Title :
Performance of a semi-Nyquist NRZ-DQPSK system employing a flexible gain-switched multicarrier transmitter
Author :
Vujicic, Vidak ; Rui Zhou ; Anandarajah, Prince M. ; O´Carroll, J. ; Barry, Liam P.
Author_Institution :
Sch. of Electron. Eng., Dublin City Univ., Dublin, Ireland
Abstract :
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.
Keywords :
channel spacing; optical fibre communication; optical transmitters; quadrature phase shift keying; wavelength division multiplexing; Tb superchannel; carrier polarization division multiplexed NRZ-DQPSK; channel spacing; distance 320 km; flexible gain switched multicarrier transmitter; frequency 15 GHz; frequency 33 GHz; multichannel NRZ-DQPSK signal; nonreturn to zero differential quadrature phase shift keying; optical link; semiNyquist NRZ-DQPSK system; single mode fiber; spectral efficiency; tunable free spectral range; wavelength division multiplexing; Adaptive optics; Optical attenuators; Optical fibers; Optical filters; Optical polarization; Optical transmitters; Direct detection; Multicarrier transmitter; NRZ-DQPSK; Optical filtering; Semi-Nyquist system; Spectral efficiency;
Journal_Title :
Optical Communications and Networking, IEEE/OSA Journal of
DOI :
10.1364/JOCN.6.000282
