多光载波接入副载波复用系统中的光拍频干扰噪声分析

Analysis of Optical Beat Interference Noise in Subcarrier Multiplexing System with Multiple Optical Carriers

讨论了副载波复用系统中多光载波接入情况下的光拍频干扰 (OBI)噪声问题 ,对光拍频干扰的产生机理、功率谱分布和载波干扰比进行了分析 .光拍频干扰噪声大大地降低了单信道的载噪比 ,严重地劣化了系统的性能 ,因而必须加以抑制 .增加激光光源谱宽和减少信号带宽可以有效地提高载噪比 .

Optical beat interference (OBI) noise in a subcarrier multiplexing system with multiple optical carriers is discussed. The mechanism of OBI, its spectrum distribution and carrier-to- interference ratio are analyzed. OBI noise drastically reduces CNR of each channel and seriously degrades the system performance, therefore must be suppressed. Increasing spectrum linewidths of laser sources and reducing bandwidths of signals can enhance CNR effectively.