Generation of multi-carrier based on a recirculating frequency shifter with delay interferometer  

作　　者：成虹桥 席丽霞 林嘉川 张晓光 张霞 李建蕊 

机构地区：[1]State Key Laboratory of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications [2]Key Laboratory of Optical Communications Science & Technology in Shandong Province of China,Liaocheng University

出　　处：《Optoelectronics Letters》2013年第6期418-420,共3页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61205065);the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20110005110014);the Provincial Natural Foundation of Shandong(No.ZR2010FM043)

摘　　要：Recirculating frequency shifter(RFS)can generate stable multi-carrier,but the carrier-to-noise-ratio(CNR)is limited because noise is accumulated round by round in the recirculation loop structure.A modified RFS with a delay interferometer(DI)is proposed in this paper.The DI can suppress the accumulated noise,and enhance the CNR of multi-carrier.The principle of the generation of high quality multi-carrier based on an RFS with DI is analyzed theoretically.50 stable carriers with spacing of 10.7 GHz are successfully generated.The flatness of 50 stable carriers is 3 dB,and the CNR is 43 dB which is increased by 3 dB compared with the structure without DI.Recirculating frequency shifter （RFS） can generate stable multi-carder, but the carder-to-noise-ratio （CNR） is limited because noise is accumulated round by round in the recirculation loop structure. A modified RFS with a delay inter- ferometer （DI） is proposed in this paper. The DI can suppress the accumulated noise, and enhance the CNR of multi-carrier. The principle of the generation of high quality multi-carrier based on an RFS with DI is analyzed theoretically. 50 stable carriers with spacing of 10.7 GHz are successfully generated. The flatness of 50 stable carriers is 3 dB, and the CNR is 43 dB which is increased by 3 dB compared with the structure without DI.

关 键 词：循环回路 多载波 干涉仪 延迟 频移 基础 抑制噪声 RFS 

分 类 号：TN761[电子电信—电路与系统]