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High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method

Title
High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method
Authors
Kim, In KiKim, Dong UkVinh Huu NguyenHan, SangyoonSeok, Tae Joon
DGIST Authors
Kim, In Ki; Kim, Dong Uk; Vinh Huu Nguyen; Han, Sangyoon; Seok, Tae Joon
Issue Date
2021-08
Citation
IEEE Photonics Journal, 13(4)
Type
Article
Author Keywords
Integrated photonics circuitsilicon photonicswaveguidesadiabatic coupler
Keywords
SWITCH
ISSN
1943-0655
Abstract
A 2 x 2 3-dB coupler is one of the essential photonic components, as a building block of Mach-Zehnder interferometers, to realize large-scale photonic integrated circuits. Unlike typical 2 x 2 3-dB couplers based on direction couplers or multimode interference couplers, adiabatic couplers offer various advantages such as broadband operation and superior fabrication tolerance thanks to their unique operating mechanism of adiabatic mode evolution. However, an adiabatic coupler typically requires a long device length for ideal adiabatic operation without the excitations of unwanted modes. Here, we report on a compact 2 x 2 3-dB adiabatic coupler designed using the shortest mode transformer method. By optimizing the profile of the waveguide widths and the gap spacing, the compact 3-dB coupler was designed with a short coupling length of 23.2 mu m. The fabricated device exhibits a 3-dB splitting ratio with less than +/- 0.3 dB power oscillation and a low excess loss of 0.23 dB over a broad wavelength range of 1485-1620 nm. To the best of our knowledge, our coupler has the shortest length among the adiabatic couplers with a minimum feature size of 200 nm, reported to date.
URI
http://hdl.handle.net/20.500.11750/15376
DOI
10.1109/JPHOT.2021.3107852
Publisher
Institute of Electrical and Electronics Engineers
Related Researcher
  • Author Han, Sangyoon Intelligent Nanophotonics Lab
  • Research Interests Nanophotonic devices; photonic integrated circuits; optical neural networks; optical MEMS
Files:
There are no files associated with this item.
Collection:
Department of Robotics and Mechatronics EngineeringIntelligent Nanophotonics Lab1. Journal Articles


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