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Low-divergence laser structures for cost-effective fiber coupling applications

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4 Author(s)
Gough, O.P. ; Dept. of Electr. & Electron. Eng, Cork Inst. of Technol., Ireland ; Buckley, U. ; Corbett, B. ; Lambkin, J.D.

We report on the design of lasers using waveguide engineering to achieve low divergence emission with high butt-coupling efficiency to single-mode (SMF) and multimode fiber (MMF). A tolerant design principle is introduced for achieving low-divergence normal to the junction using a single epitaxial growth step. The design method is compatible with a wide range of material systems and is demonstrated using a 980-nm laser structure. The full-width half-maximum of the beam is reduced from more than 32/spl deg/ to 21/spl deg/. Direct butt-coupling losses are improved from -10 dB to near -3 dB for ridge waveguide to SMF coupling, while broad area devices coupled to MMF showed coupling efficiencies of >75%.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:6 ,  Issue: 4 )