100-GBd Waveguide Bragg Grating Modulator in Thin-Film Lithium Niobate

Pohl, David; Messner, Andreas; Kaufmann, Fabian; Escalé, Marc Reig; Holzer, Jannis; Leuthold, Juerg; Grange, Rachel

doi:10.1109/lpt.2020.3044648

Cited by 51 publications

(43 citation statements)

References 25 publications

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“…The potential of LNOI for the realization of modulators was recognized early. [49] Modulator concepts can be based on resonators, where the applied voltage shifts the resonance frequency, such that the transmission of an adjacent bus waveguide can be modulated, [148,149] on interferometers, where the phase shift induced by a phase-only modulator in one of the arms [150,151] leads to amplitude modulation at the interferometer output, [86,149] or on Bragg reflectors, where the applied voltage shifts the reflection band [152] or cavity resonances. [153] Examples for these realization concepts are shown [149] b) scheme and microscope image of modulator for amplitude and phase based on interferometer quadrature, [147] and c) modulator based on tunable Bragg grating.…”

Section: Active Manipulationmentioning

confidence: 99%

“…[153] Examples for these realization concepts are shown [149] b) scheme and microscope image of modulator for amplitude and phase based on interferometer quadrature, [147] and c) modulator based on tunable Bragg grating. [152] (a) Reproduced with permission. [149] Copyright 2018, The Optical Society.…”

Section: Active Manipulationmentioning

confidence: 99%

“…Modulators implemented in LNOI. a) Racetrack and ring resonators,[149] b) scheme and microscope image of modulator for amplitude and phase based on interferometer quadrature,[147] and c) modulator based on tunable Bragg grating [152]. (a) Reproduced with permission [149].…”

mentioning

confidence: 99%

“…Copyright 2020, The Author(s), published by Springer Nature. (c) Reproduced under the terms of a Creative Commons Attribution 4.0 International License [152]. Copyright 2020, The Author(s), published by IEEE.…”

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confidence: 99%

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Lithium Niobate on Insulator: An Emerging Platform for Integrated Quantum Photonics

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Section: Active Manipulationmentioning

confidence: 99%

Section: Active Manipulationmentioning

confidence: 99%

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confidence: 99%

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Lithium Niobate on Insulator: An Emerging Platform for Integrated Quantum Photonics

Saravi

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2021

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“…High quality LNOI nanocavities and modulators have been demonstrated with photonic crystal nanobeam waveguides (24,25). An alternative approach, based on sidewall-modulated photonic wires similar to silicon-on-insulator (SOI), has been simultaneously pursued for integrated Bragg grating filters and modulators in LNOI (26)(27)(28)(29). The sidewall modulated grating technology affords enhanced mechanical stability as well as good reproducibility, scalability and CMOS compatibility of the device fabrication process.…”

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Tunable Ultranarrowband Grating Filters in Thin-Film Lithium Niobate

2021

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Several applications in modern photonics require compact on-chip optical filters with a tailored spectral response. However, achieving sub-nanometric bandwidths and high extinction ratios is particularly challenging, especially in low-footprint device formats. Phase shifted Bragg gratings implemented by sidewall modulation of photonic nanowire waveguides are a good solution for on-chip narrowband operation with reasonable requirements in fabrication and scalability. In this work we report on their implementation and optimization in thin film lithium niobate, a photonic platform that affords reconfigurability by exploiting electrooptic effects. The phase-shifted Bragg grating filters have a footprint smaller than 1 μm× 1mm and operate at telecom wavelengths, featuring extinction ratios up to 25 dB. We demonstrate transmission bandwidths as narrow as 14.4 pm (Q = 1.1 x 10 5 ) and 8.8 pm (Q = 1.76 x 10 5 ) in critically coupled structures and multi-wavelength Fabry-Perot configurations, respectively, in full agreement with theoretical predictions. Moreover, by taking advantage of the strong electrooptic effect in lithium niobate, in combination with the tight light confinement of nanophotonic wires and the ultranarrow spectral resonances of optimized grating structures, we demonstrate a tunability of 25.1pm/V and a record modulation of the filter transmission amounting to 1.72 dB/V at CMOS voltages. The results pave the way for reconfigurable narrowband photonic filters in lithium niobate with small footprint and low consumption, to be exploited towards on-chip quantum and nonlinear optics, as well as optical sensing and microwave photonics.

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Design of Ultracompact High‐Speed‐Integrated Lithium–Niobate Periodic Dielectric Waveguide Modulator

Zhang

Jia

et al. 2022

Advanced Photonics Research

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Modern communications and microwave photonics require compact electro‐optic modulators with ultrahigh bandwidth and low power consumption. These requirements can be satisfied by integrated lithium–niobate electro‐optic modulators with high bandwidth and low power consumption. However, most integrated lithium–niobate modulators cannot achieve a good balance between an ultracompact size and a high modulation bandwidth. These challenges are overcome by designing an integrated lithium–niobate periodic dielectric waveguide modulator, featuring a compact modulation length of 87.4 μm, a theoretical modulation bandwidth over 600 GHz, a voltage‐length product of 0.0874 V cm, and a high sideband suppression ratio up to 36.1 dB. These performances are achieved by taking advantage of a capacitor configuration consisting of a nonresonant periodic dielectric waveguides sandwiched between two indium tin oxide (ITO) electrodes. This design provides an ultrabroadband and compact solution to next‐generation communications and microwave photonics.

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100-GBd Waveguide Bragg Grating Modulator in Thin-Film Lithium Niobate

Cited by 51 publications

References 25 publications

Lithium Niobate on Insulator: An Emerging Platform for Integrated Quantum Photonics

Lithium Niobate on Insulator: An Emerging Platform for Integrated Quantum Photonics

Tunable Ultranarrowband Grating Filters in Thin-Film Lithium Niobate

Design of Ultracompact High‐Speed‐Integrated Lithium–Niobate Periodic Dielectric Waveguide Modulator

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