In order to suppress group velocity dispersion (GVD) and nonlinear interference on SCM/WDM optical fiber communication systems, a kind of facile carrier-suppressed optical single-side-band(SSB) modulation was presented. The carrier-suppressed optical SSB modulation signals have a large modulation depth which can suppress nonlinear effect in optical fiber and eliminate intermodulation distortion which comes from nonlinear modulation characteristics of optoelectronic modulators simultaneously. It is clear 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 from the measured receiver sensitivity map that using carrier-suppressed optical SSB modulation technique the receiver sensitivity can be improved effectively to 3～5 dB.