Analysis of higher-order mode suppressed transmission in low-loss silicon multimode waveguides on silicon-on-insulator substrates

Higher-order mode coupling at bending waveguides between Si multimode waveguides and 500-nm-wide wire waveguides was evaluated for low-loss Si multimode waveguide circuits. By narrowing the multimode waveguides to the wire waveguides at the bending section, the TE fundamental mode propagation was st...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2014-07, Vol.53 (7), p.78002-1-078002-3
Main Authors: Atsumi, Yuki, Kang, JoonHyun, Hayashi, Yusuke, Suzuki, Junichi, Nishiyama, Nobuhiko, Arai, Shigehisa
Format: Article
Language:English
Subjects:
Circuits
Fluctuation
Noise levels
Silicon
Silicon substrates
Spectra
Wave propagation
Waveguides
Wire
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Summary:Higher-order mode coupling at bending waveguides between Si multimode waveguides and 500-nm-wide wire waveguides was evaluated for low-loss Si multimode waveguide circuits. By narrowing the multimode waveguides to the wire waveguides at the bending section, the TE fundamental mode propagation was strongly maintained in the entire circuit, and the spectral fluctuation was improved from 10 dB to less than 1 dB for a 4-µm-wide waveguide. Furthermore, propagation losses were reduced to less than 1 dB/cm with waveguide widths greater than 1 µm.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.53.078002