Item – Theses Canada

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OCLC number
77525123
Author
Park, Jongwoon,1975-
Title
Modeling, simulation and performance optimization of wideband semiconductor optical amplifiers.
Degree
Ph. D. -- McMaster University, 2005
Publisher
Ottawa : Library and Archives Canada = Bibliothèque et Archives Canada, [2006]
Description
2 microfiches
Notes
Includes bibliographical references.
Abstract
Numerical models are indispensable to predict a device performance and grasp the underlying physics in the operation of optoelectronic devices. For the accurate simulation of broadband semiconductor optical amplifiers (SOAs), the amplified spontaneous emission (ASE) noise spread over the entire spectrum should be incorporated in numerical models, demanding tremendous computational efforts. As such, a well-balanced model between accuracy and computational efforts is highly desired. A number of powerful models established in literature have been reviewed. The classical rate equation model is the simplest but least accurate. The full semiconductor Bloch equations are the most complete and accurate, but computationally expensive and furthermore hard to implement. The mixed frequency-time-domain traveling wave (TW) model is such a case in point. The incorporation of the ASE noise into the model is facilitated by a spectrum slicing technique. Three different frequency-time-domain models named as the full-power, half-wave, and full-wave models have been implemented. A comparison among them has been made to shed light on some of their respective salient features and provide useful guidelines for their applications to the modeling of optoelectronic devices. Of those models, the full-wave model is the most realistic as it always describes physically correctly what happens in reality. The mixed frequency-time-domain model has been utilized for the numerical simulation and performance optimization of conventional SOAs and gain-clamped (GC-) SOAs based on the first-order distributed Bragg reflector (DBR) or the second-order distributed feedback (DFB) gratings. Through such studies, however, it has been found that the internal lasing mode for gain clamping generated inside a SOA by those gratings always degrades the signal gain and noise performance. To overcome them, a new tandem configuration has been introduced, in which a SOA and a DBR laser are integrated. Such an integrated structure provides superior performances such as high saturation power and fast gain dynamic without compromise on the signal gain. The effective Bloch equation model has also been implemented to identify the nonlinear phenomenon such as crosstalk among different signal channels in SOAs, which can hardly be treated accurately by other existing models.
ISBN
0494042699
9780494042694