Design and analysis of fiber optic gratings

Pao Yue-kong Library Electronic Theses Database

Design and analysis of fiber optic gratings

 

Author: Yu, Tin-fu
Title: Design and analysis of fiber optic gratings
Degree: M.Sc.
Year: 1999
Subject: Fiber optics
Diffraction gratings
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electrical Engineering
Pages: v, [81] leaves : ill. (chiefly col.) ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1485424
URI: http://theses.lib.polyu.edu.hk/handle/200/444
Abstract: In recent decades, Fiber Optic Gratings have found their applications in various areas such as telecommunications, electrical power industry, medical usage and sensors for strain / temperature measurement. Their performance and applicability are actually depending on the design of the gratings' parameters like gratings length, fiber material, grating strength, chirping shape, apodization, etc. However, no formal and explicit relationships between the gratings performance and the design of their parameters have been established so far. In this thesis, the steady state performance of Fiber Optic Gratings against different combinations of their parameters will be analyzed by means of computer simulations (the "IFO_Gratings 2.0" - Integrated and Fiber Optical Gratings Design software, will be utilized throughout the study, with details discussed in the chapter "Theory" of this report). The use of computer simulation is essential and critical to the analysis owing to the great complexity of the mathematical formulations involved. The simulation results will be consolidated and the relationships between the grating performance and the grating parameters will be summarized and presented in this report. The results obtained are used for designing Fiber Optic Gratings of specific reflection spectrum (i.e. a sawtooth waveform), which will form the basis for a particular fibre grating sensor system (i.e. a multiplexed dynamic strain sensor system). Different approaches have been tried and the optimal one is chosen. The design is novel and the desired performance is principally achieved. Improvement opportunities are identified and the details will be discussed in the "Discussions and Conclusions" of this report.

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