基于双通构型的和频、差频可变波长路由方案及其应用  

A tunable wavelength routing scheme based on the sum-and difference-frequency generation with doublepass configuration and its applications

作　　者：喻松[1] 张华[1] 申静[1] 张永军[1] 顾畹仪[1] 

机构地区：[1]北京邮电大学,光通信与光波技术教育部重点实验室,北京100876

出　　处：《物理学报》2008年第2期909-916,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60602004);中国博士后科学基金;国家高技术研究发展计划(批准号:2006AA01Z244);教育部留学归国人员教学、科研经费建设项目资助的课题.~~

摘　　要：提出了双通构型的基于"和频"和"差频"级联二阶非线性效应的可变波长路由方案,通过调节两个抽运源的频率,可以从一个WDM(wavelength division multiplexing)链路中取出任意一个信道,然后将其转换为任意一个波长并插入到另一个WDM链路中去.实现了可调谐波长转换和光波长路由的结合.通过小信号分析,给出了相位匹配情况下,输入信号光在波导中功率变化的表达式和输出转换光功率变化的表达式,并给出了提高系统效率的对两个抽运光功率的优化方案.数值计算表明,只要信道间隔大于0·2nm(25GHz),就可以对感兴趣的信道安全地进行波长转换和路由操作,不会影响WDM链路中的其他信道.通过改变输入-输出的配置,该方案还可以形成可调波长上路器,可调波长下路器/宽带可调光滤波器以及可调波长转换器.将两个可变波长路由器组合在一起,可以构成波长转换型光交叉连接单元.A tunable wavelength routing scheme based on sum- and difference- frequency generation （SFG ＋ DFG） is proposed, where the concept of double pass configuration is employed. An arbitrary channel can be dropped from a WDM signal and added to another WDM signal at arbitrary wavelength. Therefore, the tunable wavelength conversion and wavelength routing are integrated together in this scheme. The theoretical expression of the input signal wave and the converted wave are derived under the assumption of ＂small signal＂ when the phase is matched perfectly. Numerical calculations were performed which showed that the cross-talk can be suppressed provided the spacing of the WDM channels is greater than 0.2 nm （25 GHz）. If the input or output of this device is changed, this scheme can be utilized as tunable wavelength add multiplexer, tunable wavelength drop multiplexer, wide tunable wavelength filter or tunable wavelength converter. A wavelength interchange cross connection （WIXC） unit can also be realized by employing two devices of this scheme.

关 键 词：光波长路由 光波长转换 光交换 PPLN 

分 类 号：TN929.1[电子电信—通信与信息系统]