Journal
IEEE PHOTONICS JOURNAL
Volume 14, Issue 2, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3160180
Keywords
Silicon; Electromagnetic waveguides; Couplings; Strips; Bandwidth; Gratings; Optical waveguides; Directional coupler (DC); subwavelength grating (SWG); wavelength demultiplexer
Funding
- National Natural Science Foundation of China [62105183]
- Shandong Provincial Natural Science Foundation [ZR2021QF052]
- National Key Research and Development Program of China [2018YFA0209000, 2018YFB2200700]
- Fundamental Research Funds of Shandong University
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An ultracompact and broadband silicon wavelength demultiplexer based on SWG-assisted directional coupler is designed and demonstrated. It achieves wavelength splitting of 1310 and 1550 nm with a small footprint, high extinction ratios, and wide bandwidths for O-band and C-band.
An ultracompact and broadband silicon wavelength demultiplexer based on SWG-assisted directional coupler is designed and experimentally demonstrated for wavelength splitting of 1310 and 1550 nm. The embedded SWG enables significantly reduced footprint, due to the precise phase matching at 1550 nm and large phase mismatch at 1310 nm. As a result, the fabricated device has a length of only 9 mu m, and provides high extinction ratios (ERs) of 23 dB and 19 dB at 1310 and 1550 nm, respectively. Its 3-dB bandwidths are 85 nm for O-band (ER > 15 dB) and 140 nm for C-band (ER > 10 dB).
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