少四波混频效应
展开▼
页面导航
摘要
著录项
相似文献
摘要
A transmission fiber for use in a Raman amplified optical communication system is formed to exhibit certain characteristics that limit modulation instability and four-wave mixing in the amplification region, thus reducing the noise component present in the transmission system. In particular, the group-velocity dispersion (denoted as D and measured in terms of ps/nm-km) is restricted to be either non-positive or greater than +1.5 ps/nm-km in the pump wavelength range of interest (a typical pump wavelength range being 1430-1465 nm). Preferably, the magnitude of the dispersion is kept below a value of 10 ps/nm-km in the signal wavelength range of interest (e.g., the “C” band or “L” band). Four-wave mixing is reduced by ensuring that the zero-dispersion frequency of the transmission fiber is not centered between the pump frequency and a frequency experiencing Raman gain.
展开▼