Inverse design of multi-band and wideband waveguide crossings

Dan, Yi; Zhou, Wen; Zhang, Yaojing; Tsang, Hon Ki

doi:10.1364/ol.416781

Cited by 19 publications

(5 citation statements)

References 23 publications

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“…A waveguide crossing − is an essential component for signal routing in large-scale and high-density photonic integrated circuits. Traditional waveguide crossing designs typically rely on heuristic-shaped taper or multimode interferometer (MMI) structures combined with exhaustive parameter sweeps. , Here we design a compact waveguide crossing using our inverse-design algorithm without the need for an initial guess.…”

Section: Resultsmentioning

confidence: 99%

Inverse-Designed Lithium Niobate Nanophotonics

et al. 2023

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Lithium niobate-on-insulator (LNOI) is an emerging photonic platform that exhibits favorable material properties (such as low optical loss, strong nonlinearities, and stability) and enables large-scale integration with stronger optical confinement, showing promise for future optical networks, quantum processors, and nonlinear optical systems. However, while photonics engineering has entered the era of automated “inverse design” via optimization in recent years, the design of LNOI integrated photonic devices still mostly relies on intuitive models and inefficient parameter sweeps, limiting the accessible parameter space, performance, and functionality. Here, we implement a 3D gradient-based inverse-design model tailored for topology optimization based on the LNOI platform, which not only could efficiently search a large parameter space, but also takes into account practical fabrication constraints, including minimum feature sizes and etched sidewall angles. We experimentally demonstrate a spatial-mode multiplexer, a waveguide crossing, and a compact waveguide bend, all with low insertion losses, tiny footprints, and excellent agreement between simulation and experimental results. The devices, together with the design methodology, represent a crucial step toward the variety of advanced device functionalities needed in future LNOI photonics and could provide compact and cost-effective solutions for future optical links, quantum technologies, and nonlinear optics.

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Section: Resultsmentioning

confidence: 99%

Inverse-Designed Lithium Niobate Nanophotonics

et al. 2023

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“…2 for In each switching subnetwork the MZI design can be tuned to provide the maximum transmission, while reducing the distortion and filtering penalties. The following interconnect crossing network has been modelled considering each waveguide crossing as a lossy element, introducing 0.06 dB of loss in the considered spectrum, which is comparable state of the art crossing technologies 8,9 . Furthermore the waveguide combiner used in the interconnect stage have been modeled under a similar assumption, considering the insertion losses reported in the literature for optimized integrated wavelength combiners.…”

Section: Components Design and Simulationmentioning

confidence: 99%

Photonic-integrated wavelength selective switch for S+C+L applications

Tunesi¹,

Khan²,

Masood³

et al. 2023

Optical Components and Materials XX

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We propose a novel modular photonic integrated Wavelength Selective Switch (WSS) based on a reconfigurable optical multiplexer architecture, capable to operate over the S+C+L bands and scalable. The densely integrated solution takes advantage of an input stage with grating assisted contra-directional couplers to separate channels in the three considered communication bands, followed by a cascade of two-stage ladder ring resonators, to separating each transmitted channel. A final switching stage routes the signal to the desired output fiber, with a cascade of thermally controlled Mach-Zehnder interferometers. The transmission penalty of the proposed solution has been evaluated in a coherent transmission scenario.

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“…[35] Unfortunately, these complex structures are time-consuming to optimize and might contain many fine features beyond the fabrication capabilities. [36][37][38][39][40][41][42] As far as it can be seen, the quest for broadband, compact, and multimode waveguide crossings remains elusive.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Broadband Multimode Waveguide Crossing via Subwavelength Transmitarray with Bound State

Guo

Wang

Zhang

et al. 2023

Laser & Photonics Reviews

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As a fundamental building block for photonic integrated circuits, waveguide crossing is playing an essential role for routing the increasingly complex network on chip. Driven by the demands for carrying a large capacity of data per waveguide, wavelengths and guiding modes are emerging as important degrees of freedom for optical multiplexing to embrace the advantages of signal parallelism. Although various waveguide crossing structures are proposed to either support broad spectra of wavelengths or a large number of modes, none of these are simultaneously achieved. Here, an ultra-broadband multimode waveguide crossing based on subwavelength transmitarray (SWTA) is proposed. The SWTA is well designed for high transmittance in the propagation direction and excellent confinement in its orthogonal direction by creation of a bound state. A three-mode crossing is designed and fabricated on silicon on insulator with a compact footprint of only 5.05 µm × 5.05 µm. The crossing is able to operate over a large bandwidth from 1.4 to 2.1 µm with an excess loss of less than 0.77 dB. For a proof-of-concept demonstration of the structure scalability, the crossing is predicted to support up to ten modes. The ultra-broadbandwidth and compactness of this multimode crossing make it possible to densely cross connect the waveguides with large data capacity via wavelength and mode division multiplexing.

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Inverse design of multi-band and wideband waveguide crossings

Cited by 19 publications

References 23 publications

Inverse-Designed Lithium Niobate Nanophotonics

Inverse-Designed Lithium Niobate Nanophotonics

Photonic-integrated wavelength selective switch for S+C+L applications

Ultra‐Broadband Multimode Waveguide Crossing via Subwavelength Transmitarray with Bound State

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