Application Research of CRZ-4PAM Optical Access Signals
DOI:
https://doi.org/10.54097/hset.v23i.3127Keywords:
CRZ-4PAM, Optical Access Signals, Modulation.Abstract
In this paper, the generation and transmission of chirped return-to-zero 4-ary pulse amplitude modulation (CRZ-4PAM) signals in passive optical networks (PONs) is proposed and investigated. The optical spectra, time-domain phase and chirp change diagrams of CRZ-4PAM signals are measured, and their eye-diagrams before and after transmission are also analyzed. We demonstrate that CRZ-4PAM signals after transmission over 20km single mode fiber (SMF) at 10Gb/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 PAM sequence decoder. The results demonstrate that CRZ-4PAM downlink signals can be received effectively at the BER value of 10-6, and exhibits 2.4 dB receiver power penalty compared with the back to back case.
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