On-chip optical narrowband reflector based on anti-symmetric Bragg grating

We propose an on-chip optical narrowband reflector (NBR) based on two cascaded Bragg gratings (BGs). A π phase shifted anti-symmetric Bragg grating (π-PS-ASBG) and a rear uniform Bragg grating (UBG), are in-line connected. The π-PS-ASBG provides a hybrid mode resonance between the even- and odd TE (...

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Bibliographic Details
Published in:Optics express 2019-12, Vol.27 (26), p.38541-38552
Main Authors: Wu, Yitao, Shi, Yuechun, Zhao, Yong, Li, Lianyan, Wu, Pinghui, Dai, Pan, Fang, Tao, Chen, Xiangfei
Format: Article
Language:English
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Summary:We propose an on-chip optical narrowband reflector (NBR) based on two cascaded Bragg gratings (BGs). A π phase shifted anti-symmetric Bragg grating (π-PS-ASBG) and a rear uniform Bragg grating (UBG), are in-line connected. The π-PS-ASBG provides a hybrid mode resonance between the even- and odd TE (TE and TE ) modes, while the UBG is used as a rear reflector to reflect the TE mode that transmitted from the π-PS-ASBG. Different from traditional UBG, the reflection bandwidth decreases when the coupling coefficient increases. The calculated 3-dB bandwidth is 0.16 nm when the whole grating length is 400 µm. The proposed NBR can be applied in the cases requiring narrow reflection such as narrow linewidth semiconductor lasers.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.27.038541