Dissertation
Dissertation > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Filtering techniques,the filter

Research on the Tunable Fabry-Perot Filter and Its Laser Application

Author SuLiQin
Tutor ShenYongXing
School Zhejiang University
Course Optical Engineering
Keywords Fiber Laser F-P Filter Tunable Laser Fiber Collimator PZT
CLC TN713
Type Master's thesis
Year 2010
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Tunable Fabry-Perot (F-P) filter has many advantages:fast tunable speed, high finesse, low insertion loss, wide tunable range, etc., so it becomes one of the critical devices in a number of fields:optical communication, laser and detecting system. In this paper, a novel tunable Fabry-Perot filter is presented with theoretical analysis and experimental research. The main content of my thesis is as following:First, the conception of F-P filter and its applications are introduced as well as the development process of tunable filters. After that, the differences on structures, principles, advantages and disadvantages of these reported tunable filters at home and abroad were summarized.Second, a novel tunable F-P filter was proposed. And the basic structure and principle of the filter were described. Due to the appearance of C-Lens fiber collimators in recent years, this kind of F-P filter can be integrated into fiber system. In this thesis, the properties of C-Lens collimator are studied by using the theory of Gaussian Optics and Matrix Optics; and also we studied the principles and characteristics of piezoelectric transducer (PZT). As a result, a wide tunable range of 50nm and finesse of 134 were achieved.Then we constructed a ring fiber laser with this tunable filter, and a tunable range of 32.5nm of lasing output was obtained. The lasing wavelength ranges from 1032.82nm to 1065.32nm. The maximum power is 2.72mW, and the linewidth is 0.078nm.Finally, the factors associated with the stabilization of the filter and fiber laser were analyzed. In order to solve these problems, methods that might be available to increase the stabilization were discussed.

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