High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method
A 2 × 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 × 2 3-dB couplers based on direction couplers or multimode interference couplers, adiabat...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2021-01-01
|
| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9524513/ |
| _version_ | 1811234318594342912 |
|---|---|
| author | In Ki Kim Dong Uk Kim Vinh Huu Nguyen Sangyoon Han Tae Joon Seok |
| author_facet | In Ki Kim Dong Uk Kim Vinh Huu Nguyen Sangyoon Han Tae Joon Seok |
| author_sort | In Ki Kim |
| collection | DOAJ |
| description | A 2 × 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 × 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 × 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 μm. 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. |
| first_indexed | 2024-04-12T11:34:36Z |
| format | Article |
| id | doaj.art-b11b9a92332e40a69a55f72e27ed86a7 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-04-12T11:34:36Z |
| publishDate | 2021-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-b11b9a92332e40a69a55f72e27ed86a72022-12-22T03:34:52ZengIEEEIEEE Photonics Journal1943-06552021-01-011341610.1109/JPHOT.2021.31078529524513High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer MethodIn Ki Kim0https://orcid.org/0000-0002-3563-3380Dong Uk Kim1Vinh Huu Nguyen2Sangyoon Han3Tae Joon Seok4https://orcid.org/0000-0001-5902-5446School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, Republic of KoreaDepartment of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Republic of KoreaSchool of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, Republic of KoreaDepartment of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology, Daegu, Republic of KoreaSchool of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, Republic of KoreaA 2 × 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 × 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 × 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 μm. 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.https://ieeexplore.ieee.org/document/9524513/Integrated photonics circuitsilicon photonicswaveguidesadiabatic coupler |
| spellingShingle | In Ki Kim Dong Uk Kim Vinh Huu Nguyen Sangyoon Han Tae Joon Seok High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method IEEE Photonics Journal Integrated photonics circuit silicon photonics waveguides adiabatic coupler |
| title | High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method |
| title_full | High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method |
| title_fullStr | High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method |
| title_full_unstemmed | High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method |
| title_short | High-Performance and Compact Silicon Photonic 3-dB Adiabatic Coupler Based on Shortest Mode Transformer Method |
| title_sort | high performance and compact silicon photonic 3 db adiabatic coupler based on shortest mode transformer method |
| topic | Integrated photonics circuit silicon photonics waveguides adiabatic coupler |
| url | https://ieeexplore.ieee.org/document/9524513/ |
| work_keys_str_mv | AT inkikim highperformanceandcompactsiliconphotonic3dbadiabaticcouplerbasedonshortestmodetransformermethod AT dongukkim highperformanceandcompactsiliconphotonic3dbadiabaticcouplerbasedonshortestmodetransformermethod AT vinhhuunguyen highperformanceandcompactsiliconphotonic3dbadiabaticcouplerbasedonshortestmodetransformermethod AT sangyoonhan highperformanceandcompactsiliconphotonic3dbadiabaticcouplerbasedonshortestmodetransformermethod AT taejoonseok highperformanceandcompactsiliconphotonic3dbadiabaticcouplerbasedonshortestmodetransformermethod |