Kerr soliton microcombs have the potential to disrupt a variety of applications such as ultra-high-speed optical communications,ultra-fast distance measurements,massively parallel light detection and ranging(LiDAR)or ...Kerr soliton microcombs have the potential to disrupt a variety of applications such as ultra-high-speed optical communications,ultra-fast distance measurements,massively parallel light detection and ranging(LiDAR)or high-resolution optical spectroscopy.Similarly,ultra-broadband photonic-electronic signal processing could also benefit from chip-scale frequency comb sources that offer wideband optical emission along with ultra-low phase noise and timing jitter.However,while photonic analogue-to-digital converters(ADC)based on femtosecond lasers have been shown to overcome the jitter-related limitations of electronic oscillators,the potential of Kerr combs in photonic-electronic signal processing remains to be explored.In this work,we demonstrate a microcomb-based photonic-electronic ADC that combines a high-speed electro-optic modulator with a Kerr comb for spectrally sliced coherent detection of the generated optical waveform.The system offers a record-high acquisition bandwidth of 320 GHz,corresponding to an effective sampling rate of at least 640GSa/s.In a proof-of-concept experiment,we demonstrate the viability of the concept by acquiring a broadband analogue data signal comprising different channels with centre frequencies between 24 GHz and 264 GHz,offering bit error ratios(BER)below widely used forward-error-correction(FEC)thresholds.To the best of our knowledge,this is the first demonstration of a microcomb-based ADC,leading to the largest acquisition bandwidth demonstrated for any ADC so far.展开更多
The dissipative Kerr soliton microcomb provides a promising laser source for wavelength-division multiplexing(WDM)communication systems thanks to its compatibility with chip integration.However,the soliton microcomb c...The dissipative Kerr soliton microcomb provides a promising laser source for wavelength-division multiplexing(WDM)communication systems thanks to its compatibility with chip integration.However,the soliton microcomb commonly suffers from a low-power level due to the intrinsically limited energy conversion efficiency from the continuous-wave pump laser to ultra-short solitary pulses.Here,we exploit laser injection locking to amplify and equalize dissipative Kerr soliton comb lines,superior gain factor larger than 30 dB,and optical-signal-to-noise-ratio(OSNR)as high as 60 dB obtained experimentally,providing a potential pathway to constitute a high-power chip-integrated WDM laser source for optical communications.展开更多
Kerr frequency combs, or microcombs, are revolutionizing fields such as precision metrology, optical clocks, and astronomical spectrometer calibration. However, conventional dissipative Kerr soliton(DKS) microcombs of...Kerr frequency combs, or microcombs, are revolutionizing fields such as precision metrology, optical clocks, and astronomical spectrometer calibration. However, conventional dissipative Kerr soliton(DKS) microcombs often suffer from limited conversion efficiency and low output power, and achieving deterministic single-soliton generation remains a challenge due to limited thermal accessibility arising from the intricate interplay of Kerr and thermal effects. In this work, we present an optimized microresonator design combined with a robust pumping scheme to enhance the thermal accessibility of single-soliton states for deterministic generation. By operating a silicon nitride microresonator with tailored dispersion in the over-coupled regime, we demonstrate a thermally accessible pathway to single solitons with high conversion efficiency(approaching 30%), and high output power(up to 50 m W). Through a pump forward-tuning process with power ramping, followed by backward tuning, we achieve deterministic single-soliton generation across 80 consecutive trials via automated laser tuning, eliminating the need for complex thermal compensation or rapid tuning schemes. Our work provides a straightforward and robust solution for generating high-power solitons, advancing the practicality and accessibility of microcombs for real-world applications.展开更多
Mid-infrared(MIR)Kerr microcombs are of significant interest for portable dual-comb spectroscopy and precision molecular sensing due to strong molecular vibrational absorption in the MIR band.However,achieving a compa...Mid-infrared(MIR)Kerr microcombs are of significant interest for portable dual-comb spectroscopy and precision molecular sensing due to strong molecular vibrational absorption in the MIR band.However,achieving a compact,octave-spanning MIR Kerr microcomb remains a challenge due to the lack of suitable MIR photonic materials for the core and cladding of integrated devices and appropriate MIR continuous-wave(CW)pump lasers.Here,we propose a novel slot concentric dual-ring(SCDR)microresonator based on an integrated chalcogenide glass chip,which offers excellent transmission performance and flexible dispersion engineering in the MIR band.This device achieves both phase-matching and group velocity matching in two separated anomalous dispersion regions,enabling phase-locked,two-color solitons in the MIR region with a commercial 2-μm CW laser as the pump source.Moreover,the spectral locking of the two-color soliton enhances pump wavelength selectivity,providing precise control over soliton dynamics.By leveraging the dispersion characteristics of the SCDR microresonator,we have demonstrated a multi-octave-spanning,two-color soliton microcomb,covering a spectral range from 1156.07 to 5054.95 nm(200 THz)at a-40 dB level,highlighting the versatility and broad applicability of our approach.And the proposed multi-octave MIR frequency comb is relevant for applications such as dual-comb spectroscopy and trace-gas sensing.展开更多
基金supported by the ERC Consolidator Grant TeraSHAPE(#773248)the H2020 project TeraSlice(#863322)+10 种基金by the EIC Transition projects MAGNIFY(#101113302),HDLN(#101113260),and CombTools(#101136978)by the H2020 Marie Skłodowska-Curie Innovative Training Network“MICROCOMB”(#812818)by the Deutsche Forschungsgemeinschaft(DFG)project PACE(#403188360)within the Priority Programme“Electronic-Photonic Integrated Systems for Ultrafast Signal Processing”(SPP 2111)by the DFG Collaborative Research Centre(CRC)WavePhenomena(SFB 1173,Project-ID 258734477)by the BMBF project Open6GHub(#16KISK010)by the Alfried Krupp von Bohlen und Halbach-Stiftungby the Max-Planck School of Photonics(MPSP)by the European Regional Development Fund(ERDF,grant EFRE/FEIH_776267)the Deutsche Forschungsgemeinschaft(DFGgrants DFG/INST 121384/166-1 and DFG/INST 121384/167-1The Si3N4 samples were fabricated in the Centre of MicroNano Technology(CMi)at EPFL.
