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Compact mode expanded lasers using resonant coupling between a 1.55-μm InGaAsP tapered active region and an underlying coupling waveguide

We demonstrate a novel expanded mode laser for enhanced laser-fiber coupling based on resonant coupling between a tapered active waveguide and an underlying coupling waveguide. This device was grown in a single standard epitaxial growth and was processed using conventional fabrication techniques, thus making it attractive for low-cost manufacturing. The total taper length required for mode transformation was 200 /spl mu/m and the excess transformation loss was 0.6 dB indicating the compact, low-loss mode transformation. Far-field divergence angles (13/spl deg//spl times/24/spl deg/) and improved coupling to cleaved single-mode fibers (3.8-dB coupling loss), were achieved.