A way achieving ultracompact directional coupler based on photonic crystal waveguides

Abstract

Abstract:

In a directional coupler based on photonic crystal waveguides (PCWs), the coupling coefficient can be increased by reducing the refractive indexes of the rods between the two coupled PCWs. Accordingly, a shorter beating length and ultracompact device can be achieved. The distribution of odd modal intensity is nearly unaffected, but the distribution of the even modal intensity shifts to higher frequencies when the indexes are reduced. Furthermore, the beating length slope increases for a fixed frequency range, and this technique allows smaller channel spacing and more signal channels for a given total devices length. The finite-difference time-domain method is used to validate the behavior that the beating length can be shortened by reducing the refractive index of the modified rods.

Key words: optical communication, photonic crystal waveguide, directional coupler, the finite-difference time-domain method, wavelength multiplexers /demultiplexers

CLC Number:

O439

WU Jiang-Hai. A way achieving ultracompact directional coupler based on photonic crystal waveguides[J]. J4, 2009, 26(4): 494-498.

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