Narrow-band apodized Bragg grating filters based on SOI platform

Filters with narrow bandwidth, high sidelobe suppression ratio (SLSR), and large free spectral range (FSR) play an important role in photonic circuits. In this work, we demonstrate a narrow-band silicon photonic filter using an adiabatic directional coupler (ADC)-assisted subwavelength multimode wav...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 41; no. 24; pp. 1 - 6
Main Authors Liang, Fenglong, Zheng, Shaonan, Zhao, Xingyan, Qiu, Yang, Dong, Yuan, Zhong, Qize, Hu, Ting
Format Journal Article
LanguageEnglish
Published New York IEEE 15.12.2023
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Apodization
Bandwidth
Bandwidths
Bragg gratings
C band
Couplings
Directional couplers
Filtering
Filters
Filtration
Gratings
Misalignment
Optical filters
Optical waveguides
Photonics
Sidelobe reduction
Sidelobes
Silicon photonics
SOI
Waveguides
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Summary:Filters with narrow bandwidth, high sidelobe suppression ratio (SLSR), and large free spectral range (FSR) play an important role in photonic circuits. In this work, we demonstrate a narrow-band silicon photonic filter using an adiabatic directional coupler (ADC)-assisted subwavelength multimode waveguide Bragg grating (SMWG). The complementary lateral misalignment modulation (CLMM) is applied to realize the apodization for suppressing sidelobes in the filtering spectrum. Two subwavelength corrugations with different widths are designed to achieve a narrow-band filtering spectrum and relieve the requirement of fabrication precision. Experiment results show that a 3-dB bandwidth of 0.51 nm and a SLSR of 16.6 dB are achieved on the CLMM apodized and ADC-assisted SMWG device. An unlimited FSR in the wavelength range of C band is demonstrated as well.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2023.3300872