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Korean Journal of Metals and Materials > Volume 55(4); 2017 > Article
Korean Journal of Metals and Materials 2017;55(4): 274-283. doi: https://doi.org/10.3365/KJMM.2017.55.4.274
레이저 다이오드와 단일 모드 광섬유 간의 광 결합 최적화를 위한 실리콘 플라노 컨벡스 렌즈 설계
황인엽1, 박종오1, 하준석2, 류상완1,2
1전남대학교 물리학과
2전남대학교 광전자융합기술연구소
Design of Silicon Plano Convex Lens for Optimized Light Coupling Between Laser Diodes and Single Mode Optical Fiber
In Yup Hwang1, Jongoh Park1, Jun-Seok Ha2, Sang-Wan Ryu1,2
1Department of Physics, Chonnam National University, Gwangju 61186, Republic of Korea
2Optoelectronics Convergence Research Center, Chonnam National University, Gwangju 61186, Republic of Korea
Correspondence  Sang-Wan Ryu ,Tel: +82-62-530-3476, Email: sangwan@chonnam.ac.kr
Received: 18 May 2016;  Accepted: 5 August 2016.  Published online: 6 April 2017.
High speed and large capacity optical communication networks are needed to meet the demands of increased traffic being created by mobile services. Advanced optical communication systems are based on high performance optical device modules that have small footprints and low power consumption. A microlens with a short coupling length and high coupling efficiency is an essential component of these compact optical modules, and silicon is the most widely studied material for this purpose because of its large refractive index at optical communication wavelengths. We used CODE V to simulate the coupling efficiency and the coupling tolerance of an optical system composed of a laser diode and an optical fiber coupled through a silicon lens. The maximum coupling efficiency for spherical lenses varied from -0.4 to -0.8 dB depending on the radius of curvature while -0.2 dB coupling loss was obtained with an optimized aspherical lens. Aspherical lenses exhibited larger coupling efficiencies while their coupling tolerance was slightly degraded.
Keywords: silicon lens, plano convex lens, optical coupling system, coupling efficiency, align tolerance
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