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Performance of MB-OFDM ultra-wideband signals over fiber transmission using a low cost electro-absorption modulator integrated laser

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Performance of MB-OFDM ultra-wideband signals over fiber transmission using a low cost electro-absorption modulator integrated laser

Sui, Chengwen (2010) Performance of MB-OFDM ultra-wideband signals over fiber transmission using a low cost electro-absorption modulator integrated laser. Masters thesis, Concordia University.

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Abstract

The performance of multi-band (MB) orthogonal division frequency multiplexing (OFDM) ultra-wideband (UWB) over fiber transmission using a low cost electro-absorption modulator integrated laser (EML) is investigated in details. Various parameters such as fiber length, bias voltage, bias current and temperature of the EML are systematically evaluated to illustrate the effects on the performance of this Radio over Fiber (RoF) system. It is found that for the considered EML, the optimum normalized input (modulation) power is {598}0.068 at bias voltage of 0.26 V. When modulation voltage is low the performance is mainly limited by signal to noise ratio, but mainly limited by EML response nonlinearities when modulation power is high. Theoretical analysis of the effect of fiber dispersion and EML response nonlinearities on system performance is carried out considering amplitude and phase distortion. Experiments are conducted and verified by our theoretical analysis, and good agreement between the experiments is obtained. The effect of fiber chromatic dispersion induced laser phase to intensity noise conversion or relative intensity noise (RIN) on performance is investigated in terms of laser intrinsic RIN, laser linewidth, fiber dispersion and carrier frequency. The effect of nonlinearities of the EML on the OFDM subcarriers for MB-OFDM UWB over fiber system is investigated in terms of the intermodulation distortion (IMD) products. In addition, adjacent channel power ratio (ACPR) is also analyzed and calculated in order to abide with ECMA standard and have less interference to coexisting channels.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering
Item Type:Thesis (Masters)
Authors:Sui, Chengwen
Pagination:xvii, 78 leaves : ill. ; 29 cm.
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Electrical and Computer Engineering
Date:2010
Thesis Supervisor(s):Zhang, X
ID Code:979386
Deposited By: Concordia University Library
Deposited On:09 Dec 2014 17:58
Last Modified:18 Jan 2018 17:49
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