Open AccessSingle-channel 192 Tbit/s, Pol-Mux-64 QAM coherent Nyquist pulse transmission over 150 km with a spectral efficiency of 75 bit/s/Hz
Author(s) -
David O. Otuya,
Keisuke Kasai,
Masato Yoshida,
Toshihiko Hirooka,
Masataka Nakazawa
Publication year - 2014
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.22.023776
Subject(s) - terabit , optics , nyquist–shannon sampling theorem , spectral efficiency , physics , multiplexing , quadrature amplitude modulation , transmission (telecommunications) , qam , pulse shaping , bandwidth (computing) , multiplexer , channel (broadcasting) , telecommunications , electronic engineering , computer science , bit error rate , wavelength division multiplexing , engineering , wavelength , laser
Coherent Nyquist pulses have been used for optical time division multiplexed (OTDM) digital coherent transmission, and a single-channel 1.92 Tbit/s, Pol-Mux-64 QAM coherent Nyquist pulse transmission over 150 km is demonstrated. The ability to considerably reduce the spectral bandwidth of the data signal enabled us to increase the spectral efficiency from 3.2 bit/s/Hz to 7.5 bit/s/Hz when using a Gaussian pulse train.