An optimum approach for fabrication of tapered hemispherical-end fiber for laser module packaging |
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Authors: | H. M. Yang D. C. Jou M. H. Chen S. H. Wu W. H. Cheng |
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Affiliation: | (1) Institute of Electro-Optical Engineering, National Sun Yat-sen University, 80424 Kaoshiung, Taiwan |
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Abstract: | Comprehensive measurements of the dependence of coupling efficiency and radius of curvature on taper angle in a tapered hemispherical-end fiber (THEF) for coupling between laser diodes and single-mode fibers are presented. The THEF was fabricated by etching the fiber end in a hydrofloride (HF) solution with a thin layer of oil floating on top of the HF, and then heating in a fusion splicer to form a hemispherical end. The results show that THEFs with larger taper angles fabricated by greater oil density exhibit a smaller radius of curvature, and hence a better coupling efficiency. The results of this investigation have led to an optimum approach for high-yield and high-volume fabrication of THEFs that is suitable for use in commercial laser diode modules for efficient coupling between laser diodes and single-mode fibers. The calculation of the effect of oil density in HF etching solution on taper angle based on a semiempirical model is in good agreement with the measured results. |
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Keywords: | Laser module packaging tapered hemispherical-end fiber coupling efficiency semiempirical model |
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