Open AccessA single-channel 192 Tbit/s, 64 QAM coherent optical pulse transmission over 150 km using frequency-domain equalization
Author(s) -
David O. Otuya,
Keisuke Kasai,
Masato Yoshida,
Toshihiko Hirooka
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.21.022808
Subject(s) - optics , transmission (telecommunications) , quadrature amplitude modulation , terabit , qam , bit error rate , pulse shaping , physics , computer science , equalization (audio) , multiplexing , electronic engineering , channel (broadcasting) , telecommunications , wavelength division multiplexing , laser , engineering , wavelength
We demonstrate a single-channel 1.92 Tbit/s, 64 QAM coherent optical pulse optical time-division multiplexing (OTDM) transmission by utilizing frequency-domain equalization (FDE). FDE makes it possible to compensate precisely for the waveform distortions caused by hardware imperfections thus greatly improving the error vector magnitude (EVM) of the demodulated 64 QAM signal compared with that obtained with a conventional FIR filter. As a result, a coherent 64 QAM OTDM transmission over 150 km with a bit error rate of below the forward error correction limit of 2 x 10⁻³ (requiring 7% overhead) was achieved for the first time.