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Phase noise influence in optical OFDM systems employing RF pilot tone for noise cancellation
Acreo AB, Electrum 236, Kista, Sweden.
Stanford University, USA.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Optics (Closed 20120101). (Optics & Photonics)
KTH, School of Information and Communication Technology (ICT), Optics and Photonics (Closed 20120101), Optics (Closed 20120101).
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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.

Place, publisher, year, edition, pages
2011. Vol. 32, no 2
National Category
Atom and Molecular Physics and Optics Telecommunications
Identifiers
URN: urn:nbn:se:kth:diva-35418DOI: 10.1515/JOC.2011.017Scopus ID: 2-s2.0-84859263645OAI: oai:DiVA.org:kth-35418DiVA: diva2:428116
Note

QC 20110629

Available from: 2011-06-29 Created: 2011-06-29 Last updated: 2017-12-11Bibliographically 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)
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Supervisors
Note
QC 20110629Available from: 2011-06-29 Created: 2011-05-24 Last updated: 2011-06-29Bibliographically approved

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