Transmission Behavior of Single-Mode Fiber Based on a Microchannel

M. Nadafana, A. Ahmadianb, S.N. Araba, J.Z. Anvaria aDepartment of Physics, Faculty of Science, Shahid Rajaee Teacher Training University, Tehran, P.O. Box 16788-15811, I.R. Iran bDepartment of Physics, Faculty of Science, Tarbiat Modares University, Tehran, P.O. Box 14115-175, I.R. Iran

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The properties of light transmission in a single-mode fiber (SMF) with a cylindrical microchannel were investigated by the FDTD method. Different microchannel diameters (2-15 μm) were addressed. The core was made of silica with a refractive index of 1.4 which was covered by a carbon nanosheet whose refractive index was 2.47. The influence of the Fabry-Perot (FP) resonance was vividly observed in transmission properties. The transmission of light at a constant wavelength varied depending on the refractive index in the microchannel. The transmitted light decreased by increasing the microchannel refractive index. The transmission significantly changed with varying the microchannel refractive index from 1.3 to 1.4 and from 1.1 to 1.2. It was found that an SMF based on the microchannel at different diameters can be used for refractive index sensing. The numerical results are in good agreement with those reported in the microhole or microchannel experiment. The comparison of the related experimental and numerical results shows that the well-controlled microchannel diameter could increase light transmission by passing through the core-microchannel. The refractive index sensitivity to microchannel diameters is a promising approach for developing applications of fiber optical devices.

DOI:10.12693/APhysPolA.139.627 topics: optical fiber, single-mode fibers, transmission, index sensing