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Research of Optical Add-Drop Multiplexer Based on Fiber Bragg Grating

Author: LuoHuaDong
Tutor: HuangYongLin
School: Nanjing University of Posts and Telecommunications
Course: Optical Engineering
Keywords: Fiber grating OADM Circulator Mach - Zehnder interferometer Sampled grating
CLC: TN253
Type: Master's thesis
Year: 2012
Downloads: 25
Quote: 0
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Abstract

In recent years, with the rapid development of optical communication network, optical add-drop multiplexer (OADM) as one of the key components in WDM optical network, has been the focus of attention at home and abroad. OADM structure of the program, which is based on fiber grating OADM its insertion loss is low, the structure is simple and has nothing to do with the polarization characteristics in future optical transport network will have broad application prospects. Fiber grating OADM study OADM OADM based on fiber grating and Mach - Zehnder interferometer based on fiber gratings and circulators, completed work: 1, the first of several common OADM The structure gives a brief introduction, the recent years, the development and application of fiber grating. Then start from the fiber photosensitivity and the optical properties of the grating, the detailed derivation of the coupled mode theory, some important conclusions derived general fiber Bragg grating reflectivity formula, highlights for segment analysis of fiber grating transmission matrix theory, then discuss several important apodization brief simulation analysis of their similarities and differences, fiber grating tuning technology. Three OADM structure based on fiber gratings and circulators do the research and simulation. First single tunable fiber gratings and two circulators OADM (I type) structure analysis and simulation experiments; followed by design (Ⅱ type), and the structure of the novel OADM based on the four fiber grating cascade and circulators full load and under-load, respectively, do two sets of simulation experiments, the results show that the addition to the successful realization of the four wavelengths simultaneously download below capacity (two wavelengths download) run-time than full capacity to reduce crosstalk about 2dB; final novel OADM based on fiber grating and 11-port circulators (Ⅲ type), the simulation results show III type OADM significantly reduce system losses than Ⅰ and type Ⅱ OADM, only about 0.5dB. 3, OADM based on fiber grating and Mach - Zehnder interferometer. OADM based on uniform fiber grating and Mach - Zehnder interferometer Mach - Zehnder interferometer output characteristics of the first theoretical analysis, theoretical analysis focuses on the spectral efficiency and isolation devices, OADM most good structure parameters, followed by the use of these parameters to do the numerical simulation of its output characteristics, its performance through simulation experiments. Secondly, the proposed the OADM new structure sampled grating-based Mach - Zehnder interferometer, the subsequent structure theoretical derivation and numerical simulation, 16 channel download spectrum and download 29 channel spectrum, and application of apodization technology this two download spectrum optimization.

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