Coupling-loss reduction of a vertically coupled microring resonator filter by spot-size-matched busline waveguides |
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Authors: | Kato Tomoyuki Suzuki Shuichi Kokubun Yasuo Chu Sai Tak |
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Affiliation: | Graduate School of Engineering, Yokohama National University, Japan. |
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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. |
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