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Study on the Dispersive and Nonlinear Properties of Microstructured Fibers

Author: HanJiaWei
Tutor: HouShangLin
School: Lanzhou University of Technology
Course: Physical Electronics
Keywords: Optical communication Microstructure fiber Dispersion Nonlinear Fiber grating
CLC: TN929.11
Type: Master's thesis
Year: 2010
Downloads: 91
Quote: 0
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Abstract


The work of this thesis is to expand around the following items: (Item Number: 3ZS062-B25-036); Dr. Start Fund of Lanzhou University of Technology; Lanzhou University, Gansu Province Natural Science Foundation of Outstanding Young Teachers Training Program funded projects. Microstructure fiber has many features unmatched by ordinary conventional fibers. This paper focuses on the microstructure fiber dispersion and nonlinear numerical characteristics, main contents and innovations are as follows: 1. Was a regular hexagon distribution of air holes in the cladding microstructure fiber numerical simulation were calculated three diameter of the hole and the air hole pitch of the layer of air on the dispersion characteristics of the microstructured optical fiber and the nonlinear coefficient; Optimal Design of a low nonlinearity broadband dispersion compensating microstructured optical fiber, up to dispersion in the operating wavelength of 1.55μm - 3235.8ps/nm/km, can be achieved in offset 1.55μm as the center of a 100 nm range of the ordinary single-mode transmission fiber is equivalent to 190 times its own length, broadband dispersion compensation (dispersion compensation ratio is less than 0.5%), and in this broadband wavelength range to maintain the nonlinear coefficient of less than 5/W/km. Numerical analysis beyond the third layer of air holes in the cladding microstructure fiber dispersion and nonlinear characteristics. Located in different layers by adjusting the optimization of the air hole diameter and the air hole pitch more accurately design a wideband low nonlinear dispersion compensation microstructure fiber. The optical fiber can achieve single mode transmission fiber is equivalent to 190 times its own length in the 1550nm wavelength range of 100 nm broadband dispersion compensation, and can be maintained within the scope of this broadband nonlinear coefficient of less than 3/W/km . Numerical simulation mode coupling-based dual-core microstructure fiber dispersion and nonlinear its structure. The results showed that the duty ratio of the distance between the outer core and adjusting the inner and outer core and the cladding layer of air holes is formed, remove the layer of air holes in the cladding mode coupling between the inner and outer core can occur within the broadband range , resulting in a large negative dispersion. Different structural parameters improved honeycomb lattice microstructure fiber dispersion and nonlinear characteristics of the numerical simulation, analysis of the physical parameters of the dispersion D, the relationship between the nonlinear coefficient gamma their lattice parameters. The analysis results show that, by adjusting the structural parameters of the optical fiber can flexibly adjust the dispersion and nonlinear characteristics. Long period fiber grating transmission spectrum of theoretical analysis, to 1OGHz repetition rate pulsed lasers and highly nonlinear dispersion-flattened microstructure fiber supercontinuum light source, Using periodic array of metal wire tunable micro-fiber Bragg grating pressure sensing experiment measured the relationship between the transmittance spectrum and the pressure sensing pressure range and sensitivity. The experiments show that 20-60N range, pressure and linear transmittance spectrum depth reaches 0.9953 to achieve 0.5dB / N sensitivity.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications > Optical fiber communication
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