Zero-dispersion Kerr solitons in optical microresonators

Anderson, Miles; Lihachev, Grigory; Weng, Wenle; Kippenberg, Tobias J.

doi:10.48550/arxiv.2007.14507

Cited by 7 publications

(20 citation statements)

References 56 publications

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“…High-order dispersion can also be added to the model. Similar domain-wall-like behavior of the pulse has also been shown in the numerical simulations [33] .…”

supporting

confidence: 84%

Self-regulating soliton domain walls in microresonators

Wang¹,

Wu²,

Bao³

et al. 2021

Preprint

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Dissipative soliton Kerr frequency combs in microresonators have recently been demonstrated with self-injection locking. They have the advantage of turnkey deterministic comb generation, and also simplify dark soliton generation in the normal dispersion regime. Here, the formation process of dark solitons triggered by self-injection locking is studied by regarding them as a pair of domain walls that connect domains having different intracavity powers. The self-injection locking mechanism allows the domain walls to self-regulate position so that a wide range of dark soliton states can be accessed. Moreover, soliton duty cycle is readily controlled by the feedback phase. Direct imaging of the dark soliton pulse shape using the electro-optic sampling technique is used to verify the theory. The results provide new physical insights as well as a new operational modality for this important class of nonlinear waves.

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“…High-order dispersion can also be added to the model. Similar domain-wall-like behavior of the pulse has also been shown in the numerical simulations [33] .…”

supporting

confidence: 84%

Self-regulating soliton domain walls in microresonators

Wang¹,

Wu²,

Bao³

et al. 2021

Preprint

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“…We show that, by controlling the desynchronization between the repetition rate of the pulsed driving field and the cavity free-spectral-range (FSR), it is possible to control the spectral positions of the two DWs, providing a simple mechanism to tune the spectral extent of the comb. The dynamics we present here are to be contrasted with the recent experimental report of pulse-driven Kerr combs generated in a weakly-normal cavity with significant third-order dispersion [11]. In particular, in the near-zero-dispersion regime of Ref.…”

mentioning

confidence: 56%

“…The most well-known of these structures is the dissipative Kerr cavity soliton (CS) whose existence typically requires a cavity with anomalous dispersion [8,9]. Whilst recent works have shown that the inclusion of higher-order dispersion can also permit the experimental realization of CSs under conditions of weak normal dispersion [10,11], a strong normal dispersion is generally considered prohibitive for CS formation.…”

mentioning

confidence: 99%

“…Coherent Kerr combs can nonetheless arise in a normally dispersive resonator through interlocking of switching waves (SWs) [11][12][13][14][15]. Such SWs correspond to localized connections between the upper and lower branches of the bistable cavity response and have been shown to enable whole families of temporal structures -both bright and dark -in the normal dispersion regime [14,15].…”

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confidence: 99%

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Frequency comb generation in a pulse-pumped normal dispersion Kerr mini-resonator

Sharples

Fatome

et al. 2021

Opt. Lett.

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Kerr microresonators driven in the normal dispersion regime typically require the presence of localized dispersion perturbations, such as those induced by avoided mode crossings, to initiate the formation of optical frequency combs. In this work, we experimentally demonstrate that this requirement can be lifted by driving the resonator with a pulsed pump source. We also show that controlling the desynchronization between the pump repetition rate and the cavity free-spectral range (FSR) provides a simple mechanism to tune the center frequency of the output comb. Using a fiber miniresonator with a radius of only 6 cm we experimentally present spectrally flat combs with a bandwidth of 3 THz whose center frequency can be tuned by more than 2 THz. By driving the cavity at harmonics of its 0.54 GHz FSR, we are able to generate combs with line spacings selectable between 0.54 and 10.8 GHz. The ability to tune both the center frequency and frequency spacing of the output comb highlights the flexibility of this platform. Additionally, we demonstrate that under conditions of large pump-cavity desynchronization, the same cavity also supports a new form of Raman-assisted anomalous dispersion cavity soliton.

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“…More recently, there has however been growing interest in exploring the dynamics of CSs under conditions of near-zero-dispersion driving, i.e., with the wavelength of the input laser coincident (or close to coincident) with the zero-dispersion point of the resonator. In this regime, higher-order dispersion dominates the dynamics, giving rise to novel bright localized structures both in the normal and anomalous dispersion regimes [33][34][35]. Theoretical studies have also suggested that near-zero-dispersion conditions can significantly affect the solitons' instability dynamics and range of existence [36,37].…”

Section: Introductionmentioning

confidence: 99%

Observations of Existence and Instability Dynamics of Near-Zero-Dispersion Temporal Kerr Cavity Solitons

Li¹,

Xu²,

Todd³

et al. 2021

Preprint

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Dissipative Kerr cavity solitons (CSs) are persisting pulses of light that manifest themselves in driven optical resonators and that have attracted significant attention over the last decade. Whilst the vast majority of studies have revolved around conditions where the resonator exhibits strong anomalous dispersion, recent studies have shown that solitons with unique characteristics and dynamics can arise under conditions of near-zero-dispersion driving. Here we report on experimental studies of the existence and stability dynamics of Kerr CSs under such conditions. In particular, we experimentally probe the solitons' range of existence and examine how their breathing instabilities are modified when group-velocity dispersion is close to zero, such that higher-order dispersion terms play a significant role. On the one hand, our experiments directly confirm earlier theoretical works that predict (i) breathing near-zero-dispersion solitons to emit polychromatic dispersive radiation, and (ii) that higher-order dispersion can extend the range over which the solitons are stable. On the other hand, our experiments also reveal a novel cross-over scenario, whereby the influence of higherorder dispersion changes from stabilising to destabilising. Our comprehensive experiments sample soliton dynamics both in the normal and anomalous dispersion regimes, and our results are in good agreement with numerical simulations and theoretical predictions.

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Zero-dispersion Kerr solitons in optical microresonators

Cited by 7 publications

References 56 publications

Self-regulating soliton domain walls in microresonators

Self-regulating soliton domain walls in microresonators

Frequency comb generation in a pulse-pumped normal dispersion Kerr mini-resonator

Observations of Existence and Instability Dynamics of Near-Zero-Dispersion Temporal Kerr Cavity Solitons

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