Author(s): Zhang, HG (Zhang, Hongguang); Li, MF (Li, Miaofeng); Zhang, YG (Zhang, Yuguang); Zhang, D (Zhang, Di); Liao, QW (Liao, Qiwen); He, J (He, Jian); Hu, SL (Hu, Shenglei); Zhang, B (Zhang, Bo); Wang, L (Wang, Lei); Xiao, X (Xiao, Xi); Qi, N (Qi, Nan); Yu, SH (Yu, Shaohua)

Source: PHOTONICS RESEARCH Volume: 8 Issue: 11 Pages: 1776-1782 DOI: 10.1364/PRJ.396815 Published: NOV 2020

Abstract: We demonstrate the optical transmission of an 800 Gbit/s (4 x 200 Gbit/s) pulse amplitude modulation-4 (PAM-4) signal and a 480 Gbit/s ( 4 x 120 Gbit/s) on-off-keying (OOK) signal by using a high-bandwidth (BW) silicon photonic (SiP) transmitter with the aid of digital signal processing (DSP). In this transmitter, a four-channel SiP modulator chip is co-packaged with a four-channel driver chip, with a measured 3 dB BW of 40 GHz. DSP is applied in both the transmitter and receiver sides for pre-/post-compensation and bit error rate (BER) calculation. Back-to-back (B2B) BERs of the PAM-4 signal and OOK signal are first measured for each channel of the transmitter with respect to a variety of data rates. Similar BER performance of four channels shows good uniformity of the transmitter between different channels. The BER penalty of the PAM-4 and OOK signals for 500 m and 1 km standard single-mode fiber (SSMF) transmission is then experimentally tested by using one channel of the transmitter. For a 200 Gbit/s PAM-4 signal, the BER is below the hard-decision forward error correction (HD-FEC) threshold for B2B and below the soft-decision FEC (SD-FEC) threshold after 1 km transmission. For a 120 Gbit/s OOK signal, the BER is below SD-FEC threshold for B2B. After 500 m and 1 km transmission, the data rate of the OOK signal shrinks to 119 Gbit/s and 118 Gbit/s with the SD-FEC threshold, respectively. Finally, the 800 Gbit/s PAM-4 signal with 1 km transmission is achieved with the BER of all four channels below the SD-FEC threshold. (C) 2020 Chinese Laser Press

Accession Number: WOS:000585199700016

ISSN: 2327-9125

Full Text: https://www.osapublishing.org/prj/fulltext.cfm?uri=prj-8-11-1776&id=441980