28 January 2006 Photonic crystal waveguide directional coupler based on adiabatic coupling
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Proceedings Volume 6025, ICO20: Optical Communication; 602506 (2006); doi: 10.1117/12.666986
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China
Abstract
An optimal design of Photonic crystal waveguide (PCW) directional coupler (DC) with adiabatic coupling is presented in this paper. Planar wave expand (PWE) method and FDTD method are used to analyze and optimize PCW-DC. It is shown that use this PCW-DC can achieve efficient transmission ratio in cross state, bar state and power division state at different coupling length. The simulation results show that the coupling ratio can be higher than 90% in some selective wavelength in these states. With the help of adiabatic coupling and bent PCW, the coupling coefficient of two parallel SMFs whose distance from each other at standard interval of 125μm can be higher than 90%. This also suggests that this device can realize a very efficient add/drop filter device which can be used in WDM system.
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Ningfeng Bai, Jingbao Xiao, Xu Liu, Mingde Zhang, Xiaohan Sun, "Photonic crystal waveguide directional coupler based on adiabatic coupling", Proc. SPIE 6025, ICO20: Optical Communication, 602506 (28 January 2006); doi: 10.1117/12.666986; https://doi.org/10.1117/12.666986
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KEYWORDS
Waveguides

Directional couplers

Dielectrics

Photonic crystals

Dielectric polarization

Finite-difference time-domain method

Dispersion

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