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Study on Design and Tuning Methods of Sampled Fiber Gratings with Special Structure

Author: ZhangPengJie
Tutor: LiuYan
School: Beijing Jiaotong University
Course: Communication and Information System
Keywords: Amplitude sampling Phase sampling Simulated annealing algorithm Wavelength tuning Temperature sensitizing package
CLC: TN253
Type: Master's thesis
Year: 2010
Downloads: 57
Quote: 0
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Abstract


Fiber Bragg grating (FBG) as an important optical passive devices, optical fiber communications, fiber optic sensing and optical information processing with a wide range of important applications. With the development of the dense wavelength division multiplexing (DWDM) technology, sampling tunable characteristics because it has a multi-channel reflection peak of the fiber grating, in the multi-wavelength tunable narrowband laser, multi-wavelength tunable narrowband filter, dynamic dispersion compensation, and other aspects play an increasingly important role, has wide application prospect and research value. Sampled fiber grating amplitude sampled fiber grating and phase can be divided into different sampling function sampled fiber grating amplitude sampled fiber grating theoretical and experimental research has been more mature, and has been widely applied to various fiber grating devices based on the amplitude of the sampled the field of fiber-optic communication, fiber optic sensing. Phase-sampled fiber grating because of its complex phase change requires very high accuracy of the experiment, the phase sampling fiber grating development is relatively slow, but it is precisely because of the diversity of the grating phase change, phase sampled fiber grating exhibit novel spectral characteristics in the multi-channel filters, dispersion slope compensator, etc. has broad application prospects. This article focuses on the sampled fiber grating has a special structure, such as phase sampling, and amplitude of the combined phase the sampled grating theoretical analysis and numerical simulation, and the sampled grating tuning method study, the main results obtained are as follows: (1) In order to improve Matrix Sample Peak rendering Sinc function distribution of the envelope and suppressed sidelobe, respectively, the introduction of the Sinc sampling function and high the Menschel toe function to optimize the reflection spectrum; then analyze an amplitude phase sampled fiber grating binding conditions, without changing the sampling period , by introduction of a certain size in the between every two amplitude sampling phase shift reducing reflection channel spacing is reached, dense object of the number of channels. (2) study the theoretical basis of the phase-sampled fiber grating, and introduces the simulated annealing algorithm to optimize the phase fiber grating phase distribution in the shorter length of the grating and the lower refractive index modulation strength conditions, has 32 reflection peak, reflecting channel spacing of 0.8nm phase sampled fiber grating reflection spectrum characteristics. (3) In a detailed comparative analysis based on the advantages and disadvantages of the common fiber grating wavelength tuning, analysis of an improved sampled fiber grating wavelength temperature tuning program, the program can be achieved by changing the length of the packaging materials of sampling fiber grating temperature sensitivity adjustment, and without the grating part adhesive, to avoid grating reflection spectrum chirp contraction caused due to uneven curing adhesive, multi-wavelength, quasi unchirped linear high temperature tuning effect .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
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