OCDMA系统中二维光正交码ESPC/MOLS的设计及性能分析  

Design and performance Analysis of Two-Dimensional optical orthogonal codes in OCDMA systems

作　　者：周慧丽 李传起 陆叶[1] 刘勇志 周鹏 高凡 李明扬 ZHOU Huili;LI Chuanqi;LU Ye;LIU Yongzhi;ZHOU Peng;GAO Fan;LI Mingyang(Lab of Optoelectronics and Optical Communications, College of Electronic Engineering, Guangxi Normcil University, Guilin 541004,China;College of Physics and Electronic Engineering, Nanning Normal University, Nanning 530001 ,China;GUANGXI RADIO & TV NETWORK Corporation Nanning Branch ,Nanning 530023,China)

机构地区：[1]广西师范大学电子工程学院光电子与光通信实验室,桂林541004 [2]南宁师范大学物理与电子工程学院,南宁530001 [3]广西广播电视信息网络股份有限公司南宁分公司,南宁530023

出　　处：《激光杂志》2019年第4期87-91,共5页Laser Journal

基　　金：桂攻科(No.AB17292082)

摘　　要：以两两正交拉丁方阵序列(MOLS)为波长跳频序列,以扩展二次素数码(ESPC)为扩时序列,构造了一种适用于光码分多址(OCDMA)系统的新的二维光正交码(2D-OOC)-ESPC/MOLS。分析了不同阶波长数(素数幂阶和奇数阶)下的码字性能,且与OPC/OCS等类似2D-OOC相比,相同码重和波长数情况下,该码的码字容量较大,误码率始终比OPC/OCS低四个数量级。OCDMA双用户传输系统仿真结果表明,当系统传输速率为30 Gbits/s时,该码误码率低至10^(-11),且此时能得到比采用ESPC/OCS系统更理想的眼图。故ESPC/MOLS比其他类似2D-OOC更适合在OCDMA系统中传输。A new two-dimensional optical orthogonal code (2D-OOC )-ESPC/MOLS for opteal code division multiple access ( OCDMA) systems was designed by using Mutually Orthogo-nal Latin Square ( MOLS) as wavelength hopping sequence and Extended Square Prime C-ode ( ESPC) as time spreading sequence. The code performance with different order wav-elength numbers ( prime power and odd order) had been analyzed. The code capacity of ESPC/ MOLS is larger compared with similar 2D-OOC such as OPC/OCS under the same c-ode weight and number of wave-lengths, and the BER can always be four orders of magn-itude lower than OPC/OCS. Simulation results of the OCDMA dual-user transmission syst-em show the BER of this code is as low as 10^-11 when the transmission rate of the sys-tem is 30Gbits/s, better eye diagrams than the system using ESPC/OCS could be received. Therefore this code -word is more suitable for transmission than other similar 2D-OOC in OCDMA system at this time.

关 键 词：正交拉丁方 扩展二次素数码 光码分多址 二维光正交码 

分 类 号：TN249[电子电信—物理电子学]