2 December 2009 Decoupling efficiency of multiple coupled photonic crystal waveguides
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Proceedings Volume 7631, Optoelectronic Materials and Devices IV; 763126 (2009) https://doi.org/10.1117/12.855655
Event: Asia Communications and Photonics, 2009, Shanghai, Shanghai , China
Abstract
We investigate decoupling characteristics and efficiency of multiple coupled photonic crystal waveguides (M-CPCWs) using coupled mode theory on the basis of self-imaging principle. The three-, four- and eight-CPCWs are selected as the typical structures to discuss the general characteristics of the M-CPCWs. It is found that around the frequency where the multiple guided modes are almost degenerate, which leads to that the power transfer in the M-CPCWs is eliminated for any entrance. The frequency region for decoupling is insensitive to the number of coupled waveguides with the extinction ratios higher than -15dB. An optimization way by introducing a defect mode is utilized to enhance the decoupling efficiency. The simulation results are based on the finite-difference time-domain method. The decoupling of the M-CPCWs exhibit many advantages and may have practical applications in photonic integrated circuits.
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Tianbao Yu, Lingjuan He, Jun Zhang, Liguang Fang, Ping Wu, "Decoupling efficiency of multiple coupled photonic crystal waveguides", Proc. SPIE 7631, Optoelectronic Materials and Devices IV, 763126 (2 December 2009); doi: 10.1117/12.855655; https://doi.org/10.1117/12.855655
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