文摘Kerr soliton microcombs have the potential to disrupt a variety of applications such as ultra-high-speed optical communications,ultra-fast distance measurements,massively parallel light detection and ranging(LiDAR)or high-resolution optical spectroscopy.Similarly,ultra-broadband photonic-electronic signal processing could also benefit from chip-scale frequency comb sources that offer wideband optical emission along with ultra-low phase noise and timing jitter.However,while photonic analogue-to-digital converters(ADC)based on femtosecond lasers have been shown to overcome the jitter-related limitations of electronic oscillators,the potential of Kerr combs in photonic-electronic signal processing remains to be explored.In this work,we demonstrate a microcomb-based photonic-electronic ADC that combines a high-speed electro-optic modulator with a Kerr comb for spectrally sliced coherent detection of the generated optical waveform.The system offers a record-high acquisition bandwidth of 320 GHz,corresponding to an effective sampling rate of at least 640GSa/s.In a proof-of-concept experiment,we demonstrate the viability of the concept by acquiring a broadband analogue data signal comprising different channels with centre frequencies between 24 GHz and 264 GHz,offering bit error ratios(BER)below widely used forward-error-correction(FEC)thresholds.To the best of our knowledge,this is the first demonstration of a microcomb-based ADC,leading to the largest acquisition bandwidth demonstrated for any ADC so far.
基金supported by the National Key R&D Program of China(Nos.2019YFB-2203103 and 2018YFA0307400)the National Natural Science Foundation of China(NSFC)(Nos.62001086 and 61705033)。
文摘The dissipative Kerr soliton microcomb provides a promising laser source for wavelength-division multiplexing(WDM)communication systems thanks to its compatibility with chip integration.However,the soliton microcomb commonly suffers from a low-power level due to the intrinsically limited energy conversion efficiency from the continuous-wave pump laser to ultra-short solitary pulses.Here,we exploit laser injection locking to amplify and equalize dissipative Kerr soliton comb lines,superior gain factor larger than 30 dB,and optical-signal-to-noise-ratio(OSNR)as high as 60 dB obtained experimentally,providing a potential pathway to constitute a high-power chip-integrated WDM laser source for optical communications.
基金European Research Council(853522)HORIZON EUROPE European Innovation Council(101047289)+4 种基金Danmarks Grundforskningsfond(DNRF123)Villum Fonden(VIL50469)Innovationsfonden(2079-00040B)Danmarks Frie Forskningsfond(3164-00307A)Staatssekretariat für Bildung,Forschung und Innovation(CSOC).
文摘Kerr frequency combs, or microcombs, are revolutionizing fields such as precision metrology, optical clocks, and astronomical spectrometer calibration. However, conventional dissipative Kerr soliton(DKS) microcombs often suffer from limited conversion efficiency and low output power, and achieving deterministic single-soliton generation remains a challenge due to limited thermal accessibility arising from the intricate interplay of Kerr and thermal effects. In this work, we present an optimized microresonator design combined with a robust pumping scheme to enhance the thermal accessibility of single-soliton states for deterministic generation. By operating a silicon nitride microresonator with tailored dispersion in the over-coupled regime, we demonstrate a thermally accessible pathway to single solitons with high conversion efficiency(approaching 30%), and high output power(up to 50 m W). Through a pump forward-tuning process with power ramping, followed by backward tuning, we achieve deterministic single-soliton generation across 80 consecutive trials via automated laser tuning, eliminating the need for complex thermal compensation or rapid tuning schemes. Our work provides a straightforward and robust solution for generating high-power solitons, advancing the practicality and accessibility of microcombs for real-world applications.
基金National Natural Science Foundation of China(NSFC)(Grant Nos.62375292 and 61975242)Natural Science Foundation of Guangdong Province for Distinguished Young Scholars(No.2023B1515020028)Fund of Sun Yat-sen University(No.12240012).
文摘Mid-infrared(MIR)Kerr microcombs are of significant interest for portable dual-comb spectroscopy and precision molecular sensing due to strong molecular vibrational absorption in the MIR band.However,achieving a compact,octave-spanning MIR Kerr microcomb remains a challenge due to the lack of suitable MIR photonic materials for the core and cladding of integrated devices and appropriate MIR continuous-wave(CW)pump lasers.Here,we propose a novel slot concentric dual-ring(SCDR)microresonator based on an integrated chalcogenide glass chip,which offers excellent transmission performance and flexible dispersion engineering in the MIR band.This device achieves both phase-matching and group velocity matching in two separated anomalous dispersion regions,enabling phase-locked,two-color solitons in the MIR region with a commercial 2-μm CW laser as the pump source.Moreover,the spectral locking of the two-color soliton enhances pump wavelength selectivity,providing precise control over soliton dynamics.By leveraging the dispersion characteristics of the SCDR microresonator,we have demonstrated a multi-octave-spanning,two-color soliton microcomb,covering a spectral range from 1156.07 to 5054.95 nm(200 THz)at a-40 dB level,highlighting the versatility and broad applicability of our approach.And the proposed multi-octave MIR frequency comb is relevant for applications such as dual-comb spectroscopy and trace-gas sensing.
