Advances in soliton microcomb generation

Wang, Weiqiang; Wang, Leiran; Zhang, Wenfu

doi:10.1117/1.ap.2.3.034001

Cited by 102 publications

(30 citation statements)

References 151 publications

(265 reference statements)

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“…Kerr frequency comb (microcomb) generation based on parametric four-wave mixing (FWM) in monolithic microresonators with high quality (Q) factors [1], emerging as an alternative scheme, has attracted considerable interest due to miniaturization, chip-scale integration, repetition rate in the microwave and terahertz regime, and spectral coverage from visible to mid-infrared [2][3][4][5]. The recent demonstration of dissipative Kerr solitons (DKSs) [6,7], with a double balance between Kerr nonlinearity and dispersion as well as loss and parametric gain in the optical resonator, has provided a route to a fully coherent microcomb with a smooth spectral envelope and broadened width due to soliton-induced Cherenkov radiation [8,9]. The soliton microcomb has ubiquitous commercial potential for applications in dual-comb spectroscopy [10], coherent communications [11], frequency synthesizer [12], long-distance measurements [13], and quantum key distribution [14].…”

Section: Introductionmentioning

confidence: 99%

Directly accessing octave-spanning dissipative Kerr soliton frequency combs in an AlN microresonator

et al. 2021

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Self-referenced dissipative Kerr solitons (DKSs) based on optical microresonators offer prominent characteristics allowing for various applications from precision measurement to astronomical spectrometer calibration. To date, direct octave-spanning DKS generation has been achieved only in ultrahigh-Q silicon nitride microresonators under optimized laser tuning speed or bi-directional tuning. Here we propose a simple method to easily access the octave-spanning DKS in an aluminum nitride (AlN) microresonator. In the design, two modes that belong to different families but with the same polarization are nearly degenerate and act as a pump and an auxiliary resonance, respectively. The presence of the auxiliary resonance can balance the thermal dragging effect, crucially simplifying the DKS generation with a single pump and leading to an enhanced soliton access window. We experimentally demonstrate the long-lived DKS operation with a record single-soliton step (10.4 GHz or 83 pm) and an octave-spanning bandwidth (1100-2300 nm) through adiabatic pump tuning. Our scheme also allows for direct creation of the DKS state with high probability and without elaborate wavelength or power schemes being required to stabilize the soliton behavior.

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Section: Introductionmentioning

confidence: 99%

Directly accessing octave-spanning dissipative Kerr soliton frequency combs in an AlN microresonator

et al. 2021

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“…A significant number of ongoing research topics, e.g., high-speed photonic analogto-digital conversion [140], dual-comb spectroscopic measurements [141][142][143][144][145][146][147], X-band ultra-low-noise microwave generation [148][149][150][151], and astro-combs [152][153][154][155], require frequency combs with large mode spacing, therefore novel optical frequency combs aim to boost the comb spacing over the GHz level. Representative techniques generating high-repetition-rate laser sources are QCL-based combs [156,157], microcombs [158][159][160], and EO-modulated combs [161,162]. The detailed study of noise behavior in these novel combs could be found in this literature [150,[162][163][164][165].…”

Section: Discussionmentioning

confidence: 99%

Noise Measurement and Reduction in Mode-Locked Lasers: Fundamentals for Low-Noise Optical Frequency Combs

Tian

Song

2021

Applied Sciences

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After five decades of development, mode-locked lasers have become significant building blocks for many optical systems in scientific research, industry, and biomedicine. Advances in noise measurement and reduction are motivated for both shedding new light on the fundamentals of realizing ultra-low-noise optical frequency combs and their extension to potential applications for standards, metrology, clock comparison, and so on. In this review, the theoretical models of noise in mode-locked lasers are first described. Then, the recent techniques for timing jitter, carrier-envelope phase noise, and comb-line noise measurement and their stabilization are summarized. Finally, the potential of the discussed technology to be fulfilled in novel optical frequency combs, such as electro-optic (EO) modulated combs, microcombs, and quantum cascade laser (QCL) combs, is envisioned.

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“…Next, we systematically studied the dispersion, Q-factors, and OPO threshold powers based on GeSbS microresonators 48 . To further ensure accurate dispersion control of the waveguide, refractive index variation during the annealing process was also considered in device design, as shown in SI Fig.…”

Section: Characterization Of High Q-factor Gesbs Microresonatorsmentioning

confidence: 99%

Soliton Microcombs in Integrated Chalcogenide Microresonators

Xia¹,

Yang²,

Zeng³

et al. 2022

Preprint

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Photonic integrated microcombs have enabled advanced applications in optical communication, microwave synthesis, and optical metrology, which in nature unveil an optical dissipative soliton pattern under cavity-enhanced nonlinear processes. The most decisive factor of microcombs lies in the photonic material platforms, where materials with high nonlinearity and in capacity of high-quality chip integration are highly demanded. In this work, we present a home-developed chalcogenide glasses-Ge25Sb10S65 (GeSbS) for the nonlinear photonic integration and for the dissipative soliton microcomb generation. Compared with the current integrated nonlinear platforms, the GeSbS features wider transparency from the visible to 11-μm region, stronger nonlinearity, and lower thermo-refractive coefficient, and is CMOS compatible in fabrication. In this platform, we achieve chip-integrated optical microresonators with a quality (Q) factor above 2×10^6, and carry out lithographically controlled dispersion engineering. In particular, we demonstrate that both a bright soliton-based microcomb and a dark-pulsed comb are generated in a single microresonator, in its separated fundamental polarized mode families under different dispersion regimes. The overall pumping power is on the ten-milliwatt level, determined by both the high Q-factor and the high material nonlinearity of the microresonator. Our results may contribute to the field of nonlinear photonics with an alternative material platform for highly compact and high-intensity nonlinear interactions, while on the application aspect, contribute to the development of soliton microcombs at low operation power, which is potentially required for monolithically integrated optical frequency combs.

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Advances in soliton microcomb generation

Cited by 102 publications

References 151 publications

Directly accessing octave-spanning dissipative Kerr soliton frequency combs in an AlN microresonator

Directly accessing octave-spanning dissipative Kerr soliton frequency combs in an AlN microresonator

Noise Measurement and Reduction in Mode-Locked Lasers: Fundamentals for Low-Noise Optical Frequency Combs

Soliton Microcombs in Integrated Chalcogenide Microresonators

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