Decoupling efficiency of multiple coupled photonic crystal waveguides

Tianbao Yu; Lingjuan He; Jun Zhang; Liguang Fang; Ping Wu

doi:10.1117/12.855655

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2 December 2009 Decoupling efficiency of multiple coupled photonic crystal waveguides

Tianbao Yu, Lingjuan He, Jun Zhang, Liguang Fang, Ping Wu

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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, and Ping Wu "Decoupling efficiency of multiple coupled photonic crystal waveguides", Proc. SPIE 7631, Optoelectronic Materials and Devices IV, 763126 (2 December 2009); https://doi.org/10.1117/12.855655

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