Optical Code Division Multiplexing (ocdma) System, Inter-symbol Interference

Optical code division multiplexing Access (OCDM) is one of the possible resolutions for future all optical communication networks.Compared with other multiplexing technologies, it is still at the state of infancy.This thesis is focused on multiple access interrupt(MAI), dispersion and nonlinear effect and effect of source extinction ratio in time domain amplitude code optical CDMA system and frequency-hopping/time-spreading optical CDMA system., and some solution The history of OCDMA technology is reviewed and the obstacle in OCDMA is analyzed, and the basical principle, system schemes, the key technologies are introduced. Combining with other multiplexing technologies and using fiber gratings as the encoder/decoder are the trends in OCDMA system.In time domain amplitude code optical CDMA system, MAI and dispersion and nonlinear effect are analysed, the schemes of using optical hard limter and using sigle mode fiber add dispersion compensate fiber are proposed to enhance system performance. In frequency-hopping/time-spreading optical CDMA system, MAI, group velocity mismatch effect and effect of source extinction ratio are analyzed, the schemes of using double optical hard limters and using dispersion shift fiber to enhance system performance.