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Digital Dispersion Equalization and Carrier Phase Estimation in 112-Gbit/s Coherent Optical Fiber Transmission System
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics. (Optics & Photonics)
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 [en]
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: urn:nbn:se:kth:diva-34034ISBN: 978-91-7501-030-4 (print)OAI: oai:DiVA.org:kth-34034DiVA: diva2:418840
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
List of papers
1. Chromatic dispersion compensation in coherent transmission system using digital filters
Open this publication in new window or tab >>Chromatic dispersion compensation in coherent transmission system using digital filters
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2010 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 18, no 15, 16243-16257 p.Article in journal (Refereed) Published
Abstract [en]

We present a comparative analysis of three popular digital filters for chromatic dispersion compensation: a time-domain least mean square adaptive filter, a time-domain fiber dispersion finite impulse response filter, and a frequency-domain blind look-up filter. The filters are applied to equalize the chromatic dispersion in a 112-Gbit/s non-return-to-zero polarization division multiplexed quadrature phase shift keying transmission system. The characteristics of these filters are compared by evaluating their applicability for different fiber lengths, their usability for dispersion perturbations, and their computational complexity. In addition, the phase noise tolerance of these filters is also analyzed. (C) 2010 Optical Society of America

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-26873 (URN)000280693300106 ()2-s2.0-77954893944 (Scopus ID)
Note
QC 20101130Available from: 2010-11-30 Created: 2010-11-29 Last updated: 2017-12-12Bibliographically approved
2. Analytical estimation of phase noise influence in coherent transmission system with digital dispersion equalization
Open this publication in new window or tab >>Analytical estimation of phase noise influence in coherent transmission system with digital dispersion equalization
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2011 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 8, 7756-7768 p.Article in journal (Refereed) Published
Abstract [en]

We present a novel investigation on the enhancement of phase noise in coherent optical transmission system due to electronic chromatic dispersion compensation. Two types of equalizers, including a time domain fiber dispersion finite impulse response (FD-FIR) filter and a frequency domain blind look-up (BLU) filter are applied to mitigate the chromatic dispersion in a 112-Gbit/s polarization division multiplexed quadrature phase shift keying (PDM-QPSK) transmission system. The bit-error-rate (BER) floor in phase estimation using an optimized one-tap normalized least-mean-square (NLMS) filter, and considering the equalization enhanced phase noise (EEPN) is evaluated analytically including the correlation effects. The numerical simulations are implemented and compared with the performance of differential QPSK demodulation system. (C) 2011 Optical Society of America

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-34201 (URN)10.1364/OE.19.007756 (DOI)000290482500074 ()2-s2.0-79953851378 (Scopus ID)
Note
QC 20110610Available from: 2011-06-10 Created: 2011-05-30 Last updated: 2017-12-11Bibliographically approved
3. Normalized LMS digital filter for chromatic dispersion equalization in 112-Gbit/s PDM-QPSK coherent optical transmission system
Open this publication in new window or tab >>Normalized LMS digital filter for chromatic dispersion equalization in 112-Gbit/s PDM-QPSK coherent optical transmission system
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2010 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 283, no 6, 963-967 p.Article in journal (Refereed) Published
Abstract [en]

High bit rates optical communication systems pose the challenge of their tolerance to linear and nonlinear fiber impairments. Coherent optical receivers using digital signal processing techniques can mitigate the fiber impairments in the optical transmission system, including the chromatic dispersion equalization with digital filters. In this paper, an adaptive finite impulse response filter employing normalized least mean square algorithm is developed for compensating the chromatic dispersion in a 112-Gbit/s polarization division multiplexed quadrature phase shift keying coherent communication system, which is established in the VPI Simulation platform. The principle of the adaptive normalized least mean square algorithm for signal equalization is analyzed theoretically, and at the meanwhile, the taps number and the tap weights in the adaptive finite impulse response filter for compensating a certain fiber chromatic dispersion are also investigated by numerical simulation. The chromatic dispersion compensation performance of the adaptive filter is analyzed by evaluating the behavior of the bit-error-rate versus the optical signal-to-noise ratio, and the compensation results are also compared with other present digital filters.

