光学学报, 2010, 30 (s1): s100204, 网络出版: 2010-12-08  

基于光子晶体的二维光码分多址编解码实现研究

Research on 2D-OCDMA Encoder/Decoder Based on Photonic Crystal
作者单位
1 南京信息工程大学数理学院, 江苏 南京 210044
2 广西师范大学电子工程学院, 广西 桂林 541004
摘要
以光子晶体缺陷模理论和慢光效应为基础,提出了一种基于光子晶体的多通道滤波器结构用于二维光码分多址(2D-OCDMA)系统编解码的方案,并分析其编码性能。根据耦合模理论,通过缺陷谐振腔的滤波作用,用户光信号按地址码序列切割成多个脉冲序列,完成对用户信号的谱域编码。由于光子晶体波导的慢光效应,微米量级编码器结构的时延可以达到纳米量级,达到正确编解码的标准。设计的2D-OCDMA三码片编码器中心波长分别为1545.00,1555.30和1570.60 nm,缺陷间隔时延为0.4 ns。由于透射谱几乎不存在旁瓣,所以解码时信号基本上不会出现干扰,保证了用户发送和接收信号的准确性。
Abstract
Based on defect mode theory and slow light effects, a new scheme of encoder/decoder in 2D-opticalcode division multiple acess (2D-OCDMA) which uses multi-channel photonic crystal (PC) filter is proposed. According to couple-mode theory, user signals were cut into several pulses in accordance with the address code sequence due to the defect resonator. Then, the frequency encoded of user signal in 2D-OCDMA can be performed. Because of the slow light effects of PC waveguide,the time delay of the structure in micron magnitude is up to nanometer magnitude, which comes up to the standard of correct encoding and decoding. The centre wavelength of the three-channel encoder of 2D-OCDMA are 1545.00, 1555.30 and 1570.60 nm respectively, and the time delay between dot defects is 0.4 ns. Without sidelobe in the transmission spectrum, there is no interference in decoding, which ensures the accuracy in the process of encoding and decoding.

陈晖, 李传起, 周燕燕, 孙婷婷, 宋标, 申志国. 基于光子晶体的二维光码分多址编解码实现研究[J]. 光学学报, 2010, 30(s1): s100204. Chen Hui, Li Chuanqi, Zhou Yanyan, Sun Tingting, Song Biao, Shen Zhiguo. Research on 2D-OCDMA Encoder/Decoder Based on Photonic Crystal[J]. Acta Optica Sinica, 2010, 30(s1): s100204.

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