科研之友
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摘要
In this paper, an all-optic add/drop filter, having nearly squared flat top spectral characteristic, is designed using 1D photonic crystal with defects. Estimated defects are incorporated here into the Photonic band gap (PBG) structure through proper extension in dielectric layers of specific unit cells. Performance of the flat top filter is analyzed using transfer matrix method. The analysis reveals that the distribution of the introduced defects controls the transmission characteristics of the structure. To achieve flat top response, the general condition regarding distribution of defects within the PhC is derived. Analysis is also carried out to ensure the optimum design for ripple free pass band. Width of the flat top pass band is further tailored to support shifts of signal wavelength in an allotted channel within its permissible limit, which is 14 nm as specified by ITU-T Recommendation G.694.2 for a coarse wavelength division multiplexing (CWDM) system.
- 出版日期2010-7
