Experimental characterization of an ultra-broadband dual-mode symmetric Y–junction based on metamaterial waveguides

Cabo, Raquel Fernández de; Vilas, Jaime; Cheben, Pavel; Velasco, Aitor V.; González-Andrade, David

doi:10.1016/j.optlastec.2022.108742

Cited by 10 publications

(6 citation statements)

References 61 publications

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“…Among standout devices, Ozcan et al recently reported a polarization-independent Y-junction, achieving low losses (EL < 0.25 dB) and a device length of only 14 µm, but bandwidth is limited to 100 nm. [18] The widest experimental bandwidth (170 nm) is achieved by [26] , still 80 nm smaller than our TE1 performance, and still at the expense of greater losses, larger footprint, and no TM operation. The widest simulated performance is achieved by [24] , although no experimental validation is provided, no TE1 operation is provided, and bandwidth is defined for a larger loss threshold.…”

Section: Discussionmentioning

confidence: 81%

“…Tapered coupler [52] 13 150 TE0 100 (1500 -1600) < 0.07 80 (1520 -1600) < 1.50 TE1 † < 0.41 MMI [40] 35.9 100 TE0 160 (1260 -1420) < 1.00 NF NF TM0 Y-junction [18] 14 120 TE0 150 (1500 -1650) < 0.10 100 (1500 -1600) < 0.25 TM0 < 0.23 Y-junction [26] 41. The SWG-assisted symmetric Y-junction presented in this work is expected to unlock new possibilities for a myriad of applications requiring both broad bandwidth and precise power control, especially for multimode applications and/or those with multiple or cascaded power splitting stages.…”

Section: Device Length [µM] Mfs [Nm] Modes Bwsim [Nm] Elsim [Db] Bwex...mentioning

confidence: 99%

“…[17] These solutions range from tapered and slotted waveguides, [18][19][20][21] to particle swarm optimization algorithm, [17,22] photonic crystals, [23] or subwavelength gratings (SWG). [24][25][26] Notably, since their first demonstration in silicon photonics, SWG metamaterials have turned into a powerful tool to precisely control light at the nanoscale. [27] These metamaterials consist of a periodic lattice of different dielectric materials spaced at a distance shorter than half the effective wavelength of the propagating light, which allows tailoring refractive index, dispersion, and anisotropy by modifying the geometrical parameters.…”

Section: Introductionmentioning

confidence: 99%

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Y-junction beamsplitter engineered through subwavelength metamaterials

Cabo

González-Andrade

Cheben

et al. 2021

Integrated Optics: Design, Devices, Systems and Applications VI

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Power splitters play a crucial role in virtually all photonic circuits, enabling precise control of on-chip signal distribution. However, state-of-the-art solutions typically present trade-offs in terms of loss, bandwidth, and fabrication robustness, especially when targeting multimode operation. Here, we present a novel multimode 3-dB power splitter based on a symmetric Y-junction assisted by subwavelength grating metamaterials. The inclusion of the metamaterial structure circumvents the practical limitations of conventional Y-junction tips and realizes smooth modal transitions. Simulations for a standard 220-nm-thick silicon-on-insulator platform predict minimal excess loss (< 0.2 dB) for the fundamental and the first-order transverse-electric modes over an ultra-broad 700 nm bandwidth (1300 -2000 nm). For the fundamental transverse-magnetic mode, losses are less than 0.3 dB in the 1300 -1800 nm range. Experimental measurements validate these predictions in the 1430 -1630 nm wavelength range, demonstrating losses < 0.4 dB for all three modes, even in the presence of fabrication deviations of up to ±10 nm. We believe that this device is suitable for the implementation of advanced photonic systems requiring high-performance distribution of optical signals.Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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Section: Discussionmentioning

confidence: 81%

Section: Device Length [µM] Mfs [Nm] Modes Bwsim [Nm] Elsim [Db] Bwex...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Y-junction beamsplitter engineered through subwavelength metamaterials

Cabo

González-Andrade

Cheben

et al. 2021

Integrated Optics: Design, Devices, Systems and Applications VI

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“…SWG consist of periodic arrangements of core and cladding materials, with a pitch (Λ) significantly smaller than the operational wavelength (λ). This configuration suppresses diffractive effects and behaves as a metamaterial that enables dispersion and refractive index engineering through geometrical design [15]- [17]. SWGbased DCs have been successfully designed and fabricated before, achieving unprecedented performance milestones.…”

Section: Introductionmentioning

confidence: 99%

Low-Loss Directional Coupler for the C, L and U Bands Based on Subwavelength Gratings

Vilas,

Fernández de Cabo,

Olivares

et al. 2023

IEEE Photon. Technol. Lett.

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Directional couplers are ubiquitous components for power distribution in silicon photonics integrated circuits. Despite significant advances in their performance, architectures providing tailorable coupling ratios over increasingly broad bandwidths are still sought after. Compact footprint and low losses are also essential features for circuits comprising multiple coupling stages. In this work, we propose a compact directional coupler with arbitrary coupling ratio, based on dispersion engineering through subwavelength metamaterials. Low losses and a flat spectral response over a broad bandwidth are experimentally demonstrated for multiple coupling ratios between 0.08 and 1. Results show average excess losses below 0.24 dB and coupling ratio deviations below ±1 dB for a 170 nm bandwidth completely covering C, L and U telecommunication bands (1505 -1675 nm).

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“…Its possible applications to communications have been studied by many researchers in various areas, for example, in microwave filters [5] - [10], power dividers [11] - [14] and antennas [15] - [22], and others several potential applications. Studies of the modes of propagation of electromagnetic waves using metamaterials as waveguides have also been reported [23] - [31]. Now well, making the first target materials had to wait until the early 2000s when a compound with negative refractive index operating in a frequency band in the range of microwaves were demonstrated [32] - [34].…”

Section: Introductionmentioning

confidence: 99%

Theoretical model for the transmittance in a left-handed metamaterial of different geometries

Salazar

2023

J. Microw. Optoelectron. Electromagn. Appl.

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In this work, a theoretical model for the transmittance in a left-handed metamaterial of different geometries is presented. The proposed unit cells are a combination of conducting wires of rectangular cross-section with square-ring and hexagonal resonators. In this new dielectric compound, dependence of transmittance on the thickness of the resonators are analyzed for the particular case of normal incidence in the GHz range. It is found that the transmittance for the hexagonal resonator shows a significant increase compared to the square geometry resonator.

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Experimental characterization of an ultra-broadband dual-mode symmetric Y–junction based on metamaterial waveguides

Cited by 10 publications

References 61 publications

Y-junction beamsplitter engineered through subwavelength metamaterials

Y-junction beamsplitter engineered through subwavelength metamaterials

Low-Loss Directional Coupler for the C, L and U Bands Based on Subwavelength Gratings

Theoretical model for the transmittance in a left-handed metamaterial of different geometries

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