Compact dual-mode waveguide crossing based on adjoint shape optimization

Zhao, Caiyue; Cheng, Lirong; Chen, Houyu; Mao, Simei; Wang, Yinghui; Li, Qian; Fu, H. Y.

doi:10.1364/ol.495310

Cited by 7 publications

(1 citation statement)

References 25 publications

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“…Adjoint shape optimization is a gradient-based inverse design and is suitable for the design of an initial structure. Meanwhile, it is also easy to apply shape constraints, leading to fabrication-friendly devices such as 1 × 2 splitters [21], waveguide crossing [22], and polarization rotators [23]. However, there have been limited investigations into the utilization of adjoint shape optimization for the design of adiabatic couplers.…”

Section: Introductionmentioning

confidence: 99%

Ultra-Broadband and Compact 2 × 2 3-dB Silicon Adiabatic Coupler Based on Supermode-Injected Adjoint Shape Optimization

Chen,

Su,

et al. 2023

Photonics

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The 2 × 2 3-dB couplers are one of the most widely used and important components in silicon photonics. Here, we propose an ultra-broadband and compact 2 × 2 3-dB adiabatic coupler defined by b-splines and optimized with an efficient supermode-injected adjoint shape optimization. By employing mode adiabatic evolution and mode coupling at two different wavelength ranges, respectively, we achieve an ultra-broad bandwidth of 530 nm from 1150 nm to1680 nm with a power imbalance below ±0.76 dB in a compact coupling length of 30 µm according to our simulation results. The supermode-injected adjoint shape optimization can also be applied to the design of other photonic devices based on supermode manipulation.

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Section: Introductionmentioning

confidence: 99%

Ultra-Broadband and Compact 2 × 2 3-dB Silicon Adiabatic Coupler Based on Supermode-Injected Adjoint Shape Optimization

Chen,

Su,

et al. 2023

Photonics

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Ultra-Compact On-Chip Silicon Photonic Polarization- and Wavelength-Selective Switch

Liu,

Huo,

Cheng

et al. 2024

J. Lightwave Technol.

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Compact and low-crosstalk multimode waveguide crossing utilizing subwavelength holey metamaterial waveguides

Ni,

Luo,

et al. 2024

Opt. Express

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To further increase the transmission capacity of on-chip optical communication systems, hybrid division multiplexing technology has emerged as a crucial alternative solution, in which multimode waveguide crossings are highly desired. In this paper, we propose and experimentally demonstrate a compact multimode (i.e., three different modes) waveguide crossing that employs subwavelength holey metamaterial waveguides (SHMWs). The used SHMW, formed by inserting subwavelength periodic holes into a multimode interference (MMI) coupler, deservedly exhibits synergetic advantages of the two kinds of structures, enabling an attractive three-mode (e.g., TE0, TM0, and TM1) waveguide crossing with flexible design, small size, and good performance. Simulation results show that the realized device has a low insertion loss (< 0.74 dB), low reflection loss (<−13.1 dB), and low crosstalk (<−31.6 dB) at a central wavelength of 1550 nm for all the modes with a compact footprint of 27.4 µm × 27.4 µm. The experimental results prove that insertion losses are as low as 0.72 dB, 0.27 dB, and 0.90 dB for TE0, TM0, and TM1 mode, respectively, with the corresponding crosstalk below −38 dB at 1550 nm. The proposed device can be widely applied in photonic integrated circuits to construct photonic systems with the abilities of mode control and multiplexing.

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Compact dual-mode waveguide crossing based on adjoint shape optimization

Cited by 7 publications

References 25 publications

Ultra-Broadband and Compact 2 × 2 3-dB Silicon Adiabatic Coupler Based on Supermode-Injected Adjoint Shape Optimization

Ultra-Broadband and Compact 2 × 2 3-dB Silicon Adiabatic Coupler Based on Supermode-Injected Adjoint Shape Optimization

Ultra-Compact On-Chip Silicon Photonic Polarization- and Wavelength-Selective Switch

Compact and low-crosstalk multimode waveguide crossing utilizing subwavelength holey metamaterial waveguides

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