CMOS-compatible ultra-compact silicon multimode waveguide bend based on inverse design method

Yang, Shanglin; Jia, Hao; Niu, Jiaqi; Fu, Xin; Yang, Lin

doi:10.1016/j.optcom.2022.128733

Cited by 8 publications

(2 citation statements)

References 38 publications

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“…Direct binary search algorithm 23 , direct range search algorithm 24 , objective first algorithm 25 , and topology optimization 26 are used to make efficient bends with reduced footprint. By exploring the studies on waveguide bends we found that much of the existing literature appears to focus on multi-mode waveguides and the objective was mostly to reduce the insertion loss and intermodal coupling 24 – 29 . While the majority of research has contributed to multi-mode waveguide bending, the advancement of bend designs for single-mode propagation using inverse design methods remains relatively under-explored.…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact and efficient photonic waveguide bends with different configurations designed by topology optimization

Irfan,

Kim,

Kurt

2024

Sci Rep

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Transporting light signals over the corners and sharp bends imposes high optical loss and distortion on the mode profiles. Usually, bends with larger radii are used in circuits to minimize the loss over transmission, resulting in a severe limitation in integration density. In this paper, we propose novel topology-optimized optimized L-bend and U-bend structures designed for a 220 nm silicon-on-insulator (SOI) platform. Optimized L-bends with footprints of 2.5 µm × 2.5 µm, 1.5 µm × 1.5 µm, and 1 µm × 1 µm show maximum insertion losses of only 0.07 dB, 0.26 dB, and 0.78 dB, respectively. For optimized U-bends with footprints of 3 µm × 3.6 µm, 2.5 µm × 2.5 µm, and 1.5 µm × 1.5 µm, the maximum insertion losses are 0.07 dB, 0.21 dB, and 3.16 dB. These optimized bends reduce the maximum insertion loss by over 50% compared to un-optimized arc-type bends across a broad wavelength range of 1450–1650 nm. Experimental verification of a meander line with 16 optimized U-bends (3 µm × 3.6 µm) demonstrates an averaged insertion loss of 1.23 dB in the wavelength range of 1520–1580 nm, agreeing with simulated results and indicating a high potential of loss reduction with optimized bends.

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Section: Introductionmentioning

confidence: 99%

Ultra-compact and efficient photonic waveguide bends with different configurations designed by topology optimization

Irfan,

Kim,

Kurt

2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Direct binary search algorithm 23 , direct range search algorithm 24 , objective first algorithm 25, and topology optimization 26 are used to make efficient bends with reduced footprint. By exploring the studies on waveguide bends we found that much of the existing literature appears to focus on multi-mode waveguides and the objective was mostly to reduce the insertion loss and intermodal coupling 24,25,26,27,28,29 . While the majority of research has contributed to multi-mode waveguide bending, the advancement of bend designs for single-mode propagation using inverse design methods remains relatively under-explored.…”

Section: Introductionmentioning

confidence: 99%

Ultra-compact and efficient photonic waveguide bends with different configurations designed by topology optimization

Irfan,

Kim,

Kurt

2023

Preprint

View full text Add to dashboard Cite

Transporting light signals over the corners and sharp bends imposes high optical loss and distortion on the mode profiles. Usually, bends with larger radii are used in circuits to minimize the loss over transmission, resulting in a severe limitation in integration density. In this paper, we propose novel topology-optimized L-bend and U-bend structures designed for a 220 nm silicon-on-insulator (SOI) platform. Optimized L-bends with footprints of 2.5 µm×2.5 µm, 1.5 µm×1.5 µm, and 1 µm×1 µm show maximum insertion losses of only 0.07 dB, 0.26 dB, and 0.78 dB, respectively. For optimized U-bends with footprints of 3 µm×3.6 µm, 2.5 µm×2.5 µm, and 1.5 µm×1.5 µm, the maximum insertion losses are 0.07 dB, 0.21 dB, and 3.16 dB. These optimized bends reduce the maximum insertion loss by over 50% compared to un-optimized arc-type bends across a broad wavelength range of 1450–1650 nm. Experimental verification of a meander line with 16 optimized U-bends (3 µm×3.6 µm) demonstrates a 1.46 dB transmission at 1550 nm, agreeing with simulated results and indicating a high potential of loss reduction with optimized bends.

show abstract

CMOS-compatible ultra-compact silicon multimode waveguide bend based on inverse design method

Cited by 8 publications

References 38 publications

Ultra-compact and efficient photonic waveguide bends with different configurations designed by topology optimization

Ultra-compact and efficient photonic waveguide bends with different configurations designed by topology optimization

Ultra-compact and efficient photonic waveguide bends with different configurations designed by topology optimization

Perturbative light–matter interactions; from first principles to inverse design

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