Keyword
Coherent optical receiver, Digital signal processing, Chromatic, dispersion equalization, Polarization division multiplexed quadrature, phase shift keying, Normalized least mean square algorithm, Adaptive, finite impulse response filter, compensation, receiver
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-19238 (URN)10.1016/j.optcom.2009.11.011 (DOI)000274769900017 ()2-s2.0-74549132513 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
4. Frequency-domain chromatic dispersion equalization using overlap-add methods in coherent optical system
Open this publication in new window or tab >>Frequency-domain chromatic dispersion equalization using overlap-add methods in coherent optical system
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2011 (English)In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 27, no 2Article in journal (Refereed) Published
Abstract [en]

The frequency domain equalizers (FDEs) employing two types of overlap-add zero-padding (OLA-ZP) methods are applied to compensate the chromatic dispersion in a 112-Gbit/s non-return-to-zero polarization division multiplexed quadrature phase shift keying (NRZ-PDM-QPSK) coherent optical transmission system. Simulation results demonstrate that the OLA-ZP methods can achieve the same acceptable performance as the overlap-save method. The required minimum overlap (or zero-padding) in the FDE is derived, and the optimum fast Fourier transform length to minimize the computational complexity is also analyzed.

 

National Category
Telecommunications Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-35416 (URN)2-s2.0-84859220890 (Scopus ID)
Note
QC 20110629Available from: 2011-06-29 Created: 2011-06-29 Last updated: 2017-12-11Bibliographically approved
5. Phase noise influence in optical OFDM systems employing RF pilot tone for noise cancellation
Open this publication in new window or tab >>Phase noise influence in optical OFDM systems employing RF pilot tone for noise cancellation
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2011 (English)In: Journal of optical communications, ISSN 0173-4911, E-ISSN 2191-6322, Vol. 32, no 2Article in journal (Refereed) Published
Abstract [en]

For coherent and direct-detection Orthogonal Frequency Division Multiplexed (OFDM) systems employing radio frequency (RF) pilot tone phase noise cancellation the influence of laser phase noise is evaluated. Novel analytical results for the common phase error and for the (modulation dependent) inter carrier interference are evaluated based upon Gaussian statistics for the laser phase noise. In the evaluation it is accounted for that the laser phase noise is filtered in the correlation signal detection. Numerical results are presented for OFDM systems with 4 and 16 PSK modulation, 200 OFDM bins and baud rate of 1 GS/s. It is found that about 225 km transmission is feasible for the coherent 4PSKOFDM system over normal (G.652) fiber.

National Category
Atom and Molecular Physics and Optics Telecommunications
Identifiers
urn:nbn:se:kth:diva-35418 (URN)10.1515/JOC.2011.017 (DOI)2-s2.0-84859263645 (Scopus ID)
Note

QC 20110629

Available from: 2011-06-29 Created: 2011-06-29 Last updated: 2017-12-11Bibliographically approved
6. Digital compensation of chromatic dispersion in 112-Gbit/s PDM-QPSK system
Open this publication in new window or tab >>Digital compensation of chromatic dispersion in 112-Gbit/s PDM-QPSK system
Show others...
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 .

Keyword
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:nbn:se:kth:diva-35420 (URN)2-s2.0-77949413923 (Scopus ID)978-155752877-3 (ISBN)
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
7. Digital chromatic dispersion compensation in coherent transmission system using a time-domain filter
Open this publication in new window or tab >>Digital chromatic dispersion compensation in coherent transmission system using a time-domain filter
Show others...
2010 (English)In: 2010 Asia Communications and Photonics Conference and Exhibition, ACP 2010, Shanghai, 2010, 132-133 p.Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate the chromatic dispersion equalization employing a time-domain filter in a 112-Gbit/s polarization division multiplexed quadrature phase shift keying coherent system. The required tap number of the filter is analyzed from anti-aliasing and pulse broadening. The dynamic range of the filter is evaluated by using different number of taps. ©2010 IEEE.

Place, publisher, year, edition, pages
Shanghai: , 2010
Keyword
Coherent system, Coherent transmission, Dynamic range, Pulse broadening, Time domain, Chromatic dispersion, Optical systems, Photonics
National Category
Atom and Molecular Physics and Optics Telecommunications
Identifiers
urn:nbn:se:kth:diva-35422 (URN)10.1109/ACP.2010.5682798 (DOI)2-s2.0-79851494033 (Scopus ID)9781424471119 (ISBN)
Note
QC 20110629Available from: 2011-06-29 Created: 2011-06-29 Last updated: 2011-06-29Bibliographically approved

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • text
  • asciidoc
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