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Digital compensation of chromatic dispersion in 112-Gbit/s PDM-QPSK system
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Optics (Closed 20120101). (Optics & Photonics)
Acreo AB, Electrum 236, Kista, Sweden.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Optics (Closed 20120101).
Acreo AB, Electrum 236, Kista, Sweden.
Show others and affiliations
2009 (English)In: 2009 Asia Communications and Photonics Conference and Exhibition, ACP 2009, 2009, 5377275- p.Conference paper, Published paper (Refereed)
Abstract [en]

Coherent optical receivers with digital filters can mitigate the impairments in optical transmission system. In this paper, an adaptive filter employing NLMS algorithm is developed for chromatic dispersion compensation in a 112-Gbit/s PDM-QPSK coherent communication system. The performance of the adaptive filter is analyzed by comparing with present digital filters .

Place, publisher, year, edition, pages
2009. 5377275- p.
Keyword [en]
Coherent communication, Digital compensation, NLMS algorithm, Optical transmission systems, Adaptive algorithms, Adaptive filtering, Adaptive filters, Chromatic dispersion, Communication systems, Electric filters, Quadrature phase shift keying, Light transmission
National Category
Atom and Molecular Physics and Optics Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-35420Scopus ID: 2-s2.0-77949413923ISBN: 978-155752877-3 (print)OAI: oai:DiVA.org:kth-35420DiVA: diva2:428129
Conference
2009 Asia Communications and Photonics Conference and Exhibition, ACP 2009; Shanghai; China; 2 November 2009 through 6 November 2009
Note

QC 20110629

Available from: 2011-06-29 Created: 2011-06-29 Last updated: 2014-10-14Bibliographically approved
In thesis
1. Digital Dispersion Equalization and Carrier Phase Estimation in 112-Gbit/s Coherent Optical Fiber Transmission System
Open this publication in new window or tab >>Digital Dispersion Equalization and Carrier Phase Estimation in 112-Gbit/s Coherent Optical Fiber Transmission System
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Coherent detection employing multilevel modulation format has become one of the most promising technologies for next generation high speed transmission system due to the high power and spectral efficiencies. With the powerful digital signal processing (DSP), coherent optical receivers allow the significant equalization of chromatic dispersion (CD), polarization mode dispersion (PMD), phase noise (PN) and nonlinear effects in the electrical domain. Recently, the realizations of these DSP algorithms for mitigating the channel distortions in the transmission system are the most attractive investigations. 

The CD equalization can be performed by the digital filters developed in the time and the frequency domain, which can suppress the fiber dispersion effectively. The PMD compensation is usually performed in the time domain with the adaptive least mean square (LMS) and constant modulus algorithms (CMA) equalization. Feed-forward and feed-back carrier phase estimation algorithms are employed to mitigate the phase noise from the transmitter and local oscillator lasers. The fiber nonlinearities are compensated by using the digital backward propagation methods based on solving the nolinear Schrodinger (NLS) equation and the Manakov equation. 

In this dissertation, we present a comparative analysis of three digital filters for chromatic dispersion compensation, an analytical evaluation of carrier phase estimation with digital equalization enhanced phase noise and a brief discussion for PMD adaptive equalization. To implement these investigations, a 112-Gbit/s non-return-to-zero polarization division multiplexed quadrature phase shift keying (NRZ-PDM-QPSK) coherent transmission system is realized in the VPI simulation platform. With the coherent transmission system, these CD equalizers have been compared by evaluating their applicability for different fiber lengths, their usability for dispersion perturbations and their computational complexity. Meanwhile, the bit-error-rate (BER) floor in carrier phase estimation using a one-tap normalized LMS filter is evaluated analytically, and the numerical results are compared to a differential QPSK detection system.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. 46 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2011:11
Keyword
Coherent transmission, chromatic dispersion, carrier phase estimation, digital signal processing
National Category
Atom and Molecular Physics and Optics Telecommunications
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-34034 (URN)978-91-7501-030-4 (ISBN)
Presentation
2011-06-08, Electrum C1, Isafjordsgatan 26, Kista, 12:06 (English)
Opponent
Supervisors
Note
QC 20110629Available from: 2011-06-29 Created: 2011-05-24 Last updated: 2011-06-29Bibliographically approved
2. DSP based Chromatic Dispersion Equalization and Carrier Phase Estimation in High Speed Coherent Optical Transmission Systems
Open this publication in new window or tab >>DSP based Chromatic Dispersion Equalization and Carrier Phase Estimation in High Speed Coherent Optical Transmission Systems
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Coherent detection employing multilevel modulation formats has become one of the most promising technologies for next generation high speed transmission systems due to the high power and spectral efficiencies. Using the powerful digital signal processing (DSP), coherent optical receivers allow the significant equalization of chromatic dispersion (CD), polarization mode dispersion (PMD), phase noise (PN) and nonlinear effects in the electrical domain. Recently, the realizations of these DSP algorithms for mitigating the channel distortions in the coherent transmission systems are the most attractive investigations.

The CD equalization can be performed by the digital filters developed in the time and the frequency domain, which can suppress the fiber dispersion effectively. The PMD compensation is usually performed in the time domain with the adaptive least mean square (LMS) and constant modulus algorithms (CMA) equalization. Feed-forward and feed-back carrier phase estimation (CPE) algorithms are employed to mitigate the phase noise (PN) from the transmitter (TX) and the local oscillator (LO) lasers. The fiber nonlinearities are compensated by using the digital backward propagation methods based on solving the nonlinear Schrödinger (NLS) equation and the Manakov equation.

In this dissertation, we present a comparative analysis of three digital filters for chromatic dispersion compensation, a comparative evaluation of different carrier phase estimation methods considering digital equalization enhanced phase noise (EEPN) and a brief discussion for PMD adaptive equalization. To implement these investigations, a 112-Gbit/s non-return-to-zero polarization division multiplexed quadrature phase shift keying (NRZ-PDM-QPSK) coherent transmission system with post-compensation of dispersion is realized in the VPI simulation platform. In the coherent transmission system, these CD equalizers have been compared by evaluating their applicability for different fiber lengths, their usability for dispersion perturbations and their computational complexity. The carrier phase estimation using the one-tap normalized LMS (NLMS) filter, the differential detection, the block-average (BA) algorithm and the Viterbi-Viterbi (VV) algorithm is evaluated, and the analytical predictions are compared to the numerical simulations. Meanwhile, the phase noise mitigation using the radio frequency (RF) pilot tone is also investigated in a 56-Gbit/s NRZ single polarization QPSK (NRZ-SP-QPSK) coherent transmission system with post-compensation of chromatic dispersion. Besides, a 56-Gbit/s NRZ-SP-QPSK coherent transmission system with CD pre-distortion is also implemented to analyze the influence of equalization enhanced phase noise in more detail.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 72 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 12:06
Keyword
coherent detection, chromatic dispersion, carrier phase estimation, quadrature phase shift keying
National Category
Telecommunications
Research subject
SRA - ICT
Identifiers
urn:nbn:se:kth:diva-94835 (URN)978-91-7501-346-6 (ISBN)
Public defence
2012-06-08, Sal/Hall C1, ICT-KTH Electrum, Isafjordsgatan 26, Kista, 10:00 (English)
Opponent
Supervisors
Note
QC 20120528Available from: 2012-05-28 Created: 2012-05-10 Last updated: 2012-05-28Bibliographically approved

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