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

Autor: Chen, Fu-ping, Shao, Yu-feng, Chen, Lao, Shen, Shi-lu, Wang, Anrong, Luo, Ying-xiang, Zhao, Yun-jie
Zdroj: Optoelectronics Letters; Jan2017, Vol. 13 Issue 1, p63-66, 4p
Abstrakt: 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. Moreover, 33% RZ-4PAM optical signals have better reception performance than 50% RZ-4PAM optical signals. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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