通常ＣＤＭＡ系统接近波分复用的性能，但是也面临一些有待解决的问题，例如多用户时的谱干扰、散弹噪声等。文中提出了一种实现光ＣＤＭＡ的新方案，它应用平衡发射和接收技术，同时使用Ｍａｃｈ－Ｚｅｈｎｄｅｒ干涉链来进行地址编码。按新方案实施可以在非相干调制光系统中得到地址码的真正正交，从而改善系统的性能 CDMA systems are usually close to the performance of WDM, but also face some problems to be solved, such as spectral interference when users, shot noise and so on. In this paper, a new scheme for implementing optical CDMA is proposed, which uses balanced transmit and receive techniques while using Mach-Zehnder interference chains for address coding. According to the new scheme can get the real orthogonal code address in incoherent modulation optical system, thereby improving the performance of the system