Dissertation > Excellent graduate degree dissertation topics show

Design and Study of Rectangular Wave Filter and Beam Splitters Based on Photonic Crystals

Author: ChenShuWen
Tutor: FangAnAn；DingJie
School: Nanchang University
Course: Electronics and Communication Engineering
Keywords: photonic crystals impurity bands photonic atomic coupling photonic crystal waveguides directional coupler beam-splitter uniform energy distribution
CLC: TN713
Type: Master's thesis
Year: 2011
Downloads: 26
Quote: 0
Read: Download Dissertation

Abstract


The main research contents of this dissertation are as follows:1. Firstly, the realization of rectangular wave filter based on the photonic crystals impurity band has been investigated by means of transfer matrix method. The formation of the quasi-flat bands can be achieved not only by choosing different materials with different refractive indexes but also by adjusting the structure parameters of photonic crystal(PC) itself. So the realization has a large choice range. The dissertation gives a detailed theory analysis and explanation about the rectangular wave formation mechanism. The processing when two PC atoms(signal defect) are coupled to form a PC molecule(two coupled defects) is analyzed in detail. It is found that the ratio of the PC atom linewidth to the PC molecule linewidth plays an important role in the forming of quasi-flat bands. The physical picture about the rectangular wave is also clearly illustrated in this article.Group velocity delay in optical communication will directly lead to ultra-short pulse signal distortion or attenuation. From this perspective, obtaining a relatively quasi-flat bands is very important for the ultra-short transportation without any distortion in optical communication.2. Directional coupler in optical communication can be constructed by putting five photonic crystal waveguides together. The propagation of the optical field entering this system symmetrically is analyzed numerically on the basis of self-imaging principle.1×3 beam splitter, which the length can lowly be 14.26μm. is designed by using this structure. By symmetrically tuning the effective refractive index of two dielectric rods in the coupler, accordingly inducing the redistribution of the electric field, uniform or free energy split can be achieved. By asymmetrically tuning the effective refractive index of one dielectric rod in the coupler, free energy split can also be achieved.Due to the ultracompact size and the free energy split of the output power, the device has extensive practical value in future optical communication photonic integrated circuits.

Related Dissertations

  1. One -dimensional photonic crystal tunable optical and magneto-optical properties of,O734
  2. The use of nano-imprint technology to prepare photonic crystal LED research,TN312.8
  3. Multi-quantum dot photonic crystal defect layer optical switches based on,TN929.1
  4. 360 ° phase shifter ESC Design and Optimization,TN623
  5. Direction of the high degree of flatness and high broadband directional coupler design research,TN622
  6. Differences between two-dimensional triangular lattice photonic crystal waveguide microwave model experiments and simulation studies CIP,TN252
  7. One-dimensional photonic band gap structure Numerical Methods,O734
  8. The Filter Properties of Photonic Crystal and Optimization Design of a Photonic Crystal Beam Splitter,O734
  9. Wideband microwave NDT hardware systems research,TP274.5
  10. The Design of Microstrip Directional Coupler with Automatic Directivity Tuning,TN622
  11. 40GHz power amplifier Automatic Test System,TN722.75
  12. Research of the Illimeterwave High Power Amplifier Based on Solid State Power Synthesis Technology,TN722.75
  13. The Study for the Key Techniques of Silicon Optical Waveguide and Its Device Structure,TN252
  14. Basic Studies of Magneto-Optical Waveguide Devices,TN252
  15. Ka-band solid-state pulsed power amplification technology,TN722.75
  16. LTE Design and Research of passive RF components,TN929.5
  17. The WCDMA system Passives the developed,TN929.533
  18. Analysis and Design of Stripline Directional Coupler,TN622.4
  19. Investigation of High-speed Electro-optic Modulator Based on Polymer,TN761
  20. Application of Sub-Wavelength Structure in Microwave Circuit,TN61
  21. Study of Polymer-Integrated-Waveguide-Based Demultiplexer,TN814

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Filtering techniques,the filter
© 2012 www.DissertationTopic.Net  Mobile