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Photonics 2016, 3(2), 12; doi:10.3390/photonics3020012

Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing

1
Optics and Photonics Division, Royal Institute of Technology (KTH), Stockholm 164 40, Sweden
2
Acreo Swedish ICT AB, Stockholm 164 40, Sweden
3
VPIphotonics GmBH, Berlin 10587, Germany
*
Author to whom correspondence should be addressed.
Received: 15 February 2016 / Revised: 22 March 2016 / Accepted: 22 March 2016 / Published: 26 March 2016
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Abstract

We present an extensive study of equalization enhanced phase noise (EEPN) in coherent optical system for all practical electronic dispersion compensation configurations. It is shown that there are only eight practicable all-electronic impairment mitigation configurations. The non-linear and time variant analysis reveals that the existence and the cause of EEPN depend on the digital signal processing (DSP) schemes. There are three schemes that in principle do not cause EEPN. Analysis further reveals the statistical equivalence of the remaining five system configurations resulting in EEPN. In three of them, EEPN is due to phase noise of the transmitting laser, while in the remaining two, EEPN is caused by the local oscillator. We provide a simple look-up table for the system designer to make an informative decision regarding practicable configuration choice and design. View Full-Text
Keywords: coherent receivers; quadrature amplitude modulation (QAM); equalization-enhanced phase noise (EEPN); laser linewidth, optical communication; digital signal processing (DSP); electronic dispersion compensation (EDC) coherent receivers; quadrature amplitude modulation (QAM); equalization-enhanced phase noise (EEPN); laser linewidth, optical communication; digital signal processing (DSP); electronic dispersion compensation (EDC)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kakkar, A.; Rodrigo Navarro, J.; Schatz, R.; Pang, X.; Ozolins, O.; Louchet, H.; Jacobsen, G.; Popov, S. Equalization Enhanced Phase Noise in Coherent Optical Systems with Digital Pre- and Post-Processing. Photonics 2016, 3, 12.

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