Simple-to-fabricate and highly efficient spot-size converters using antiresonant reflecting optical waveguides

Marko Galarza; Kurt De Mesel; Steven Verstuyft; Candido Aramburu; Ingrid Moerman; Peter Van Daele; Roel G. Baets; Manuel Lopez-Amo

doi:10.1117/12.470176

11 March 2003 Simple-to-fabricate and highly efficient spot-size converters using antiresonant reflecting optical waveguides

Marko Galarza, Kurt De Mesel, Steven Verstuyft, Candido Aramburu, Ingrid Moerman, Peter Van Daele, Roel G. Baets, Manuel Lopez-Amo

Author Affiliations +

Proceedings Volume 4947, Laser Diodes, Optoelectronic Devices, and Heterogenous Integration; (2003) https://doi.org/10.1117/12.470176
Event: Photonics Fabrication Europe, 2002, Bruges, Belgium

Abstract

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.

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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); https://doi.org/10.1117/12.470176

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KEYWORDS

Waveguides

Etching

Tolerancing

Fiber lasers

Optical simulations

Single mode fibers

Fiber couplers

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