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29 September 2005 Analysis of photonic crystal coupler tolerance using coupled mode theory
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Photonic Crystals (PCs) are a promising technology for the realization of high-density optical integrated circuits. Photonic Crystal-based couplers have been proposed as a compact means of achieving Wavelength Multiplexing and Demultiplexing. However, the performance of such devices can be limited by fabrication imperfections such as rod size non-uniformities. In this paper, Coupled Mode Theory (CMT) is applied in order to study the implication of the variation of the size of the rods. CMT can provide a useful insight in the effect of size variations, and unlike other numerical methods such as the Finite Difference Time Domain (FDTD), it does not require excessive computational time. Using CMT, the relation between the size non-uniformities and the coupler's insertion loss and extinction ratio is analyzed. It is shown even a small size variation of the order of 2%-3% can degrade the performance of the device.
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Thomas Kamalakis, Ioannis Neokosmidis, and Thomas Sphicopoulos "Analysis of photonic crystal coupler tolerance using coupled mode theory", Proc. SPIE 5956, Integrated Optics: Theory and Applications, 595603 (29 September 2005);

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