Waveguide Grating Couplers in Overlaid Chips: Efficiency Optimization and Angular Misalignment Simulation

Wan, Congshan; Gaylord, Thomas K.; Bakir, Muhannad S.

doi:10.1364/fio.2017.jw4a.94

Cited by 1 publication

(1 citation statement)

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“…The unidirectional emission nature of the proposed grating coupler sheds light on the possibility of 3D stacked interlay of photonic chips in which each pair of grating couplers works as an optical via, allowing the mediation of light energy flow across the upper and lower chips (24)(25)(26)(27)(28). To verify this concept, we perform numerical simulation (Lumerical, FDTD) in which the waveguide mode transmits into and radiates through the unidirectional grating coupler on the lower chip.…”

Section: Sample Fabrication and Experimental Characterizationmentioning

confidence: 99%

Ultralow-loss optical interconnect enabled by topological unidirectional guided resonance

Wang,

Zuo,

Yin

et al. 2024

Sci. Adv.

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Grating couplers that interconnect photonic chips to off-chip components are crucial for various optoelectronics applications. Despite numerous efforts in past decades, the existing grating couplers are still far from optimal in energy efficiency and thus hinder photonic integration toward a larger scale. Here, we propose a strategy to achieve ultralow-loss grating couplers by using unidirectional guided resonances (UGRs), suppressing the useless downward radiation with no mirror on the bottom. By engineering the dispersion and apodizing the geometry of grating, we experimentally realize a grating coupler with a record-low loss of −0.34 dB and 1-dB bandwidth exceeding 30 nm at the telecom wavelength of 1550 nm and further demonstrate an optic via with a loss of only −0.94 dB. Given that UGRs ubiquitously exist in a variety of grating geometries, our work sheds light on a systematic method to achieve energy-efficient optical interconnect and paves the way to large-scale photonic integration.

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Section: Sample Fabrication and Experimental Characterizationmentioning

confidence: 99%

Ultralow-loss optical interconnect enabled by topological unidirectional guided resonance

Wang,

Zuo,

Yin

et al. 2024

Sci. Adv.

View full text Add to dashboard Cite

show abstract

Waveguide Grating Couplers in Overlaid Chips: Efficiency Optimization and Angular Misalignment Simulation

Abstract: Applying reflectors adds 30%~40% to the diffraction efficiencies of binary waveguide gratings. The greatest angular misalignment sensitivity occurs for rotations about the grating groove axis and rotation should be limited to ±3°.

Cited by 1 publication

References 8 publications

Ultralow-loss optical interconnect enabled by topological unidirectional guided resonance

Ultralow-loss optical interconnect enabled by topological unidirectional guided resonance

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