Mitigation of Fiber Nonlinearity Using a Digital Coherent Receiver

Author

Millar, David S. ; Makovejs, Sergejs ; Behrens, Carsten ; Hellerbrand, Stephan ; Killey, Robert I. ; Bayvel, Polina ; Savory, Seb J.

Author_Institution

Dept. of Electron. & Electr. Eng., Opt. Networks Group, Univ. Coll. London, London, UK

Volume

16

Issue

5

fYear

2010

Firstpage

1217

Lastpage

1226

Abstract

Coherent detection with receiver-based DSP has recently enabled the mitigation of fiber nonlinear effects. We investigate the performance benefits available from the backpropagation algorithm for polarization division multiplexed quadrature amplitude phase-shift keying (PDM-QPSK) and 16-state quadrature amplitude modulation (PDM-QAM16). The performance of the receiver using a digital backpropagation algorithm with varying nonlinear step size is characterized to determine an upper bound on the suppression of intrachannel nonlinearities in a single-channel system. The results show that for the system under investigation PDM-QPSK and PDM-QAM16 have maximum step sizes for optimal performance of 160 and 80 km, respectively. Whilst the optimal launch power is increased by 2 and 2.5 dB for PDM-QPSK and PDM-QAM16, respectively, the Q-factor is correspondingly increased by 1.6 and 1 dB, highlighting the importance of studying nonlinear compensation for higher level modulation formats.

Keywords

light coherence; nonlinear optics; optical fibre communication; optical fibre dispersion; optical fibre polarisation; optical receivers; quadrature amplitude modulation; quadrature phase shift keying; wavelength division multiplexing; 16-state quadrature amplitude modulation; PDM-QAM16; PDM-QPSK; Q-factor; coherent detection; digital backpropagation algorithm; digital coherent receiver; fiber nonlinearity mitigation; nonlinear compensation; polarization division multiplexed quadrature amplitude phase-shift keying; single-channel system; Backpropagation algorithms; Digital signal processing; Fiber nonlinear optics; Nonlinear optics; Optical fiber polarization; Optical polarization; Optical receivers; Phase detection; Quadrature amplitude modulation; Wavelength division multiplexing; Coherent detection; digital backpropagation; nonlinearity compensation; quadrature amplitude modulation (QAM);

fLanguage

English

Journal_Title

Selected Topics in Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

1077-260X

Type

jour

DOI

10.1109/JSTQE.2010.2047247

Filename

5467218