15 September 2004 Waveguide couplers formed by tapered photonic crystal fiber
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At the present paper the photonic crystal coupler of an optical fiber, which has been made by the adiabatic tapering of the optical fiber based on the photonic crystal is presented. These couplers are characterizing by material refractive index changing in a spatial direction along of the wave propagation direction. In our investigation an effective refractive index model of two-dimensional photonic crystal was used. This model allows analyzing the waveguide structures, which work on the effective index waveguiding in a defect of the photonic crystal. Also this model allows reducing the investigation time by reducing the three-dimensional numerical analysis of the coupler to the two-dimensional consideration. The effective refractive indexes of such couplers were numerically found. Using this model the field distribution in these couplers were investigated and were calculated its losses. It was shown that the couplers with smaller input diameter and the fixed output diameter have smaller losses.
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Igor A. Sukhoivanov, Roberto Rojas-Laguna, Amparo Andrarde-Lucio, Andriy V. Dyogtyev, Pavel S. Ivanov, "Waveguide couplers formed by tapered photonic crystal fiber", Proc. SPIE 5450, Photonic Crystal Materials and Nanostructures, (15 September 2004); doi: 10.1117/12.549112; https://doi.org/10.1117/12.549112

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