Performance of a semi-Nyquist NRZ-DQPSK system employing a flexible gain-switched multicarrier transmitter

The authors report on a strongly filtered direct detected non-return-to-zero differential quadrature phase shift keying (NRZ-DQPSK) system, based on a multicarrier transmitter with a tunable free spectral range. Transmission of a 7×21.4 Gb/s multichannel NRZ-DQPSK signal over a dispersion compensate...

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Bibliographic Details
Published in:Journal of optical communications and networking 2014-03, Vol.6 (3), p.282-290
Main Authors: Vujicic, Vidak, Rui Zhou, Anandarajah, Prince M., O'Carroll, John, Barry, Liam P.
Format: Article
Language:English
Subjects:
Adaptive optics
Channels
Direct detection
Dispersions
Legacy
Multicarrier transmitter
Multiplexing
NRZ-DQPSK
Optical attenuators
Optical fibers
Optical filtering
Optical filters
Optical polarization
Optical transmitters
Semi-Nyquist system
Simulation
Spectra
Spectral efficiency
Transmitters
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Summary:The authors report on a strongly filtered direct detected non-return-to-zero differential quadrature phase shift keying (NRZ-DQPSK) system, based on a multicarrier transmitter with a tunable free spectral range. Transmission of a 7×21.4 Gb/s multichannel NRZ-DQPSK signal over a dispersion compensated optical link (legacy optical infrastructure) on a 15 GHz grid is investigated experimentally and by simulations. Further improvement of the spectral efficiency is demonstrated by simulating the same 7 × 21.4 Gb/s system on a 12.5 GHz grid. Finally, the scalability of the proposed system is investigated by simulating the transmission of a Tb superchannel, composed of a 10-carrier polarization division multiplexed NRZ-DQPSK operating at 28 GBaud on 33 GHz channel spacing, over 320 km standard single-mode fiber.
ISSN:1943-0620
1943-0639
DOI:10.1364/JOCN.6.000282