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Design and analysis of spreading code and transceiver architectures for optical CDMA networks

Karbassian, Mohammad Massoud (2009)
Ph.D. thesis, University of Birmingham.

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In this thesis, firstly we have reviewed both previous and current state of optical CDMA (OCDMA) technologies. Search for appropriate spreading codes is one of the main challenges of OCDMA applications and hence is an important topic which is heavily addressed in the literature. Existing codes have restrictions on code-lengths, weights and correlation properties where the number of generated codes is severely limited. Secondly, we have paid a particular attention to proposing a novel spreading code, hereby referred to as Double Padded Modified Prime Code (DPMPC) which suppresses the multiple-access interference and also enhances the network capacity. Then, we have applied the DPMPC to both coherent and incoherent time-spreading OCDMA transceivers and analysed their overall performances. We have also proposed novel transceivers which are power-efficient, simple and able to accommodate great number of simultaneous users. Accordingly, an advanced two-dimensional frequency-polarization modulation for OCDMA has been introduced, for the first time, to elevate the system security as well as the performance. Finally, the application of OCDMA in the passive optical network leading to the OCDMA-PON architecture has been established including the optical line terminal and network units. Since Internet protocol is currently the dominant network protocol, IP-over-OCDMA network node configuration ha

Type of Work:Ph.D. thesis.
Supervisor(s):Ghafouri-Shiraz, H
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Electronic, Electrical and Computer Engineering
Keywords:optical CDMA, optical network, prime codes, multiple access interference
Subjects:TK Electrical engineering. Electronics Nuclear engineering
QA75 Electronic computers. Computer science
Institution:University of Birmingham
ID Code:285
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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