关键词: 光通信, SCM/WDM光纤通信系统, 抑制载波的光学单边带调制, 群速度色散, 非线性效应

Abstract:

In order to suppress GVD and nonlinear interference on SCM/WDM optical fiber communication systems, a kind of facile carrier-suppressed optical single-side-band(SSB) modulation is used. The carrier-suppressed optical single-side-band modulation signals have a large modulation depth which can suppress nonlinear effect in optical fiber and eliminate intermodulation distortion which comes from nonlinear modulation characteristic of optoelectronic modulators simultaneously. It is clearly that the detected spectrum of the modulated signal only has one sideband which can effectively reduce the band width of the light signal and then significantly decrease dispersion penalty and increase the optical bandwidth efficiency. It can be seen form the measured receiver sensitivity map that using carrier-suppressed optical single-side-band modulation technique can effectively improve the receiver sensitivity of 3-5dB.

Key words: optical communication, SCM/WDM optical fiber communication systems, carrier-suppressed optical single-side-band modulation, group velocity dispersion, nonlinear effects