Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape Optimization
In this study, we designed and experimentally demonstrated a compact polarization-insensitive 2 × 2 3 dB quasi-adiabatic coupler based on B-spline curves and shape optimization. By using the supermode to enable the segmented shape optimization of the coupler, we significantly reduced the computation...
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MDPI AG
2025-02-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/12/3/208 |
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| author | Guangchen Su Hongliang Chen Xin Fu Lin Yang |
| author_facet | Guangchen Su Hongliang Chen Xin Fu Lin Yang |
| author_sort | Guangchen Su |
| collection | DOAJ |
| description | In this study, we designed and experimentally demonstrated a compact polarization-insensitive 2 × 2 3 dB quasi-adiabatic coupler based on B-spline curves and shape optimization. By using the supermode to enable the segmented shape optimization of the coupler, we significantly reduced the computational cost of the optimization process. The numerical simulation results exhibited a power imbalance below ±0.46 dB and an insert loss (IL) of less than 0.09 dB over a broad bandwidth of 140 nm, ranging from 1490 nm to 1630 nm for both the TE and TM polarizations, with a compact coupling length of 12 µm. The experimental results showed a power splitting ratio within 3 ± 0.46 dB over the range of 1525 nm–1600 nm for the TM mode and 1576 nm–1610 nm for the TE mode. This broadband and low-loss 3 dB coupler is suitable for microwave photonic (MPW) applications, enabling efficient polarization-independent signal processing in integrated photonic systems. |
| format | Article |
| id | doaj-art-2f8774d2a5e249b1bf669ef6fd6d5d93 |
| institution | OA Journals |
| issn | 2304-6732 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Photonics |
| spelling | doaj-art-2f8774d2a5e249b1bf669ef6fd6d5d932025-08-20T01:49:05ZengMDPI AGPhotonics2304-67322025-02-0112320810.3390/photonics12030208Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape OptimizationGuangchen Su0Hongliang Chen1Xin Fu2Lin Yang3Key Laboratory of Optoelectronic Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaKey Laboratory of Optoelectronic Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaKey Laboratory of Optoelectronic Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaKey Laboratory of Optoelectronic Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, ChinaIn this study, we designed and experimentally demonstrated a compact polarization-insensitive 2 × 2 3 dB quasi-adiabatic coupler based on B-spline curves and shape optimization. By using the supermode to enable the segmented shape optimization of the coupler, we significantly reduced the computational cost of the optimization process. The numerical simulation results exhibited a power imbalance below ±0.46 dB and an insert loss (IL) of less than 0.09 dB over a broad bandwidth of 140 nm, ranging from 1490 nm to 1630 nm for both the TE and TM polarizations, with a compact coupling length of 12 µm. The experimental results showed a power splitting ratio within 3 ± 0.46 dB over the range of 1525 nm–1600 nm for the TM mode and 1576 nm–1610 nm for the TE mode. This broadband and low-loss 3 dB coupler is suitable for microwave photonic (MPW) applications, enabling efficient polarization-independent signal processing in integrated photonic systems.https://www.mdpi.com/2304-6732/12/3/208quasi-adiabatic couplerinverse designshape optimizationsilicon photonicswaveguide devices |
| spellingShingle | Guangchen Su Hongliang Chen Xin Fu Lin Yang Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape Optimization Photonics quasi-adiabatic coupler inverse design shape optimization silicon photonics waveguide devices |
| title | Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape Optimization |
| title_full | Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape Optimization |
| title_fullStr | Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape Optimization |
| title_full_unstemmed | Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape Optimization |
| title_short | Compact Polarization-Insensitive 2 × 2 3 dB Quasi-Adiabatic Coupler Based on Shape Optimization |
| title_sort | compact polarization insensitive 2 2 3 db quasi adiabatic coupler based on shape optimization |
| topic | quasi-adiabatic coupler inverse design shape optimization silicon photonics waveguide devices |
| url | https://www.mdpi.com/2304-6732/12/3/208 |
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