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Wang W, Lu PK, Vinod AK, Turan D, McMillan JF, Liu H, Yu M, Kwong DL, Jarrahi M, Wong CW. Coherent terahertz radiation with 2.8-octave tunability through chip-scale photomixed microresonator optical parametric oscillation. Nat Commun 2022; 13:5123. [PMID: 36045124 PMCID: PMC9433451 DOI: 10.1038/s41467-022-32739-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2021] [Accepted: 08/12/2022] [Indexed: 12/03/2022] Open
Abstract
High-spectral-purity frequency-agile room-temperature sources in the terahertz spectrum are foundational elements for imaging, sensing, metrology, and communications. Here we present a chip-scale optical parametric oscillator based on an integrated nonlinear microresonator that provides broadly tunable single-frequency and multi-frequency oscillators in the terahertz regime. Through optical-to-terahertz down-conversion using a plasmonic nanoantenna array, coherent terahertz radiation spanning 2.8-octaves is achieved from 330 GHz to 2.3 THz, with ≈20 GHz cavity-mode-limited frequency tuning step and ≈10 MHz intracavity-mode continuous frequency tuning range at each step. By controlling the microresonator intracavity power and pump-resonance detuning, tunable multi-frequency terahertz oscillators are also realized. Furthermore, by stabilizing the microresonator pump power and wavelength, sub-100 Hz linewidth of the terahertz radiation with 10−15 residual frequency instability is demonstrated. The room-temperature generation of both single-frequency, frequency-agile terahertz radiation and multi-frequency terahertz oscillators in the chip-scale platform offers unique capabilities in metrology, sensing, imaging and communications. High-spectral-purity frequency-agile room-temperature THz sources are foundational elements for imaging, sensing, metrology, and communications. Here a parametric oscillator-photomixer chip with coherent 2.8-octave tunable THz radiation is achieved.
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Affiliation(s)
- Wenting Wang
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA.
| | - Ping-Keng Lu
- Terahertz Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA
| | - Abhinav Kumar Vinod
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA
| | - Deniz Turan
- Terahertz Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA
| | - James F McMillan
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA
| | - Hao Liu
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA
| | - Mingbin Yu
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Shanghai, China.,Institute of Microelectronics, A*STAR, Singapore, 117865, Singapore
| | - Dim-Lee Kwong
- Institute of Microelectronics, A*STAR, Singapore, 117865, Singapore
| | - Mona Jarrahi
- Terahertz Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA.
| | - Chee Wei Wong
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA, 90095, USA.
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2
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Tikan A, Tusnin A, Riemensberger J, Churaev M, Ji X, Komagata KN, Wang RN, Liu J, Kippenberg TJ. Protected generation of dissipative Kerr solitons in supermodes of coupled optical microresonators. SCIENCE ADVANCES 2022; 8:eabm6982. [PMID: 35363514 PMCID: PMC10938571 DOI: 10.1126/sciadv.abm6982] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 02/11/2022] [Indexed: 06/14/2023]
Abstract
A photonic dimer composed of two evanescently coupled high-Q microresonators is a fundamental element of multimode soliton lattices. It has demonstrated a variety of emergent nonlinear phenomena, including supermode soliton generation and soliton hopping. Here, we present another aspect of dissipative soliton generation in coupled resonators, revealing the advantages of this system over conventional single-resonator platforms. Namely, we show that the accessibility of solitons markedly varies for symmetric and antisymmetric supermode families. Linear measurements reveal that the coupling between transverse modes, giving rise to avoided mode crossings, can be substantially suppressed. We explain the origin of this phenomenon and show its influence on the dissipative Kerr soliton generation in lattices of coupled resonators of any type. Choosing an example of the topological Su-Schrieffer-Heeger model, we demonstrate how the edge state can be protected from the interaction with higher-order modes, allowing for the formation of topological Kerr solitons.
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Affiliation(s)
- Alexey Tikan
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Aleksandr Tusnin
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Johann Riemensberger
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Mikhail Churaev
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Xinru Ji
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | | | - Rui Ning Wang
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Junqiu Liu
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Tobias J. Kippenberg
- Institute of Physics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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3
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Kim C, Yvind K, Pu M. Suppression of avoided resonance crossing in microresonators. OPTICS LETTERS 2021; 46:3508-3511. [PMID: 34329211 DOI: 10.1364/ol.431667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 06/19/2021] [Indexed: 06/13/2023]
Abstract
Kerr frequency comb generation in microresonators is enabled by notable developments in fabrication technology and novel nonlinear material platforms. However, even in a low loss and highly nonlinear microresonator, the avoided resonance crossing may hamper reliable frequency comb generation. We present a method to suppress the avoided resonance crossing induced by polarization mode coupling. Our approach employs a filter waveguide coupled to a microring resonator for selective filtering of the TM00 mode while keeping the operational TE00 mode with low loss. We experimentally demonstrate an avoided-crossing-suppressed microresonator in the AlGaAs-on-insulator platform.
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Geng Y, Cui W, Sun J, Chen X, Yin X, Deng G, Zhou Q, Zhou H. Enhancing the long-term stability of dissipative Kerr soliton microcomb. OPTICS LETTERS 2020; 45:5073-5076. [PMID: 32932456 DOI: 10.1364/ol.400656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 08/07/2020] [Indexed: 06/11/2023]
Abstract
A temporal dissipative Kerr soliton (DKS) frequency comb can be generated in an optical micro-cavity relying on the rigid balance between cavity decay (dispersion) and parametric gain (nonlinear phase modulation) induced by an intense pump laser. In practice, to maintain such delicate double balances experienced by the intracavity soliton pulses, it requires precise control of the pump laser frequency and power, as well as the micro-cavity parameters. However, to date there still lacks experimental demonstration that simultaneously stabilizes all these key parameters to enhance the long-term DKS stability. Here, we demonstrate continuous working of a on-chip DKS microcomb for a record-breaking 14 days without showing any sign of breakdown. Such improved microcomb stability is enabled mainly by robust pump power coupling to the micro-cavity utilizing packaged planar-lightwave-circuit mode converters, and faithful locking of the pump frequency detuning via an auxiliary laser heating method. In addition to superior stability, the demonstrated DKS microcomb system also achieves favorable compactness, with all the accessory modules being assembled into a standard 4U case. We hope that our demonstration could prompt the practical utilization of Kerr microcombs in real-world applications.
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Li Y, Huang SW, Li B, Liu H, Yang J, Vinod AK, Wang K, Yu M, Kwong DL, Wang HT, Wong KKY, Wong CW. Real-time transition dynamics and stability of chip-scale dispersion-managed frequency microcombs. LIGHT, SCIENCE & APPLICATIONS 2020; 9:52. [PMID: 32284854 PMCID: PMC7118405 DOI: 10.1038/s41377-020-0290-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 02/14/2020] [Accepted: 03/14/2020] [Indexed: 05/23/2023]
Abstract
Femtosecond mode-locked laser frequency combs have served as the cornerstone in precision spectroscopy, all-optical atomic clocks, and measurements of ultrafast dynamics. Recently frequency microcombs based on nonlinear microresonators have been examined, exhibiting remarkable precision approaching that of laser frequency combs, on a solid-state chip-scale platform and from a fundamentally different physical origin. Despite recent successes, to date, the real-time dynamical origins and high-power stabilities of such frequency microcombs have not been fully addressed. Here, we unravel the transitional dynamics of frequency microcombs from chaotic background routes to femtosecond mode-locking in real time, enabled by our ultrafast temporal magnifier metrology and improved stability of dispersion-managed dissipative solitons. Through our dispersion-managed oscillator, we further report a stability zone that is more than an order-of-magnitude larger than its prior static homogeneous counterparts, providing a novel platform for understanding ultrafast dissipative dynamics and offering a new path towards high-power frequency microcombs.
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Affiliation(s)
- Yongnan Li
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
- School of Physics and The MOE Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin, China
| | - Shu-Wei Huang
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
- Department of Electrical, Computer and Energy Engineering, University of Colorado Boulder, Boulder, CO 80309 USA
| | - Bowen Li
- Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China
| | - Hao Liu
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
| | - Jinghui Yang
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
| | - Abhinav Kumar Vinod
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
| | - Ke Wang
- School of Physics and The MOE Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin, China
| | - Mingbin Yu
- Institute of Microelectronics, A*STAR, Singapore, 117865 Singapore
| | - Dim-Lee Kwong
- Institute of Microelectronics, A*STAR, Singapore, 117865 Singapore
| | - Hui-Tian Wang
- School of Physics and The MOE Key Laboratory of Weak Light Nonlinear Photonics, Nankai University, Tianjin, China
| | - Kenneth Kin-Yip Wong
- Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China
| | - Chee Wei Wong
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
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6
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Zhou H, Geng Y, Cui W, Huang SW, Zhou Q, Qiu K, Wei Wong C. Soliton bursts and deterministic dissipative Kerr soliton generation in auxiliary-assisted microcavities. LIGHT, SCIENCE & APPLICATIONS 2019; 8:50. [PMID: 31149335 PMCID: PMC6538660 DOI: 10.1038/s41377-019-0161-y] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 05/10/2019] [Accepted: 05/14/2019] [Indexed: 05/14/2023]
Abstract
Dissipative Kerr solitons in resonant frequency combs offer a promising route for ultrafast mode-locking, precision spectroscopy and time-frequency standards. The dynamics for the dissipative soliton generation, however, are intrinsically intertwined with thermal nonlinearities, limiting the soliton generation parameter map and statistical success probabilities of the solitary state. Here, via use of an auxiliary laser heating approach to suppress thermal dragging dynamics in dissipative soliton comb formation, we demonstrate stable Kerr soliton singlet formation and soliton bursts. First, we access a new soliton existence range with an inverse-sloped Kerr soliton evolution-diminishing soliton energy with increasing pump detuning. Second, we achieve deterministic transitions from Turing-like comb patterns directly into the dissipative Kerr soliton singlet pulse bypassing the chaotic states. This is achieved by avoiding subcomb overlaps at lower pump power, with near-identical singlet soliton comb generation over twenty instances. Third, with the red-detuned pump entrance route enabled, we uncover unique spontaneous soliton bursts in the direct formation of low-noise optical frequency combs from continuum background noise. The burst dynamics are due to the rapid entry and mutual attraction of the pump laser into the cavity mode, aided by the auxiliary laser and matching well with our numerical simulations. Enabled by the auxiliary-assisted frequency comb dynamics, we demonstrate an application of automatic soliton comb recovery and long-term stabilization against strong external perturbations. Our findings hold potential to expand the parameter space for ultrafast nonlinear dynamics and precision optical frequency comb stabilization.
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Affiliation(s)
- Heng Zhou
- Key Lab of Optical Fiber Sensing and Communication Networks, University of Electronic Science and Technology of China, 611731 Chengdu, China
| | - Yong Geng
- Key Lab of Optical Fiber Sensing and Communication Networks, University of Electronic Science and Technology of China, 611731 Chengdu, China
| | - Wenwen Cui
- Key Lab of Optical Fiber Sensing and Communication Networks, University of Electronic Science and Technology of China, 611731 Chengdu, China
| | - Shu-Wei Huang
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
- Department of Electrical, Computer, and Energy Engineering, University of Colorado, Boulder, CO 80309 USA
| | - Qiang Zhou
- Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, 611731 Chengdu, China
| | - Kun Qiu
- Key Lab of Optical Fiber Sensing and Communication Networks, University of Electronic Science and Technology of China, 611731 Chengdu, China
| | - Chee Wei Wong
- Fang Lu Mesoscopic Optics and Quantum Electronics Laboratory, University of California, Los Angeles, CA 90095 USA
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7
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Xue X, Zheng X, Weiner AM. Soliton trapping and comb self-referencing in a single microresonator with χ (2) and χ (3) nonlinearities. OPTICS LETTERS 2017; 42:4147-4150. [PMID: 29028034 DOI: 10.1364/ol.42.004147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Accepted: 09/14/2017] [Indexed: 06/07/2023]
Abstract
A shaped doublet pump pulse is proposed for a simultaneous octave-spanning soliton Kerr frequency comb generation and second-harmonic conversion in a single microresonator. The temporal soliton in the cavity is trapped atop a doublet-pulse pedestal, resulting in a greatly expanded soliton region compared to that with a general Gaussian pulse pump. The possibility of single-microresonator comb self-referencing in a single silicon nitride microring that can facilitate compact on-chip optical clocks is demonstrated via simulation.
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8
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Kim S, Han K, Wang C, Jaramillo-Villegas JA, Xue X, Bao C, Xuan Y, Leaird DE, Weiner AM, Qi M. Dispersion engineering and frequency comb generation in thin silicon nitride concentric microresonators. Nat Commun 2017; 8:372. [PMID: 28851874 PMCID: PMC5575100 DOI: 10.1038/s41467-017-00491-x] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 07/02/2017] [Indexed: 11/27/2022] Open
Abstract
Kerr nonlinearity-based frequency combs and solitons have been generated from on-chip microresonators. The initiation of the combs requires global or local anomalous dispersion which leads to many limitations, such as material choice, film thickness, and spectral ranges where combs can be generated, as well as fabrication challenges. Using a concentric racetrack-shaped resonator, we show that such constraints can be lifted and resonator dispersion can be engineered to be anomalous over moderately broad bandwidth. We demonstrate anomalous dispersion in a 300 nm thick silicon nitride film, suitable for semiconductor manufacturing but previously thought to result in waveguides with high normal dispersion. Together with a mode-selective, tapered coupling scheme, we generate coherent mode-locked frequency combs. Our method can realize anomalous dispersion for resonators at almost any wavelength and simultaneously achieve material and process compatibility with semiconductor manufacturing.Kerr frequency comb generation from microresonators requires anomalous dispersion, imposing restrictions on materials and resonator design. Here, Kim et al. propose a concentric racetrack-resonator design where the dispersion can be engineered to be anomalous via resonant mode coupling.
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Affiliation(s)
- Sangsik Kim
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- Purdue Quantum Center, Purdue University, West Lafayette, IN, 47907, USA
- Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, TX, 79409, USA
| | - Kyunghun Han
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Cong Wang
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Jose A Jaramillo-Villegas
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Purdue Quantum Center, Purdue University, West Lafayette, IN, 47907, USA
- Facultad de Ingenierías, Universidad Tecnológica de Pereira, Pereira, RIS, 660003, Colombia
| | - Xiaoxiao Xue
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China
| | - Chengying Bao
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Yi Xuan
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Daniel E Leaird
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Andrew M Weiner
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
- Purdue Quantum Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Minghao Qi
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN, 47907, USA.
- Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA.
- Purdue Quantum Center, Purdue University, West Lafayette, IN, 47907, USA.
- Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, 200050, China.
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Huang SW, Vinod AK, Yang J, Yu M, Kwong DL, Wong CW. Quasi-phase-matched multispectral Kerr frequency comb. OPTICS LETTERS 2017; 42:2110-2113. [PMID: 28569858 DOI: 10.1364/ol.42.002110] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 04/25/2017] [Indexed: 06/07/2023]
Abstract
We study a new type of Kerr frequency comb where the momentum conservation law is fulfilled by azimuthal modulation of the waveguide dispersion. The concept can expand the parametric range in which a Kerr frequency comb is obtained. In a good agreement with the theoretical analysis, we demonstrate a multispectral Kerr frequency comb covering important fiber-optic communication bands. Comb coherence and absence of a sub-comb offset are confirmed by continuous-wave heterodyne beat note and amplitude noise spectra measurements. The device can be used for achieving broadband optical frequency synthesizers and high-capacity coherent communication.
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Yi X, Yang QF, Zhang X, Yang KY, Li X, Vahala K. Single-mode dispersive waves and soliton microcomb dynamics. Nat Commun 2017; 8:14869. [PMID: 28332495 PMCID: PMC5376647 DOI: 10.1038/ncomms14869] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 02/06/2017] [Indexed: 11/15/2022] Open
Abstract
Dissipative Kerr solitons are self-sustaining optical wavepackets in resonators. They use the Kerr nonlinearity to both compensate dispersion and offset optical loss. Besides providing insights into nonlinear resonator physics, they can be applied in frequency metrology, precision clocks, and spectroscopy. Like other optical solitons, the dissipative Kerr soliton can radiate power as a dispersive wave through a process that is the optical analogue of Cherenkov radiation. Dispersive waves typically consist of an ensemble of optical modes. Here, a limiting case is studied in which the dispersive wave is concentrated into a single cavity mode. In this limit, its interaction with the soliton induces hysteresis behaviour in the soliton's spectral and temporal properties. Also, an operating point of enhanced repetition-rate stability occurs through balance of dispersive-wave recoil and Raman-induced soliton-self-frequency shift. The single-mode dispersive wave can therefore provide quiet states of soliton comb operation useful in many applications.
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Affiliation(s)
- Xu Yi
- T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA
| | - Qi-Fan Yang
- T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA
| | - Xueyue Zhang
- T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA
- Department of Microelectronics and Nanoelectronics, Tsinghua University, Beijing 100084, China
| | - Ki Youl Yang
- T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA
| | - Xinbai Li
- T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA
- State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China
| | - Kerry Vahala
- T.J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, USA
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Liao P, Bao C, Kordts A, Karpov M, Pfeiffer MHP, Zhang L, Mohajerin-Ariaei A, Cao Y, Almaiman A, Ziyadi M, Wilkinson SR, Tur M, Kippenberg TJ, Willner AE. Dependence of a microresonator Kerr frequency comb on the pump linewidth. OPTICS LETTERS 2017; 42:779-782. [PMID: 28198861 DOI: 10.1364/ol.42.000779] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We experimentally investigate the dependence of Kerr comb generation, comb linewidth, and coherent system performance on the pump linewidth in a microresonator. We find that the generation of the primary comb can have a larger tolerance to the pump linewidth compared with that of the low-phase-noise comb. In addition, the linewidths of the generated combs are almost linearly dependent on the pump linewidth in the primary and low-phase-noise states. Furthermore, the optical signal-to-noise ratio penalty between the pump and generated Kerr combs in a coherent communication system is less than 0.2 dB in both the primary and low-phase-noise states, showing that Kerr frequency combs in these two states can have similar coherent system performance to the pump.
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12
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Webb KE, Erkintalo M, Coen S, Murdoch SG. Experimental observation of coherent cavity soliton frequency combs in silica microspheres. OPTICS LETTERS 2016; 41:4613-4616. [PMID: 28005849 DOI: 10.1364/ol.41.004613] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We report on the experimental observation of coherent cavity soliton frequency combs in silica microspheres. Specifically, we demonstrate that careful alignment of the microsphere relative to the coupling fiber taper allows for the suppression of higher-order spatial modes, reducing mode interactions and enabling soliton formation. Our measurements show that the temporal cavity solitons have sub-100-fs durations, exhibit considerable Raman self-frequency shift, and generally come in groups of three or four, occasionally with equidistant spacing in the time domain. RF amplitude noise measurements and spectral interferometry confirm the high coherence of the observed soliton frequency combs, and numerical simulations show good agreement with experiments.
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