Nonlinear mitigation using carrier phase estimation and digital backward propagation in coherent QAM transmission

Chien Yu Lin; Rameez Asif; Michael Holtmannspoetter; Bernhard Schmauss

doi:10.1364/OE.20.00B405

Nonlinear mitigation using carrier phase estimation and digital backward propagation in coherent QAM transmission

Chien Yu Lin, Rameez Asif, Michael Holtmannspoetter, Bernhard Schmauss

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

Abstract

We investigate the performance of carrier phase estimation (CPE) and digital backward propagation (DBP) in compensating fiber nonlinearity for 224Gbps polarization-multiplexed quadrature-amplitudemodulation coherent systems with level of 4 and 16 (PM-4-QAM and PM-16-QAM) over standard single-mode fiber (SSMF) uncompensated link. The results from numerical simulation show the individual performance of CPE and DBP as well as their mutual influence. With DBP compensation, required CPE tap number for optimal performance can be reduced by 50% for 4-QAM signal and 67% for 16-QAM signal compared to linear compensation. On the other hand, employing CPE compensation after DBP also allows to reduce DBP steps. In the mentioned PM-16-QAM system, 60% reduction in the required number of DBP steps to achieve BER=10-3 is possible, with a step-size of 200km, which reveals great potential to reduce the complexity for future real time implementation.

Original language	English
Pages (from-to)	B405-B412
Journal	Optics Express
Volume	20
Issue number	26
DOIs	https://doi.org/10.1364/OE.20.00B405
Publication status	Published - 10 Dec 2012

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10.1364/OE.20.00B405Licence: CC BY

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abstract = "We investigate the performance of carrier phase estimation (CPE) and digital backward propagation (DBP) in compensating fiber nonlinearity for 224Gbps polarization-multiplexed quadrature-amplitudemodulation coherent systems with level of 4 and 16 (PM-4-QAM and PM-16-QAM) over standard single-mode fiber (SSMF) uncompensated link. The results from numerical simulation show the individual performance of CPE and DBP as well as their mutual influence. With DBP compensation, required CPE tap number for optimal performance can be reduced by 50% for 4-QAM signal and 67% for 16-QAM signal compared to linear compensation. On the other hand, employing CPE compensation after DBP also allows to reduce DBP steps. In the mentioned PM-16-QAM system, 60% reduction in the required number of DBP steps to achieve BER=10-3 is possible, with a step-size of 200km, which reveals great potential to reduce the complexity for future real time implementation.",

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AU - Lin, Chien Yu

AU - Asif, Rameez

AU - Holtmannspoetter, Michael

AU - Schmauss, Bernhard

PY - 2012/12/10

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N2 - We investigate the performance of carrier phase estimation (CPE) and digital backward propagation (DBP) in compensating fiber nonlinearity for 224Gbps polarization-multiplexed quadrature-amplitudemodulation coherent systems with level of 4 and 16 (PM-4-QAM and PM-16-QAM) over standard single-mode fiber (SSMF) uncompensated link. The results from numerical simulation show the individual performance of CPE and DBP as well as their mutual influence. With DBP compensation, required CPE tap number for optimal performance can be reduced by 50% for 4-QAM signal and 67% for 16-QAM signal compared to linear compensation. On the other hand, employing CPE compensation after DBP also allows to reduce DBP steps. In the mentioned PM-16-QAM system, 60% reduction in the required number of DBP steps to achieve BER=10-3 is possible, with a step-size of 200km, which reveals great potential to reduce the complexity for future real time implementation.

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Nonlinear mitigation using carrier phase estimation and digital backward propagation in coherent QAM transmission

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