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Proceedings Paper

Simple-to-fabricate and highly efficient spot-size converters using antiresonant reflecting optical waveguides
Author(s): Marko Galarza; Kurt De Mesel; Steven Verstuyft; Candido Aramburu; Ingrid Moerman; Peter Van Daele; Roel G. Baets; Manuel Lopez-Amo
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Paper 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.

Paper Details

Date Published: 11 March 2003
PDF: 9 pages
Proc. SPIE 4947, Laser Diodes, Optoelectronic Devices, and Heterogenous Integration, (11 March 2003); doi: 10.1117/12.470176
Show Author Affiliations
Marko Galarza, Univ. Ghent-IMEC (Belgium)
Kurt De Mesel, Univ. Gent-IMEC (Belgium)
Steven Verstuyft, Univ. Gent-IMEC (Belgium)
Candido Aramburu, Univ. Publica de Navarra (Spain)
Ingrid Moerman, Univ. Gent-IMEC (Belgium)
Peter Van Daele, Univ. Gent-IMEC (Belgium)
Roel G. Baets, Univ. Gent-IMEC (Belgium)
Manuel Lopez-Amo, Univ. Publica de Navarra (Spain)

Published in SPIE Proceedings Vol. 4947:
Laser Diodes, Optoelectronic Devices, and Heterogenous Integration
John Gerard McInerney; Alfred Driessen; Roel G. Baets; Ephraim Suhir, Editor(s)

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