为消除光时分/码分多址等光数字通信系统中的多址干扰(MAI)噪声，提出了一种新型的基于分布反馈式(DFB)激光器腔内的交叉增益调制(XGM)效应全光阈值判决技术。通过将光数字脉冲信号注入DFB激光器，激光器内部出现XGM效应，使用光带通滤波器(OBPF)滤出XGM效应产生的新光谱即可消除信号中的MAI噪声，从而提高数字信号的接收性能。

To eliminate multiple access interference(MAI) noise in optical time division/code division multiple access igital communication systems, a novel all-optical threshold decision technique based on cross gain modulation(XGM) effect in distributed feedback(DFB) lasers cavity is proposed. By injecting optical digital pulse signal into DFB laser, XGM effect appears inside the laser. Using optical bandpass filter(OBPF) to filter out the new spectrum produced by XGM effect can eliminate MAI noise in the signal, thus improving the reception performance of digital signal.