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Anti-reflection grating-assisted contra-directional coupler with large corrugation width.
- Source :
-
Optics Communications . Jan2024, Vol. 550, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- The grating-assisted contra-directional coupler (contra-DC) is one of the commonly used add-drop filters serving for coarse wavelength-division-multiplexing (CWDM) systems due to its flat-top and wide-band response. However, the free-spectral-range (FSR) of contra-DC is limited by the back reflection to the input port caused by the intra-waveguide coupling. In this paper we propose an anti-reflection grating-assisted contra-DC by simply increasing the sidewall corrugation width. The intra-waveguide coupling coefficient can be decreased to 0 when the corrugation width is increased to a certain value. The simulation result shows that the transmission at drop port is −0.42 dB, while the back reflection to the input port is only −22.0 dB. The 4-channel cascaded contra-DCs with wavelength range of ∼60 nm are also simulated, all the channels are not affected by the intra-waveguide coupling. We believe the proposed contra-DC with large corrugation width can be applied to the CWDM system requiring a broad spectrum range. • Explanation of the vanish of stopband when the corrugation width of waveguide Bragg grating is large. • Proposing an anti-reflection grating-assisted contra-directional coupler by simply increasing the corrugation width. • High suppression of intra-waveguide reflection in the grating-assisted contra-directional coupler of 22.0 dB. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BRAGG gratings
*INTEGRATED optics
*LIGHT filters
Subjects
Details
- Language :
- English
- ISSN :
- 00304018
- Volume :
- 550
- Database :
- Academic Search Index
- Journal :
- Optics Communications
- Publication Type :
- Academic Journal
- Accession number :
- 173174274
- Full Text :
- https://doi.org/10.1016/j.optcom.2023.130007