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Title: Numerical study of semiconductor optical amplifiers for passive optical networks
Author: Liu, Lin
ISNI:       0000 0004 2746 5270
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 2013
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The motivation of this thesis is to better understand the characteristics of Semiconductor Optical Amplifiers (SOAs) and their use in the Passive Optical Networks (PON), particularly in packet equalisation. Following an introduction to physical principles and structure of SOAs the architecture of optical communication system especially PON is explained. The basic characteristics and key applications of SOAs are then discussed. In this study, the modelling of SOAs has been achieved at both system and device levels. In terms of high efficient system level SOA model, both co-propagation and counter-propagation models are employed to study the cross gain modulation of SOAs. The co-propagation system model has also been used to study the gain compression effect of SOAs. The direct modulation frequency response of a SOA is also investigated numerically. Alternatively, the detailed device level SOA model, which includes a wideband material gain coefficient taking the intraband relaxation effect into account and an efficiency-improved steady state algorithm, is proposed to study the DC characteristics of SOAs. Based on the detailed device level SOA model, the numerical model for the adjustable gain-clamped SOA (AGC-SOA) has been proposed to investigate both the steady state operation and the case where the gain of the AGC-SOA is dynamically modulated. Through theoretical analysis and experimental investigation, this study demonstrated that the gain of AGC-SOA would be dynamically modulated in response to the changes in packet amplitude in PONs.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral