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  • 1.
    Deriushkina, Ekaterina
    et al.
    Chalmers University of Technology, Sweden.
    Rebolledo-Salgado, Israel
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Mazur, Mikael
    Nokia Bell Labs, USA.
    Torres-Company, Victor
    Chalmers University of Technology, Sweden.
    Andrekson, Peter
    Chalmers University of Technology, Sweden.
    Schroder, Jochen
    Chalmers University of Technology, Sweden.
    Karlsson, Magnus
    Chalmers University of Technology, Sweden.
    Dual-Comb Swept-Wavelength Interferometry: Theory and Experiment2022In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 40, no 19, p. 6508-6516Article in journal (Refereed)
    Abstract [en]

    Much efforts have been put to elaborate and improve different high precision measurement schemes for characterization of advanced photonic devices and optical fibers with increasing bandwidth requirements. In light of this, swept-wavelength interferometry and dual-comb spectroscopy have been extensively applied in characterization procedures. In this paper we present in detail an experimental scheme that combines these two techniques and overcomes their limitations by using a tunable laser source in order to sweep over the frequency comb spacing and capture all intermediate frequencies. We demonstrate full-field broadband measurements over 1.25 THz comb bandwidth with increased frequency resolution, which can be performed in only 5 ms sweep. We also show that the nonlinearity of the laser sweep can be removed without an auxiliary interferometer in the setup. 

  • 2.
    Rebolledo-Salgado, Israel
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Durán, Vicente
    University Jaume I, Spain.
    Helgason, Óskar Bjarki
    Chalmers University of Technology, Sweden.
    Girardi, Marcello
    Chalmers University of Technology, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Torres-Company, Victor
    Chalmers University of Technology, Sweden.
    Thermal-Controlled Scanning of a Bright Soliton in a Photonic Molecule2023In: 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023, Institute of Electrical and Electronics Engineers Inc. , 2023Conference paper (Other academic)
    Abstract [en]

    Over the last few years, dissipative Kerr solitons (DKS) in microresonators have boosted the development of chip-scale frequency comb sources (microcombs) in a variety of applications, from coherent communications to ultrafast distance ranging [1]. However, the intrinsic large free spectral range (FSR) of microcombs (within the gigahertz regime) is still a drawback for applications such as molecular spectroscopy, in which the comb line spacing dictates the spectral sampling resolution. Overcoming spectral sparsity by scanning the comb modes across a full FSR is challenging for a DKS microcomb, since the soliton operation must be kept while the pump laser is continuously swept. So far, it has been accomplished for a single microresonator by combining a feedback control loop with the thermal tuning of the cavity resonances by means of a microheater [2]. Recently, the use of two linearly coupled cavities (a photonic molecule) has shown to be a promising alternative to generate soliton microcombs with high conversion efficiency and uniform power distribution [3]. In this contribution, we address the challenge of scanning the soliton comb modes of a photonic molecule by thermal tuning. Specifically, we implement a scheme to scan a bright soliton over 60 GHz by tuning simultaneously the pump laser and the resonances of two coupled cavities.

  • 3.
    Rebolledo-Salgado, Israel
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Helgason, ÓB.
    Chalmers University of Technology, Sweden.
    Ye, Z.
    Chalmers University of Technology, Sweden.
    Schröder, J.
    Chalmers University of Technology, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Torres-Company, V.
    Chalmers University of Technology, Sweden.
    Photonic molecule microcombs at 50 GHz repetition rate2022In: Optics InfoBase Conference Papers, Optica Publishing Group (formerly OSA) , 2022, article id SW4O.8Conference paper (Refereed)
    Abstract [en]

    We present a microcomb in a photonic molecule with 50 GHz repetition rate. The comb attains > 50% power conversion efficiency and displays a quiet point of operation in repetition rate with decreased phase noise. © 2022 The Author(s)

  • 4.
    Rebolledo-Salgado, Israel
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Quevedo-Galan, Clara
    Universidad Politécnica de Madrid, Spain.
    Helgason, Óskar Bjarki
    Chalmers University of Technology, Sweden.
    Lööf, Anton
    Chalmers University of Technology, Sweden.
    Ye, Zhichao
    Chalmers University of Technology, Sweden.
    Lei, Fuchuan
    Chalmers University of Technology, Sweden.
    Schröder, Jochen
    Chalmers University of Technology, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Torres-Company, Victor
    Chalmers University of Technology, Sweden.
    Platicon dynamics in photonic molecules2023In: Communications Physics, E-ISSN 2399-3650, Vol. 6, no 1, article id 303Article in journal (Refereed)
    Abstract [en]

    Coherent dissipative structures known as platicons can be reliably generated in photonic molecules, resulting in deterministic and reproducible microcombs derived from a continuous-wave pump. However, the supermode spectrum of standard photonic molecules displays numerous avoided mode crossings, distorting the spectral envelope of platicon microcombs. Here, we obtain a platicon microcomb using a photonic molecule configuration based on two coupled microcavities, whose size differs by an order of magnitude. This results in an engineered microcomb spectrum that closely resembles the one generated in an ideal single microresonator with just one frequency mode shift. We observe the coupling between the repetition rate of the platicon microcomb with the frequency of the pump laser, an effect originating from the dispersive-wave recoil induced by mode crossings. Using two identical platicon microcombs, we make use of such coupling to realize dual-comb interferometry. These results contribute to understanding dissipative structures in normal-dispersion microresonators and offer an alternative to applications such as spectroscopy and metrology. 

  • 5.
    Rebolledo-Salgado, Israel
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Ye, Z.
    Chalmers University of Technology, Sweden.
    Christensen, S.
    DTU Technical University of Denmark, Denmark.
    Lei, F.
    Chalmers University of Technology, Sweden.
    Twayana, K.
    Zelan, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Schröder, J.
    Chalmers University of Technology, Sweden.
    Torres-Company, V.
    Chalmers University of Technology, Sweden.
    Nonlinear broadening of electro-optic frequency combs in all-normal dispersion Si3N4 waveguides2021In: Optics InfoBase Conference Papers, The Optical Society , 2021Conference paper (Refereed)
  • 6.
    Rebolledo-Salgado, Israel
    et al.
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Ye, Zhichao
    Chalmers University of Technology, Sweden.
    Christensen, Simon
    DTU Technical University of Denmark, Denmark.
    Lei, Fuchuan
    Chalmers University of Technology, Sweden.
    Twayana, Krishna
    Chalmers University of Technology, Sweden.
    Schröder, Jochen
    Chalmers University of Technology, Sweden.
    Zelan, Martin
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology.
    Torres-Company, Victor
    Chalmers University of Technology, Sweden.
    Coherent supercontinuum generation in all-normal dispersion Si3N4 waveguides2022In: Optics Express, E-ISSN 1094-4087, Vol. 30, no 6, p. 8641-8651Article in journal (Refereed)
    Abstract [en]

    Spectral broadening of optical frequency combs with high repetition rate is of significant interest in optical communications, radio-frequency photonics and spectroscopy. Silicon nitride waveguides (Si3N4) in the anomalous dispersion region have shown efficient supercontinuum generation spanning an octave-bandwidth. However, the broadening mechanism in this regime is usually attained with femtosecond pulses in order to maintain the coherence. Supercontinuum generation in the normal dispersion regime is more prone to longer (ps) pulses, but the implementation in normal dispersion silicon nitride waveguides is challenging as it possesses strong requirements in propagation length and losses. Here, we experimentally demonstrate the use of a Si3N4 waveguide to perform coherent spectral broadening using pulses in the picosecond regime with high repetition rate. Moreover, our work explores the formation of optical wave breaking using a higher energy pulse which enables the generation of a coherent octave spanning spectrum. These results offer a new prospect for coherent broadening using long duration pulses and replacing bulky optical components.

  • 7.
    Twayana, Krishna
    et al.
    Chalmers University of Technology, Sweden.
    Lei, Fuchuan
    Chalmers University of Technology, Sweden.
    Ye, Zhichao
    Chalmers University of Technology, Sweden.
    Rebolledo-Salgado, Israel
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Helgason, Öskar B
    Chalmers University of Technology, Sweden.
    Karlsson, Magnus
    Chalmers University of Technology, Sweden.
    Torres-Company, Victor
    Chalmers University of Technology, Sweden.
    Differential phase reconstruction of microcombs2022In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 47, no 13, p. 3351-3354Article in journal (Refereed)
    Abstract [en]

    Measuring microcombs in amplitude and phase provides unique insight into the nonlinear cavity dynamics, but spectral phase measurements are experimentally challenging. Here, we report a linear heterodyne technique assisted by electro-optic downconversion that enables differential phase measurement of such spectra with unprecedented sensitivity (−50 dBm) and bandwidth coverage (>110 nm in the telecommunications range). We validate the technique with a series of measurements, including single-cavity and photonic molecule microcombs. © 2022 Optica Publishing Group

  • 8.
    Twayana, Krishna
    et al.
    Chalmers University of Technology, Sweden.
    Rebolledo-Salgado, Israel
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Deriushkina, Ekaterina
    Chalmers University of Technology, Sweden.
    Schröder, Jochen
    Chalmers University of Technology, Sweden.
    Karlsson, Magnus
    Chalmers University of Technology, Sweden.
    Torres-Company, Victor
    Chalmers University of Technology, Sweden.
    Spectral Interferometry with Frequency Combs2022In: Micromachines, E-ISSN 2072-666X, Vol. 13, no 4, article id 614Article in journal (Refereed)
    Abstract [en]

    In this review paper, we provide an overview of the state of the art in linear interferometric techniques using laser frequency comb sources. Diverse techniques including Fourier transform spec-troscopy, linear spectral interferometry and swept-wavelength interferometry are covered in detail. The unique features brought by laser frequency comb sources are shown, and specific applications highlighted in molecular spectroscopy, optical coherence tomography and the characterization of photonic integrated devices and components. Finally, the possibilities enabled by advances in chip scale swept sources and frequency combs are discussed. © 2022 by the authors. 

  • 9.
    Twayana, Krishna
    et al.
    Chalmers University of Technology, Sweden.
    Rebolledo-Salgado, Israel
    RISE Research Institutes of Sweden, Safety and Transport, Measurement Technology. Chalmers University of Technology, Sweden.
    Girardi, Marcello
    Chalmers University of Technology, Sweden.
    Lei, Fuchuan
    Chalmers University of Technology, Sweden.
    Helgason, Óskar B.
    Chalmers University of Technology, Sweden.
    Karlsson, Magnus
    Chalmers University of Technology, Sweden.
    Torres-Company, Victor
    Chalmers University of Technology, Sweden.
    Multi-heterodyne Differential Phase Measurement of Microcombs2023In: 2023 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2023, Institute of Electrical and Electronics Engineers Inc. , 2023Conference paper (Other academic)
    Abstract [en]

    Microcombs have been an intense area of research in frequency synthesis and metrology over the past decade. The measurement of amplitude and phase of microcombs provides unique insight into the nonlinear cavity dynamics. Different techniques have been reported to this aim, including iterative pulse shaping [1], dual-comb interferometry [2] and lately stepped-laser interferometry [3], resulting in unprecedented sensitivity and bandwidth. Here, we report a dramatic simplification of the latter setup by using another microcomb instead of a stepped tunable laser. This results into the acquisition of complex spectra in a single-scan without requiring additional optical components and high-end detection units.

1 - 9 of 9
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  • ieee
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  • en-US
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  • nn-NO
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