二维同步OCDMA光编码器设计与研究

Design and study of 2-D optical encoder for synchronous OCDMA systems

文章以"同步修正素数码"为基础,利用互相垂直的两组线偏振光构造了适用于同步光码分多址(OCDMA)系统的二维光正交地址码。通过分析码字的自相关和互相关特性,确定了其选码原则。在此基础上,设计了适用于同步OCDMA系统的二维光编码器。仿真结果表明,与一维同步OCDMA系统相比,二维同步光正交地址码具有更优良的接收性能,并解决了器件在实际使用过程中可能出现的功率非线性叠加问题。

A new family of two-dimensional（2-D） optical orthogonal address code is constructed by using two orthogonal linear polarization lights on the basis of the synchronous modified prime code for synchronous optical CDMA systems.Its choice principle is determined by analyzing the auto-correlation and cross-correlation of 2-D codes,on the basis of which a 2-D optical encoder appropriate for synchronous OCDMA systems is designed.Simulation results prove that the 2-D optical orthogonal address code has still better receiver properties compared with that for the one-dimensional synchronous OCDMA system and resolves the problem of nonlinear addition of power that may occur in practical encoder usage.