Mitigation of Fiber Nonlinearity Using a Digital Coherent Receiver

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 quadra...

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Bibliographic Details
Published in:IEEE journal of selected topics in quantum electronics Vol. 16; no. 5; pp. 1217 - 1226
Main Authors: Millar, D S, Makovejs, S, Behrens, C, Hellerbrand, S, Killey, R I, Bayvel, P, Savory, S J
Format: Journal Article
Language:English
Published: New York IEEE 01.09.2010
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Back propagation
Backpropagation algorithms
Coherence
Coherent detection
Digital
digital backpropagation
Digital signal processing
Fiber nonlinear optics
Fibers
Multiplexing
Noise levels
Nonlinear optics
Nonlinearity
nonlinearity compensation
Optical fiber polarization
Optical polarization
Optical receivers
Phase detection
Quadrature amplitude modulation
quadrature amplitude modulation (QAM)
Receivers
Wavelength division multiplexing
ISSN:1077-260X, 1558-4542
Online Access:Get full text
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Summary: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.
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ISSN:1077-260X
1558-4542
DOI:10.1109/JSTQE.2010.2047247