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.

• 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 .