Performance Limits of Nyquist-WDM and CO-OFDM in High-Speed PM-QPSK Systems

We compare by simulation the performance of two techniques for generating polarization-multiplexed quadrature phase-shift keying with a high spectral efficiency (SE). The first is based on coherent optical orthogonal frequency-division multiplexing (CO-OFDM). The second, which we call Nyquist wavele...

Full description

Saved in:

Bibliographic Details
Published in:	IEEE photonics technology letters 2010-08, Vol.22 (15), p.1129-1131
Main Authors:	Bosco, Gabriella, Carena, Andrea, Curri, Vittorio, Poggiolini, Pierluigi, Forghieri, Fabrizio
Format:	Article
Language:	eng
Subjects:	Bandwidth Cobalt Coherent detection coherent optical orthogonal frequency-division multiplexing (CO-OFDM) Conferences dual-polarization quadrature phase-shift keying (DP-QPSK) Fiber optics Frequency division multiplexing High speed optical techniques Multiplexing Nonlinear optics Nyquist wavelength-division multiplexing (N-WDM) Optical fibers Optical polarization Optical pulses Optical receivers Optical sensors Orthogonal Frequency Division Multiplexing Phase shift keying Photonics polarization-division-multiplexing quadrature phase-shift keying (PDM-QPSK) polarization-multiplexed quadrature phase-shift keying (PM-QPSK) Wavelength division multiplexing
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	We compare by simulation the performance of two techniques for generating polarization-multiplexed quadrature phase-shift keying with a high spectral efficiency (SE). The first is based on coherent optical orthogonal frequency-division multiplexing (CO-OFDM). The second, which we call Nyquist wavelength-division multiplexing (N-WDM), is based on the use of optical pulses having an "almost" rectangular spectrum, with bandwidth ideally equal to the Baud-rate. We show that the two techniques have the same sensitivity and SE under idealized assumptions. However, we found that CO-OFDM requires a much larger receiver bandwidth and proportionally faster speed of the analog-to-digital converters. We also tested CO-OFDM and N-WDM over long-haul nonlinear links and found N-WDM to outperform CO-OFDM in this case, too.
ISSN:	1041-1135 1941-0174