Silicon subwavelength modal Bragg grating filters with narrow bandwidth and high optical rejection.
Opt Lett
; 45(20): 5784-5787, 2020 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-33057284
ABSTRACT
Waveguide Bragg grating filters with narrow bandwidths and high optical rejections are key functions for several advanced silicon photonics circuits. Here, we propose and demonstrate a new, to the best of our knowledge, Bragg grating geometry that provides a narrowband and high rejection response. It combines the advantages of subwavelength and modal engineering. As a proof-of-concept demonstration, we implement the proposed Bragg filters in 220-nm-thick Si technology with a single etch step. We experimentally show flexible control of the filter selectivity, with measured null-to-null bandwidths below 2 nm, and strength of 60 dB rejection with a null-to-null bandwidth of 1.8 nm.
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MEDLINE
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En
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Opt Lett
Ano de publicação:
2020
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Article