基于光子晶体波导的光码分多址编解码实现研究  

The Research on OCDMA Encoder/Decoder Based on Photonic Crystal Waveguides

作　　者：李传起[1,2] 陈晖[2] 周谞[2] 赵立龙[2] 宋标[2] 孙婷婷[2] 

机构地区：[1]广西师范大学电子工程学院,广西桂林541004 [2]南京信息工程大学数理学院,江苏南京210044

出　　处：《光学学报》2010年第10期2879-2883,共5页Acta Optica Sinica

基　　金：江苏省高校自然科学基金面上项目(BK2008437);江苏省自然科学基金面上项目(07KJB510066);南京信息工程大学科研基金(20080287)资助课题

摘　　要：讨论了一种新型光功能器件——光子晶体滤波器的工作机理,以带阻和带通滤波器构造多信道光子晶体滤波器,提出了能够用于光码分多址(OCDMA)系统编解码的基本原理。根据耦合模理论,缺陷谐振腔把光信号分成多个码片,完成对用户信号的频域编码。设计出中心波长分别为1527.70,1551.10和1570.00 nm的三通道滤波器作为OCDMA波导编解码器。为了保证码片的透射比,在主波导侧面附加缺陷介质构成带阻滤波器,使第二个码片透射比达到95%。谱宽为0.3 nm,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。该器件在整个编码过程中损耗的能量极少,这对于实现远距离通信很重要。The mechanism of a new optical function device——photonic crystal（PC） filter is discussed.Subsequently,the basic theory for encoder/decoder in optical code division multiple access（OCDMA） system based on multiple channel PC filter consisting of band-pass filter and band-stop filter is proposed.Light signals are divided into several chips by the defect resonate cavity to encode/decode the user signals in frequency domain,according to the coupled-mode theory.Thus,the decoder in 2D-OCDMA can be performed.A waveguide decoder/encoder in OCDMA system consisting of three-channel photonic crystal filter,whose wavelength centered at 1527.70,1551.10,1570.00 nm is designed.To elevate the transmission efficiency,an extra defect is attached in at the sideway of the bus waveguide.As a results,the efficiency of the second chip is up to 95%.In emulation,the full width at half maximum is 0.3 nm,so there won′t be interference between signals in each channel.Also,energy loss in the process of decoding/encoding by PC waveguide encoder/decoder is small,which plays an important part in remote communication.

关 键 词：光通信 光子晶体 光码分多址编解码器 光子晶体滤波器 缺陷模 

分 类 号：TN929.11[电子电信—通信与信息系统]