12 May 2004 980-nm broad-area diode laser coupled to a cylindrical lensed multimode fiber
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Proceedings Volume 5280, Materials, Active Devices, and Optical Amplifiers; (2004) https://doi.org/10.1117/12.520350
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China
A theoretical model is presented to calculate the fiber coupling efficiency and alignment tolerances for the case of a 980nm 100μm broad-area diode laser directly coupled to a 100μm round-shaped cylindrical lensed multimode fiber. Both radius and wedge angle of the round-shaped cylindrical lens are optimized for maximum coupling efficiency. It is found that with proper design, a coupling efficiency of up to 98% may be obtained theoretically. The alignment tolerances for all three directions (vertical, horizontal, and axial offsets) are also calculated. It is found that the vertical offset (X-offset) tolerance is the most critical one among three, but is still acceptable (~2μm) for low-cost practical packaging. It is also found that the distance between the diode and the fiber, and the lens shape on the fiber can be further varied to improve this tolerance.
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Shizhe Shen, Shizhe Shen, Quan J. Zhang, Quan J. Zhang, Yuanxiang Wang, Yuanxiang Wang, } "980-nm broad-area diode laser coupled to a cylindrical lensed multimode fiber", Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004); doi: 10.1117/12.520350; https://doi.org/10.1117/12.520350

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