Study on RZ-4PAM downstream signals with duty cycles of 33% and 50% for optical access system application  

作　　者：CHEN Fu-ping SHAG Yu-feng CHEN Lao SHEN Shi-lu WANG An- rong LUO Ying-xiang ZHAO Yun-jle 陈福平;邵宇丰;陈烙;申世鲁;王安蓉;罗映祥;赵云杰(College of Electronic and information Engineering, Chongqing Three Gorges University, Chongqing 404100, China)

机构地区：College of Electronic and lnformation Engineering, Chongqing Three Gorges University, Chongqing 404100, China

出　　处：《Optoelectronics Letters》2017年第1期63-66,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61107064);the Chongqing University Innovation Team Founding(No.KJTD201320);the Natural Science Foundation of Chongqing Science & Technology Commission(Nos.cstc2014jcyj A40046 and cstc2016jcyj A1233);the Science and Technology Special Funds of Wanzhou District in Chongqing City;the Chongqing Graduate Student Research Innovation Project(No.CYS15225);the Chongqing Three Gorges University Graduate Scientific Research Innovation Project

摘　　要：4-ary pulse amplitude modulation(4PAM) signals with 33% and 50% return-to-zero(RZ) clocks are generated for passive optical network(PON). We demonstrate that RZ-4PAM signals with duty cycles of 33% and 50% after transmission over 20-km-long single mode fiber(SMF) at 10 Gbit/s can be directly detected by using one photo detector,and the original data can also be restored by one M-ary threshold detector and one 4PAM sequence decoder. The optical spectra of 33% and 50% RZ-4PAM signals are measured,and their eye-diagrams before and after transmission are also analyzed. Simulation results show that 33% and 50% RZ-4PAM downlink signals can be received effectively,and the received power values are-15.1 d Bm and-13.8 d Bm when the bit error rate(BER) is 10^(-6). Moreover,33% RZ-4PAM optical signals have better reception performance than 50% RZ-4PAM optical signals.

关 键 词：downstream decoder restored downlink return transmitting deliver modulator customer instead 

分 类 号：TN929.1[电子电信—通信与信息系统]