Experimental demonstration of a broadband mode converter and multiplexer based on subwavelength grating waveguides

González-Andrade, David; Dias, António; Wangüemert‐Pérez, J. Gonzalo; Ortega‐Moñux, Alejandro; Molina-Fernández, Í.; Halir, Robert; Cheben, Pavel; Velasco, Aitor V.

doi:10.1016/j.optlastec.2020.106297

Cited by 33 publications

(21 citation statements)

References 42 publications

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“…Conversely, the strong modal confinement results in SOI devices with high sensitivity to geometrical deviations from nominal design. This constraint is also present in power splitting components, a fundamental functionality in most silicon photonic integrated circuits [ 11 ] and, specifically, in an extensive range of applications including wavelength- and mode-division multiplexing [ 12 ], optical phased arrays [ 13 ] and on-chip spectrometers [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the simplicity of its design and operation principle [ 28 , 29 ], we consider these devices to be of special interest for SOI platforms, particularly for applications involving cascaded power splitting (e.g., integrated microspectrometers [ 30 ]. Moreover, Y-junctions with a bimodal stem waveguide offer a strong potential in datacom applications of growing interest, such as mode division multiplexing [ 12 , 31 , 32 ]. The transition between the stem and arms is nearly lossless and wavelength independent for small enough branching angles and a perfectly sharp junction tip between said branches [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…Under this condition, the medium acts on a macroscopic level as a homogeneous metamaterial which combines the optical properties of its dielectric constituents (e.g., effective index, dispersion, anisotropy), hence enabling the customization of the medium optical response through geometrical design. This innovative solution has been successfully applied to fiber-chip couplers, on-chip polarization management, mode-division multiplexing and integrated interferometer arrays, to name a few examples [ 6 , 12 , 44 ]. Specifically, subwavelength metamaterials have been applied to different power splitting architectures such as directional couplers [ 45 , 46 , 47 ] or MMIs [ 48 , 49 ], providing compact devices with enhanced performance over a broad bandwidth [ 50 ].…”

Section: Introductionmentioning

confidence: 99%

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High-Performance On-Chip Silicon Beamsplitter Based on Subwavelength Metamaterials for Enhanced Fabrication Tolerance

et al. 2021

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Efficient power splitting is a fundamental functionality in silicon photonic integrated circuits, but state-of-the-art power-division architectures are hampered by limited operational bandwidth, high sensitivity to fabrication errors or large footprints. In particular, traditional Y-junction power splitters suffer from fundamental mode losses due to limited fabrication resolution near the junction tip. In order to circumvent this limitation, we propose a new type of high-performance Y-junction power splitter that incorporates subwavelength metamaterials. Full three-dimensional simulations show a fundamental mode excess loss below 0.1 dB in an ultra-broad bandwidth of 300 nm (1400–1700 nm) when optimized for a fabrication resolution of 50 nm, and under 0.3 dB in a 350 nm extended bandwidth (1350–1700 nm) for a 100 nm resolution. Moreover, analysis of fabrication tolerances shows robust operation for the fundamental mode to etching errors up to ± 20 nm. A proof-of-concept device provides an initial validation of its operation principle, showing experimental excess losses lower than 0.2 dB in a 195 nm bandwidth for the best-case resolution scenario (i.e., 50 nm).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-Performance On-Chip Silicon Beamsplitter Based on Subwavelength Metamaterials for Enhanced Fabrication Tolerance

et al. 2021

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“…A broad bandwidth of ~120 nm has been theoretically achieved for a two-mode (De)MUX via an SWGbased ADC [15]. Besides, two broadband mode (De)MUXs have been experimentally demonstrated based on the SWG engineered MMI coupler [16], and SWG-slot assisted AC [17], which achieves a broad bandwidth of >100 nm. To further increase the bandwidth, we proposed and optimized a twomode (De)MUX based on a triple-waveguide ADC incorporating a SWG structure, which can numerically achieve an ultra-broad 3-dB bandwidth of 320 nm [18].…”

Section: Introductionmentioning

confidence: 99%

Broadband Silicon Four-Mode (De)Multiplexer Using Subwavelength Grating-Assisted Triple-Waveguide Couplers

Jiang

Mao

et al. 2021

J. Lightwave Technol.

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A broadband silicon four-mode (de)multiplexer [(De)MUX] is proposed and experimentally demonstrated based on subwavelength gratings (SWGs)-assisted triple-waveguide couplers (TWCs), which can (de)multiplex TE0, TE1, TE2, and TE3 modes. The mode interaction is enhanced, benefitting from both the triple-waveguide coupling and subwavelength structures. The proposed four-mode (De)MUX is composed of three SWG-assisted TWCs connected by three linear tapers. The experimental results show that the 3-dB bandwidths are 100 nm, 76 nm, 90 nm, and 95 nm for the TE0, TE1, TE2, and TE3 modes, respectively. The corresponding insertion losses are 0.2, 1.8, 1.3, and 1.7 dB, and the mode crosstalks are -23.3, -17.7, -15.5, and -17.0 dB at the 1550 nm wavelength. The proposed device can work as a mode-(De)MUX compatible with wavelength division multiplexing (WDM) to increase the transmission capacity of on-chip optical interconnects.

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“…In this work, we present the fundamentals of this technology and its application to the design of several high-performance photonic devices. Firstly, we report on an ultra-broadband phase shifter [3], and on a mode converter and multiplexer/demultiplexer based on a subwavelength engineered multimode interference coupler [4]. Then, we introduce tilted SWG metamaterials, which provide an additional degree of freedom in the design by enabling to tailor the anisotropic response of the optical medium [5].…”

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confidence: 99%

Ultra-broadband silicon photonics devices based on subwavelength metamaterials -INVITED

et al. 2020

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Experimental demonstration of a broadband mode converter and multiplexer based on subwavelength grating waveguides

Cited by 33 publications

References 42 publications

High-Performance On-Chip Silicon Beamsplitter Based on Subwavelength Metamaterials for Enhanced Fabrication Tolerance

High-Performance On-Chip Silicon Beamsplitter Based on Subwavelength Metamaterials for Enhanced Fabrication Tolerance

Broadband Silicon Four-Mode (De)Multiplexer Using Subwavelength Grating-Assisted Triple-Waveguide Couplers

Ultra-broadband silicon photonics devices based on subwavelength metamaterials -INVITED

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