Open Access52 Gbps PAM4 receiver sensitivity study for 400GBase-LR8 system using directly modulated laser
Author(s) -
Reza Motaghiannezam,
Tuan Minh Pham,
Alan Chen,
Tengda Du,
Chris Kocot,
Jack Xu,
Bernd Huebner
Publication year - 2016
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.007374
Subject(s) - optics , materials science , photodetector , laser , bit error rate , avalanche photodiode , optoelectronics , sensitivity (control systems) , modulation (music) , dbm , physics , cmos , telecommunications , detector , electronic engineering , computer science , engineering , amplifier , channel (broadcasting) , acoustics
Real-time 52 Gbps PAM4 transmission is demonstrated over single mode fiber (SMF) using a directly modulated laser (DML) and a PHY chip. The inner eye optical modulation amplitude (OMA) receiver sensitivities were measured and compared using avalanche photodetector (APD) and PIN photodetector (PD) for the maximum and minimum chromatic dispersions (CDs) of 400GBase-LR8 link. The measured inner eye OMAs were -17.8 dBm and -18.8 dBm for + 10 ps/nm and -58 ps/nm of CDs at the KP4 bit error rate (BER) threshold of 2 × 10 -4 using a PIN PD, respectively. The measured inner eye OMA was improved to -21.0 dBm for -58 ps/nm of CD at the KP4 BER threshold using an APD. Negligible OMA penalty (< 0.4 dB) was captured for operating DML at different bias currents of 40 mA and 60 mA using a PIN PD and an APD for both positive and negative CDs at the KP4 BER threshold.