An improved feed-forward linearisation of optical transmitter for radio over fiber system

Radio over fiber (RoF) technology provides an efficient and cost effective solution to increase the capacity of mobile communication systems and the coverage of wireless broadband communication systems. This is due to the growing data traffic and bandwidth demands. However, the performance of an RoF...

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Main Author:	Alifah, Suryani
Format:	Thesis
Language:	English
Published:	2012
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.utm.my/id/eprint/31861/1/SuryaniAlifahPFKE2012.pdf
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id	my-utm-ep.31861
record_format	uketd_dc
spelling	my-utm-ep.318612017-09-20T00:47:03Z An improved feed-forward linearisation of optical transmitter for radio over fiber system 2012-12 Alifah, Suryani TK Electrical engineering. Electronics Nuclear engineering Radio over fiber (RoF) technology provides an efficient and cost effective solution to increase the capacity of mobile communication systems and the coverage of wireless broadband communication systems. This is due to the growing data traffic and bandwidth demands. However, the performance of an RoF system is limited by the linearity of the optical transmitter that contributes to major nonlinear distortions in the links. Meanwhile, in multichannel applications, high linearity is required to avoid a channel interference due to nonlinear distortions. The feedforward linearisation technique offers a number of advantages compared to other techniques such as a broadband distortion reduction at high frequencies and simultaneous reduction in all orders of distortion. Therefore, it is suitable for linearisation of the optical transmitter. But, the existing design uses many electronic components causing difficulty for the amplitude and phase matching to achieve the optimum distortion reduction and also generate the parasitic parameter at high frequency. This thesis aims to improve the performance of the optical feedforward transmitter by reducing the electrical component without decreasing the distortion reduction performance; thus reducing the difficulty for the amplitude and phase matching and the parasitic parameter at high frequency. System characterisation is carried out by the mathematical analysis using Volterra series approach and simulation using a commercial optical design software which is validated by the practical measurement. It shows that the IMD3 reduction is good for high frequency. More than 15 dB IMD3 reduction is achieved over the carrier frequency 1.2 to 2.4 GHz using the proposed system practically. In addition, the proposed system is simpler and less sensitive in the amplitude and phase matching to obtain the optimum distortion reduction since the distortion suppression is influenced by less electrical parameters compared to other works. 2012-12 Thesis http://eprints.utm.my/id/eprint/31861/ http://eprints.utm.my/id/eprint/31861/1/SuryaniAlifahPFKE2012.pdf application/pdf en public phd doctoral Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering Alifah, Suryani An improved feed-forward linearisation of optical transmitter for radio over fiber system
description	Radio over fiber (RoF) technology provides an efficient and cost effective solution to increase the capacity of mobile communication systems and the coverage of wireless broadband communication systems. This is due to the growing data traffic and bandwidth demands. However, the performance of an RoF system is limited by the linearity of the optical transmitter that contributes to major nonlinear distortions in the links. Meanwhile, in multichannel applications, high linearity is required to avoid a channel interference due to nonlinear distortions. The feedforward linearisation technique offers a number of advantages compared to other techniques such as a broadband distortion reduction at high frequencies and simultaneous reduction in all orders of distortion. Therefore, it is suitable for linearisation of the optical transmitter. But, the existing design uses many electronic components causing difficulty for the amplitude and phase matching to achieve the optimum distortion reduction and also generate the parasitic parameter at high frequency. This thesis aims to improve the performance of the optical feedforward transmitter by reducing the electrical component without decreasing the distortion reduction performance; thus reducing the difficulty for the amplitude and phase matching and the parasitic parameter at high frequency. System characterisation is carried out by the mathematical analysis using Volterra series approach and simulation using a commercial optical design software which is validated by the practical measurement. It shows that the IMD3 reduction is good for high frequency. More than 15 dB IMD3 reduction is achieved over the carrier frequency 1.2 to 2.4 GHz using the proposed system practically. In addition, the proposed system is simpler and less sensitive in the amplitude and phase matching to obtain the optimum distortion reduction since the distortion suppression is influenced by less electrical parameters compared to other works.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Alifah, Suryani
author_facet	Alifah, Suryani
author_sort	Alifah, Suryani
title	An improved feed-forward linearisation of optical transmitter for radio over fiber system
title_short	An improved feed-forward linearisation of optical transmitter for radio over fiber system
title_full	An improved feed-forward linearisation of optical transmitter for radio over fiber system
title_fullStr	An improved feed-forward linearisation of optical transmitter for radio over fiber system
title_full_unstemmed	An improved feed-forward linearisation of optical transmitter for radio over fiber system
title_sort	improved feed-forward linearisation of optical transmitter for radio over fiber system
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2012
url	http://eprints.utm.my/id/eprint/31861/1/SuryaniAlifahPFKE2012.pdf
_version_	1747815863525834752

An improved feed-forward linearisation of optical transmitter for radio over fiber system

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