Open AccessGeneration and transmission of 512-Gb/s quad-carrier digital super-Nyquist spectral shaped signal
Author(s) -
Junwen Zhang,
Jianjun Yu,
Nan Chi
Publication year - 2013
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.21.031212
Subject(s) - nyquist–shannon sampling theorem , anti aliasing filter , nyquist frequency , quadrature amplitude modulation , bandwidth (computing) , qam , optics , phase shift keying , computer science , signal (programming language) , physics , multiplexing , electronic engineering , nyquist rate , telecommunications , channel (broadcasting) , bit error rate , detector , sampling (signal processing) , engineering , digital filter , root raised cosine filter , programming language
A novel digital super-Nyquist signal generation scheme is proposed to further suppress the Nyquist signal bandwidth and reduce the channel crosstalk without using optical pre-filtering. The spectrum of the generated super-Nyquist 9-QAM signal is much more compact compared with regular Nyquist QPSK signal. Therefore, only optical couplers are needed for super-Nyquist WDM channel multiplexing. By using the 64-GSa/s high speed DAC, 32-GBaud super-Nyquist 9-QAM signal is generated within 25-GHz grid for quad-carrier 400G channels. We successfully generate and transmit 4 channels quad-carrier 512-Gb/s super-Nyquist 9-QAM-like signal within 100-GHz grid over 2975-km at a net SE of 4b/s/Hz (after excluding the 20% soft-decision FEC overhead).