Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 18, Pages 5896-5901Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3092045
Keywords
Optical waveguides; Couplings; Gratings; Bragg gratings; Delays; Optical filters; Couplers; Bragg reflectors; couplers; integrated optics device; waveguides; wavelength filtering devices
Funding
- Natural Science Foundation of Fujian [2019J01796]
- Natural Science Foundation of China [62005242]
- Natural Science Foundation of Zhejiang [LY21F040004]
- Natural Science Foundation of Ningbo [2019A610074, 2017A610128]
- National Training Program of Innovation and Entrepreneurship [202011312016]
- Ningbo 2025 Major Project of Science and Technology Innovation [2020Z021]
- Fujian Provincial Key Laboratory for Advanced Micro-nano Photonics Technology
- Devices foundation
- Zhangping Qimai Foundation
- Fujian University Project of Industry-Education-Research Cooperation [2021H6013]
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In this study, we demonstrate flat-top, sharp-edge, silicon add-drop filters using apodized grating-assisted contradirectional couplers (contra-DCs). By applying Gaussian apodization and complementary lateral-misalignment modulation, our devices achieve improved spectral responses with high sidelobe suppression ratios. The series-cascaded devices show even higher SLSRs and sharper filtering edges.
We demonstrate flat-top, sharp-edge, silicon add-drop filters using apodized grating-assisted contradirectional couplers (contra-DCs). Periodic sidewall corrugations are imposed on both sides of two asymmetric strip waveguides for contradirectional coupling between the first two TE supermodes of a two-waveguide system. Gaussian apodization is applied to suppress the sidelobes. By laterally shifting the positions of both waveguide Bragg gratings in a complementary manner, which is called complementary lateral-misalignment modulation, our devices avoid phase errors which impair the spectral responses for conventional lateral-misalignment modulated contra-DCs. We demonstrate a complementary lateral-misalignment modulated (CLMM) contra-DC that has a flat-top, rapid roll-off, drop-port spectral response with a sidelobe suppression ratio (SLSR) of 20 dB. We also demonstrate a series-cascaded CLMM contra-DCs that has a higher SLSR of 39 dB and a sharper filtering edge. (c)
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