Dissertation > Excellent graduate degree dissertation topics show

Study on Characteristics of Photonic Crystal Fibers and Its Application in Optical Filter

Author: ZhuYing
Tutor: MaXiuRong
School: Tianjin University of Technology
Course: Communication and Information System
Keywords: Photonic crystal fiber Full-vector finite-element method Birefringence Optical filter
CLC: TN929.11
Type: Master's thesis
Year: 2010
Downloads: 48
Quote: 0
Read: Download Dissertation

Abstract


In this dissertation, We use a full-vector finite-element method to theoretically study birefringence and chromatic dispersion characteristic of photonic crystal fiber, and analyse the change of birefringence and chromatic dispersion with the hole pitch and hole shape. With this, we design a PCF with birefringence approximatively square to the operation wavelength. And then build up a equal channel spacing Sagnac filter based on this PCF.The details are described as follows:First, a kind of Hi-Bi PCF with in-cladding elliptical hole is proposed. The phase birefringence, group birefringence and chromatic dispersion characteristic in such a PCF are studied using a full-vector finite-element method. Numerical result shows that its phase birefringence with magnitude of order of 10-3 and the negligible group birefringence near 1550nm can be realized. Moreover, a high phase birefringence and low group birefringence PCF with more than 400nm flattened dispersion bandwidth in the near 1550nm communications window is numerically demonstrated.Second, phase birefringence and chromatic dispersion of high birefringent photonic crystal fiber with introducing four small air holes near the core into the cladding is investigated by using a full vector finite-element method. Numerical result shows that its phase birefringence can be of magnitude of order of 10-3 at long wavelength span. Base on which, we fit the curves of different structural parameters PCF’s birefringence as a function of wavelength using quadratic polynomial, in order to find the best structural parameters in quadratic polynomial. We finally aquire the PCF, the absolute value of first-order term of quadratic polynomial is smaller than the second-order term by a seven-order of magnitude, which indicates that designed PCF with birefringence approximatively square to the wavelength; Moreover, By optimizing its structural parameters, a PCF with near zero and broad-band flat dispersion over 780 nm wavelength range can be designed, of which the absolute value of the dispersion coefficient change|△＜|±D2.5ps/km/nm.Third, phase birefringence and group birefringence of elliptical-hole cladding PCF with introducing four small air holes near the core is investigated by using a full vector finite-element method. Numerical result shows that the birefringence of this PCF is induced by factors of elliptical air hole cladding and introducing four small air holes near the core together; Following, we move the location of the innermost cladding air holes to the inside and outside by 5%∧, and make a numerical simulation of the model after location fluctuation of the air hole.Based on the simulation results, we can deduce that the the inevitable location fluctuation of the air hole in the the production process will not affect the characteristics of the fiber birefringence.Fourth, the paper presents a method to design a optical filter based on Sagnac interferometer with equal channel spacing.The filter is achieved by designning a photonic crystal fiber which phase birefringence is square to wavelength. We have made a numerical simulation of the Sagnac filter. the channel spacing of the proposed filter only changes by 0.03nm, about one order of magnitude less than those constructed with conventional high birefringent fibers (HBFs),basically realized the equal channel spacing Sagnac filter.

Related Dissertations

  1. Research on the High Birefringence Photonic Crystal Fiber Loop Mirror Comb Filter,TN713
  2. Research on the Spectral Characteristics and Sensing Applications of Photonic Crystal Fiber Grating,TP212
  3. Research on Sensing with High Birefringent Photonic Crystal Fiber,TP212
  4. Study on the Influence of Various Defects on the Characteristics of Infrared Photonic Crystal Fiber,TN253
  5. Studies on Manufacture of Photonic Crystal Fiber Combiners,TN253
  6. Implementing Optical Wavelet Filter Based on 4F System,TP391.41
  7. Research on the Polarization Error and Key Component of Optical Fiber Gyroscope,TN253
  8. Fusion Splice of Photonic Crystal Fiber and Single Mode Fiber,TN253
  9. Studies on Controlled Air Hole Collapse in Photonic Crystal Fiber,TN253
  10. Studies on Characters and Applications of Tapered Optical Fibers,TN253
  11. Research on Spatial Spectrum Analysis and Information Extraction of the High-spatial-frequency Object with the Strong Background Light,O439
  12. Study on the Environmental Stress Cracking Behavior of Polycarbonate Injection Molded Products,TQ320.662
  13. Research on Transmission Characteristics of Dielectrically Chiral Photonic Crystal Fiber with Bandgap,O436
  14. Surface Plasmon Resonance Effect Based on Supercontinuum Source,TN241
  15. Research on the Confinement Loss and Dispersion in W-type Photonic Crystal Fibers,TN253
  16. Research on Electrically Controlled Double Refraction Non-Scratch Diffraction Gratings with Different Structures,TN15
  17. Reflection and Transmission of Extraordinary Beam at Crystal Surfaces,O734
  18. The Study of Multi-wavelength and Narrow-line-width Fiber Laser Based on Polarization Effects,TN248
  19. Research on Fiber Grating Sensing and Key Technology of Sagnac Loop,TN253
  20. Research on Sensing Properties of Photonic Crystal Fiber Grating,TN253

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications > Optical fiber communication
© 2012 www.DissertationTopic.Net  Mobile