Investigation of the efficient coupling between a highly elliptical Gaussian profile output from a laser diode and a single mode fiber using a hyperbolic-shaped microlens |
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| Authors: | Huei Min Yang Chun Ting Chen Ruyen Ro Tsair Chun Liang |
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| Institution: | 1. Department of Communication Engineering, I-Shou University, Taiwan 1, Section 1, Hsueh-cheng Road, Dashu Hsiang, Kaohsiung, Taiwan 840, ROC;2. Institute of Electro-Optical Engineering, National Kaohsiung First University of Science and Technology, Kaohsiung, Taiwan 811, ROC;1. Department of Physics, Murshidabad College of Engineering & Technology, Murshidabad, 742102, West Bengal, India;2. Department of Physics, University College of Science and Technology, University of Calcutta, Kolkata, 700009, West Bengal, India;3. Dept. of Electronics, Brainware University, Barasat, Kolkata, 700124, West Bengal, India;1. Department of Medical System Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea;2. School of Information and Communications, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea;3. School of Mechatronics, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea;4. Center for Safety Measurement, Korea Research Institute of Standards and Science, 1 Doryong-dong, Yuseong-gu, Daejeon 305-340, Republic of Korea |
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| Abstract: | A tapered hyperbolic-shaped microlens has been improved for efficient the coupling of the output from a laser diode into an optical fiber. A tapered hemispherical-end fiber microlens is also evaluated for comparison purposes. The Fresnel diffraction theory is used to evaluate laser to fiber coupling using microlenses. Experimental results demonstrate that, for an elliptical Gaussian laser diode with an aspect ratio of 1:1.5, the coupling efficiencies for the hyperbolic-shaped microlenses and the hemispherical-end fiber microlenses are 87% and 62%, respectively. Simulation results show excellent agreement with the measurements. The research results illustrate that a hyperbolic-shaped microlens has a much higher coupling efficiency than a hemispherical-end microlens due to efficient mode matching and phase matching. |
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