Fast Analysis And Emulation Of Transmission Property Of Non-uniform Fiber Bragg Gratings

The fiber grating is a kind of new optoelectronic of passive components, which was quickly developed and widely applied in the areas of optical fiber communication and optical fiber sensing in recent decades. Optical fiber grating has many unique features, such as little size, light weight, flexible, passive, wavelength selective, wide bandwidth, small dissipation, polarization insensitive, unaffected by nonlinear effect and easy to connect with fiber optic system etc., which is one kind of optical passive components which has wide application prospects.This article studies the sorts deeply, the fabrication methods and the application of the fiber gratings, analyzes the spectral characteristics of chirper fiber gratings and Gaussian-apodization FBGs which are both non-uniform fiber gratings, based on a new theory–FMC (Fourier mode coupling) theory. The analysis result provides theory basis and possibilities for actual application of fiber gratings; we analyze the influence of various structural parameters on spectral characteristics through analog simulation, and obtain some useful conclusions from it so as to guide how to design good performance fiber grating products meeting several specific requirements.The research works in the dissertation are summarized as follows:To summarize the classification and fabrication methods of the fiber Bragg gratings, the development and application status of the fiber Bragg gratings, compare the advantages and disadvantages of the several fabrication methods, describe the application of fiber Bragg grating in communication and sensor field and the requirements of fiber grating in DWDM system.To deduce the FMC theory that applied to the analysis of fiber grating characteristics deeply, compare the advantages and disadvantages of the transfer matrix method and Runge-Kutta method in the analysis of uniform fiber grating.To focus on the Fourier mode coupling (FMC) theory, and using the FMC theory get the analytic solution of chirped-optical FBGs and Gaussian-apodization FBGs. The spectrum of these FBGs based on this analytic solution is simulated and compared with those based on transfer matrix method. The high efficiency and the superiority in analysis the non-uniform fiber gratings is perfectly ensured, The analytic solution is suitable for fast analysis or real-time control during the course of design and manufacture of the Gaussian-apodization FBGs or the masks.