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11 March 2003 Simple-to-fabricate and highly efficient spot-size converters using antiresonant reflecting optical waveguides
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We report on a new concept for InGaAsP-InP 1.55 μm lasers with integrated spot-size converters based on antiresonant reflecting optical waveguides (ARROW). The mode expanders consist of a laterally tapered active region on top of a fiber-matched passive slab waveguide. The large slab mode is laterally confined by an antiresonant configuration of a couple of lateral waveguides defined in the same fabrication process as the active ridge. This feature makes the presented spot-size transformer as simple to fabricate as a standard waveguide, only requiring a planar growth step and a single conventional etch process. The fabricated tapers exhibit a low transformation loss and reduce the coupling loss to standard single-mode fibers from 8 to 4 dB. We also analyze by simulation two variants of the concept proposed in this work, including a taper structure for a buried waveguide, which are expected to show better performance. Simulation results show fiber-coupling efficiencies as low as 2.4 and 1.1 dB for both variants.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Marko Galarza, Kurt De Mesel, Steven Verstuyft, Candido Aramburu, Ingrid Moerman, Peter Van Daele, Roel G. Baets, and Manuel Lopez-Amo "Simple-to-fabricate and highly efficient spot-size converters using antiresonant reflecting optical waveguides", Proc. SPIE 4947, Laser Diodes, Optoelectronic Devices, and Heterogenous Integration, (11 March 2003);

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