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Design and Analysis of Delay Lines Based on Photonic Crystal Coupled Cavities

Bayat, Mina | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40553 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Khorasani, Sina
  7. Abstract:
  8. In the recent years, photonic crystal (PhC) devices vastly have been paid attention due to their ignorable loss, very low group velocity, flexibility in shape and dimension.In this thesis a PhC coupled cavity ring known as superresonator is introduced and its properties and applications is studied. Also modes of the structure are extracted through both coupled-resonator model and FDTD method, and two of its application is described and studied. Add-drop filter is one of the essential devices in WDM systems. First, an application of superresonator in designing add-drop filters is explained and a novel filter based on the superresonator is introduced and analyzed by FDTD and coupled mode theory. It is shown that spectral responses of both methods are in agreement with each other, and transmission efficiency of the structure is %96. In the other hand, results shown that the transfer function of superresonator filters are zero-pole. This is in contrast with CROW structures which are all-pole. Number and location of zeros of the novel filter is controllable through designing addition it is shown that this structure has more degree of freedom in choosing design parameters in comparison whit previous ones. For designing favorable spectral shape equivalent electric circuit model for the structure is also suggested.
    The delay in the superresonator is calculated based on the coupled super model and then the other application of the superresonator is explained in designing of delay element. So the novel superresonator based delay element is introduced and analyzed by the FDTD method. The resulted delay of suggested structure is 1.8 times greater than the same structure without any superresonator, indicating a very good delay that can be achieved by such structures.
  9. Keywords:
  10. Photonic Crystal ; Delay Lines ; Photonic Crystal Cavity ; Add/Drop Filter

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