Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling

In this study, we demonstrated generation and transmission of 114 Gbaud and 126 Gbaud faster-than-Nyquist (FTN) discrete Fourier transform-spread (DFT-spread) quadrature phase shift keying orthogonal frequency division multiplexing (QPSK-OFDM) with 88-Gsa/s sampling rate digital-to-analog converters...

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Main Authors: Peng Liu, Hongxian Chen, Weihao Ni, Fan Li
Format: Article
Language:English
Published: Frontiers Media S.A. 2021-08-01
Series:Frontiers in Physics
Subjects:
Online Access:https://www.frontiersin.org/articles/10.3389/fphy.2021.720539/full
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author Peng Liu
Hongxian Chen
Weihao Ni
Fan Li
author_facet Peng Liu
Hongxian Chen
Weihao Ni
Fan Li
author_sort Peng Liu
collection DOAJ
description In this study, we demonstrated generation and transmission of 114 Gbaud and 126 Gbaud faster-than-Nyquist (FTN) discrete Fourier transform-spread (DFT-spread) quadrature phase shift keying orthogonal frequency division multiplexing (QPSK-OFDM) with 88-Gsa/s sampling rate digital-to-analog converters (DACs) experimentally. It is the first time to realize 400G FTN DFT-spread QPSK-OFDM signal per optical carrier for metro and regional applications, which will be a solution for network operators to address the issue of increasing bandwidth derived from the rapid popularization of mobile Internet and the wide application of IoT (Internet of Things technology). Delay-and-add filter (DAF) is adopted to realize frequency shaping at the transmitter to keep higher portions of energy of signal at low frequencies, which makes the OFDM much more robust to strong filtering effect. After pre-equalization, bit error rate (BER) performance of 114 GBaud and 126 GBaud FTN DFT-spread QPSK-OFDM has been significantly improved, and maximum-likelihood sequence estimation (MLSE) shows a better effect than binary decoding in the aspect of against the inter symbol interference (ISI) introduced by spectrum compression. The effective bit rate of dual polarization 126 Gbaud FTN DFT-spread QPSK-OFDM which is generated with 88 GSa/s sampling rate is 410.08 Gb/s, to the exclusion of all overhead including TSs, cyclic prefix (CP), and 20% forward error correction (FEC) coding. We successfully transmit 8 × 400 Gbit/s FTN DFT-spread QPSK-OFDM signal generated from 88 Gsa/s sampling rate DAC over 420 km single mode fiber (SMF) with the BER under 2.4 × 10−2.
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spelling doaj.art-d83aa0c52c6245f9802f0cef06208fe42022-12-21T21:47:01ZengFrontiers Media S.A.Frontiers in Physics2296-424X2021-08-01910.3389/fphy.2021.720539720539Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s UndersamplingPeng Liu0Hongxian Chen1Weihao Ni2Fan Li3The School of Computer, Guangdong University of Technology, Guangzhou, ChinaPLA Troops, Guangzhou, ChinaThe Key Laboratory of Optoelectronic Materials, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, ChinaThe Key Laboratory of Optoelectronic Materials, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou, ChinaIn this study, we demonstrated generation and transmission of 114 Gbaud and 126 Gbaud faster-than-Nyquist (FTN) discrete Fourier transform-spread (DFT-spread) quadrature phase shift keying orthogonal frequency division multiplexing (QPSK-OFDM) with 88-Gsa/s sampling rate digital-to-analog converters (DACs) experimentally. It is the first time to realize 400G FTN DFT-spread QPSK-OFDM signal per optical carrier for metro and regional applications, which will be a solution for network operators to address the issue of increasing bandwidth derived from the rapid popularization of mobile Internet and the wide application of IoT (Internet of Things technology). Delay-and-add filter (DAF) is adopted to realize frequency shaping at the transmitter to keep higher portions of energy of signal at low frequencies, which makes the OFDM much more robust to strong filtering effect. After pre-equalization, bit error rate (BER) performance of 114 GBaud and 126 GBaud FTN DFT-spread QPSK-OFDM has been significantly improved, and maximum-likelihood sequence estimation (MLSE) shows a better effect than binary decoding in the aspect of against the inter symbol interference (ISI) introduced by spectrum compression. The effective bit rate of dual polarization 126 Gbaud FTN DFT-spread QPSK-OFDM which is generated with 88 GSa/s sampling rate is 410.08 Gb/s, to the exclusion of all overhead including TSs, cyclic prefix (CP), and 20% forward error correction (FEC) coding. We successfully transmit 8 × 400 Gbit/s FTN DFT-spread QPSK-OFDM signal generated from 88 Gsa/s sampling rate DAC over 420 km single mode fiber (SMF) with the BER under 2.4 × 10−2.https://www.frontiersin.org/articles/10.3389/fphy.2021.720539/fullorthogonal frequency division multiplexingdiscrete fourier transform-spreadWDMpre-equalizationfaster-than-nyquist
spellingShingle Peng Liu
Hongxian Chen
Weihao Ni
Fan Li
Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling
Frontiers in Physics
orthogonal frequency division multiplexing
discrete fourier transform-spread
WDM
pre-equalization
faster-than-nyquist
title Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling
title_full Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling
title_fullStr Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling
title_full_unstemmed Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling
title_short Faster-Than-Nyquist 400 G Implementation Using 126-GBaud QPSK-OFDM With 88-GSa/s Undersampling
title_sort faster than nyquist 400 g implementation using 126 gbaud qpsk ofdm with 88 gsa s undersampling
topic orthogonal frequency division multiplexing
discrete fourier transform-spread
WDM
pre-equalization
faster-than-nyquist
url https://www.frontiersin.org/articles/10.3389/fphy.2021.720539/full
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AT hongxianchen fasterthannyquist400gimplementationusing126gbaudqpskofdmwith88gsasundersampling
AT weihaoni fasterthannyquist400gimplementationusing126gbaudqpskofdmwith88gsasundersampling
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