10 June 2004 The fabrication of pyramid-shaped fiber microlenses for coupling the high-power diode lasers into the single-mode fibers
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Abstract
We propose a new scheme of the lensed fiber employing a pyramid-shaped fiber (PSF) for coupling the high-power diode lasers into the single-mode fibers (SMFs). First, the PSF was fabricated by grinding technique and then heating in a fusing splicer to form a quasi-ellipsoidal endface which described by the symmetric radius of curvatures in two axes. For an optimum microlens with high coupling efficiency, the dominate radius of curvature is typically smaller than the fiber mode field diameter. The advantage of the PSF structure was to be able to form the microlenses with small dominate rdius of curvatures and high asymmetric ratios of radius of curvatures, and therefore, this novel PSF can form microlenses with high aspect ratios to match the far field of the 980nm high power diode lasers which were used in the application of erbium-doped fiber amplifier (EDFA). A coupling efficiency of 83% has been demonstrated. A simplified and practical model was propsed to predict the radius of curvatures in the fabrication. The calculation of divergence angles and aspect ratios of lensed fiber far-field patterns were included in this study.
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Szu-Ming Yeh, Szu-Ming Yeh, Y.K. Lu, Y.K. Lu, S.Y. Huang, S.Y. Huang, H.H. Lin, H.H. Lin, W.H. Cheng, W.H. Cheng, "The fabrication of pyramid-shaped fiber microlenses for coupling the high-power diode lasers into the single-mode fibers", Proc. SPIE 5358, Photonics Packaging and Integration IV, (10 June 2004); doi: 10.1117/12.528222; https://doi.org/10.1117/12.528222
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