Open AccessOptical filter requirements in an EML-based single-sideband PAM4 intensity-modulation and direct-detection transmission system
Author(s) -
Hsing-Yu Chen,
Noriaki Kaneda,
Jeffrey Lee,
Jyehong Chen,
Young Kai Chen
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.005852
Subject(s) - compatible sideband transmission , intensity modulation , transmission (telecommunications) , chirp , sideband , optics , modulation (music) , filter (signal processing) , signal (programming language) , pulse amplitude modulation , optical filter , interference (communication) , optical power , electronic engineering , computer science , physics , telecommunications , phase modulation , pulse (music) , radio frequency , acoustics , laser , phase noise , detector , channel (broadcasting) , engineering , programming language , computer vision
The feasibility of a single sideband (SSB) PAM4 intensity-modulation and direct-detection (IM/DD) transmission based on a CMOS ADC and DAC is experimentally demonstrated in this work. To cost effectively build a >50 Gb/s system as well as to extend the transmission distance, a low cost EML and a passive optical filter are utilized to generate the SSB signal. However, the EML-induced chirp and dispersion-induced power fading limit the requirements of the SSB filter. To separate the effect of signal-signal beating interference, filters with different roll-off factors are employed to demonstrate the performance tolerance at different transmission distance. Moreover, a high resolution spectrum analysis is proposed to depict the system limitation. Experimental results show that a minimum roll-off factor of 7 dB/10GHz is required to achieve a 51.84Gb/s 40-km transmission with only linear feed-forward equalization.