Coupling-loss reduction of a vertically coupled microring resonator filter by spot-size-matched busline waveguides
Open Access
- 20 July 2002
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 41 (21) , 4394-4399
- https://doi.org/10.1364/ao.41.004394
Abstract
To improve the input-output coupling loss of a vertically coupled microring resonator filter, we fabricated microring resonators on an antiresonant reflecting optical waveguide (ARROW) with a large spot size and on the rectangular busline waveguide with a spot-size transformer. The spot size and the tapered structure were optimally designed from the viewpoint of spot-size matching to single-mode fibers and the reduction of radiation loss. Clear dropping responses were demonstrated for the ARROW-based microring resonator filters, and the coupling loss was successfully reduced by 22 dB.Keywords
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