Date of Award

1-1-2000

Thesis Type

Masters

Document Type

Thesis

Divisions

Faculty of Science

Department

-

Institution

Universiti Malaya

Abstract

This thesis presents the research work carried out on the development and analysis of single wavelength EDFL and multiple wavelength EDFL. Two types of single wavelength EDF ring laser were studied namely a fixed signal wavelength system and a tuneable signal wavelength system. However, emphasis was given to the first case. The analyses made, were based on the following parameters: pump and signal stability, pump power, reflectivity, EDF length and cavity loss. The influence of each cavity component such as isolator, polarisation controller, attenuator and tuneable filter were also investigated and reported here. Only one type of multiple wavelength EDFL was studied. It was achieved using a multiple cavity approach and a two-ring system was constructed for this study. It is proposed as a two wavelength source by incorporating an output coupler to each ring instead of single common output port. The importance of analysis on the gain matching requirement (loss allowance and gain difference) for simultaneous multiple lasing is emphasised since no finding has been clearly reported and discussed on this matter. In this study the simultaneous tuning range increases to 50nm without any limitation in the wavelength spacing was achieved. The characteristics, elaborated in the multiple wavelength system are tuning range, spacing between the signals, output power, optimum reflectivity for both signals, optimum output power for both signals and threshold pump power. The effect of back reflection was also investigated and was found that fibre laser systems are unaffected by the back reflected signals.

Initial

snms

Additional Information

Dissertation (M.A) -- Faculty of Science, Universiti Malaya, 2000.

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