Generation and transmission of 512-Gb/s quad-carrier digital super-Nyquist spectral shaped signal | Zendy

Junwen Zhang | Zendy; Jianjun Yu | Zendy; Nan Chi | Zendy

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Generation 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 , quadrature amplitude modulation , nyquist frequency , bandwidth (computing) , qam , optics , multiplexing , computer science , signal (programming language) , physics , phase shift keying , electronic engineering , telecommunications , channel (broadcasting) , bit error rate , 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).

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