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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 .
This paper discusses the problem of OBI noise in the case of multiple optical carrier access in subcarrier multiplexing system and analyzes the mechanism of generation, the power spectrum distribution and the carrier-to-interference ratio of the optical beat frequency interference. Noise greatly reduces the single-channel carrier-to-noise ratio, seriously degrading the performance of the system and therefore must be suppressed.Improvement of the spectral width of the laser light source and the reduction of the signal bandwidth can effectively improve the carrier to noise ratio.