Design and fabrication of monolithic optical spot size transformers (MOSTs) for highly efficient fiber-chip coupling

A novel type of monolithic optical spot size transformer realized in the InP/InGaAsP material system combines many desirable features like high fiber-chip coupling efficiency, large spot size transformation, high tolerances for fiber alignment, simple fabrication, and straightforward integrability w...

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Bibliographic Details
Published in:Journal of lightwave technology 1994-10, Vol.12 (10), p.1782-1790
Main Authors: Wenger, G., Stoll, L., Weiss, B., Schienle, M., Muller-Nawrath, R., Eichinger, S., Muller, J., Acklin, B., Muller, G.
Format: Article
Language:English
Subjects:
Indium phosphide
Monolithic integrated circuits
Optical coupling
Optical design
Optical device fabrication
Optical devices
Optical fiber devices
Optical materials
Optical waveguides
Transformers
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Summary:A novel type of monolithic optical spot size transformer realized in the InP/InGaAsP material system combines many desirable features like high fiber-chip coupling efficiency, large spot size transformation, high tolerances for fiber alignment, simple fabrication, and straightforward integrability with other devices. The spot size transformation is accomplished by two waveguide sections tapered in the vertical and lateral directions, respectively. We discuss design issues, describe the fabrication process, give experimental results, and present the monolithic integration of the spot size transformers with a current controlled directional coupler switch.< >
ISSN:0733-8724
1558-2213
DOI:10.1109/50.337491