Wavelength Channel Bandwidth of Wavelength-Selective Devices

作     者：XIAO Yan ping, WU Ya ming School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China 

作者机构：School of Communication and Information Engineering Shanghai University Shanghai China 

出 版 物：《Journal of Shanghai University(English Edition)》 (上海大学学报（英文版）)

年 卷 期：2001年第5卷第1期

页      面：48-52页

学科分类：0810[工学-信息与通信工程] 08[工学] 081001[工学-通信与信息系统] 

基　　金：theNationalNaturalScienceFoundationofChina!(6 97770 14 ) theQimingxingProjectofShanghaiMunicipalCommissionofScienceandTec 

主　　题：wavelength channel bandwidth wavelength selective device(WSD) differential time delay 

摘      要：Narrow bandwidth is a crucial factor in a high performance wavelength selective device(WSD). There are many different expressions to estimate bandwidths of many different WSDs. In this paper, we derive an important rule that the differential time delay between two coupling modes is the most important factor deciding the wavelength channel bandwidth for several different WSDs. This rule reveals that larger differential time delay between two coupling modes results in higher discrimination level of the operating wavelength. Based on the rule, a novel design of wavelength selective coupler that has a bandwidth narrower than normal couplers is presented.