Integrated optical frequency comb technologies

Chang, Lin; Liu, Songtao; Bowers, John E.

doi:10.1038/s41566-021-00945-1

Cited by 347 publications

(151 citation statements)

References 152 publications

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“…Integrated photonics is profoundly impacting data communication and signal processing 8 – 10 . A crucial development in the past decade is the demonstration of Kerr microcombs, which provide mutually coherent and equidistant optical frequency lines generated by microresonators 1 , 11 , 12 . With a wide range of microcomb-based optoelectronic systems 2 , 4 , 13 – 18 demonstrated recently, these integrated light sources hold the promise to extend the application space of integrated photonics to a much broader scope.…”

Section: Mainmentioning

confidence: 99%

Microcomb-driven silicon photonic systems

Shu

Chang

Tao

et al. 2022

Nature

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208

116

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Microcombs have sparked a surge of applications over the past decade, ranging from optical communications to metrology1–4. Despite their diverse deployment, most microcomb-based systems rely on a large amount of bulky elements and equipment to fulfil their desired functions, which is complicated, expensive and power consuming. By contrast, foundry-based silicon photonics (SiPh) has had remarkable success in providing versatile functionality in a scalable and low-cost manner5–7, but its available chip-based light sources lack the capacity for parallelization, which limits the scope of SiPh applications. Here we combine these two technologies by using a power-efficient and operationally simple aluminium-gallium-arsenide-on-insulator microcomb source to drive complementary metal–oxide–semiconductor SiPh engines. We present two important chip-scale photonic systems for optical data transmission and microwave photonics, respectively. A microcomb-based integrated photonic data link is demonstrated, based on a pulse-amplitude four-level modulation scheme with a two-terabit-per-second aggregate rate, and a highly reconfigurable microwave photonic filter with a high level of integration is constructed using a time-stretch approach. Such synergy of a microcomb and SiPh integrated components is an essential step towards the next generation of fully integrated photonic systems.

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Section: Mainmentioning

confidence: 99%

Microcomb-driven silicon photonic systems

Shu

Chang

Tao

et al. 2022

Nature

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208

116

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“…The use of mechanical modes with stronger optomechanical coupling coefficient [17] and squeezed light [31] can reduce shot noise and expand the thermal noise dominant regime. Integrated waveguide-coupled microcavities [61] and on-chip arrays of sensors can be used in the future, for photoacoustic imaging and spectroscopy [2][3][4]. This work broadens the frequency range of ultrasound detection in air, which is of great significance for applications in gas photoacoustic spectroscopy, and non-contact ultrasonic medical imaging, etc.…”

Section: Discussionmentioning

confidence: 99%

High sensitivity air-coupled MHz frequency ultrasound detection using on-chip microcavities

Hao¹,

Hu²,

Lei³

et al. 2022

Preprint

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Cavity optomechanical systems provide an ideal platform for ultrasound sensing, due to its dualresonance enhanced sensitivity. Here we realize high sensitivity air-coupled ultrasound sensing in the megahertz (MHz) frequency range, using a microtoroid cavity. Benefitting from both the high optical Q factor (∼10 7 ) and mechanical Q factor (∼700), we achieve sensitivity of 46 µPa/Hz 1/2 -10 mPa/Hz 1/2 in a frequency range of 0.25-3.2 MHz. Thermal-noise-limited sensitivity is realized around the mechanical resonance at 2.56 MHz, in a frequency range of 0.6 MHz. We also observe the second-and third-order mechanical sidebands, when driving the microcavity with an ultrasonic wave at the mechanical resonance and quantitatively study the intensities of each mechanical sideband as a function of the mechanical displacement. Measuring the combination of signal to noise ratios at all the sidebands has the potential to extend the dynamic range of displacement sensing.

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“…The generated IAPs have been reported so far with a limited bandwidths and mostly from bulk crystals. For instance, the predicted IAPs in recent theoretical works were found to cover the energy windows (16)(17)(18)(19)(20) eV in MoS 2 [27], (20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35) eV and (17.5-43) eV in bulk MgO [28,29], which in general are insufficient for time-resolved measurements on unprecedented time-scales.…”

Section: Introductionmentioning

confidence: 98%

Generation of Super Intense Isolated Attosecond Pulses from Trapped Electrons in Metal Surfaces

Adnani,

Taoutioui,

Makhoute

et al. 2022

Preprint

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Generation of ultrabroadband isolated attosecond pulses (IAPs) is essential for time-resolved applications in chemical and material sciences, as they have the potential to access the spectral water window region of chemical elements, which yet has to be established. Here we propose a numerical scheme for highly efficient high-order harmonic generation (HHG) and hence the generation of ultrabroadband IAPs in the XUV and soft x-ray regions. The scheme combines the use of chirped pulses with trapped electrons in copper transition-metal surfaces and takes advantage of the characteristic features of an infrared (IR) single-cycle pulse to achieve high conversion efficiencies and large spectral bandwidths. In particular, we show that ultrabroad IAPs with a duration of 370 as and with a bandwidth covering the photon energy range of 50-250 and 350-450 eV can be produced. We further show that introducing an additional IR single cycle pulse permits to enhance the harmonic yield in the soft x-ray photon energy region by almost 7 order of magnitude. Our findings thus elucidate the relevance of trapped electrons in metal surfaces for developing stable and highly efficient attosecond light sources in compact solid-state devices.

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Integrated optical frequency comb technologies

Cited by 347 publications

References 152 publications

Microcomb-driven silicon photonic systems

Microcomb-driven silicon photonic systems

High sensitivity air-coupled MHz frequency ultrasound detection using on-chip microcavities

Generation of Super Intense Isolated Attosecond Pulses from Trapped Electrons in Metal Surfaces

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