Study on RZ-4PAM downstream signals with duty cycles of 33% and 50% for optical access system application |
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| Authors: | CHEN Fu-ping SHAO Yu-feng CHEN Lao SHEN Shi-lu WANG An-rong LUO Ying-xiang and ZHAO Yun-jie |
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| Affiliation: | College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China |
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| Abstract: | 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 dBm and ?13.8 dBm 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. |
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