Bistable lasing in parity-time symmetric coupled fiber rings

Smirnov, S. V.; Makarenko, Maxim O.; Suchkov, Sergey; Churkin, Dmitry V.; Sukhorukov, Andrey A.

doi:10.1364/prj.6.000a18

Cited by 12 publications

(13 citation statements)

References 21 publications

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“…is PT invariant for g 1 + g 2 = 0, as was shown in [25], however, the form Eq. ( 1) is more convenient for analysis.…”

Section: Nonlinear Pt-symmetric Fiber Loop Lasermentioning

confidence: 80%

“…In addition, the cavities are cross-coupled, which facilitates the PT-symmetry of the system. In this work, we systematically investigate the effect of power-dependent nonlinear phase shift and identify distinct phenomena compared to the previously analyzed linear phase shifters [25]. A signal round trip can be described by matrix operator L, where each sub-matrix corresponds to a couple of controlling elements placed in both loops of the laser setup a shown in Fig.…”

Section: Nonlinear Pt-symmetric Fiber Loop Lasermentioning

confidence: 99%

“…It was predicted that PT-symmetric coupled fiber-loop lasers can exhibit bi-stable dynamics combined with a lower lasing power threshold [25]. In this work, we study the effect of nonlinear phase modulation on the dynamics of the PT-symmetric coupled fiber-loop laser and identify the transition dynamics between the PT-symmetric and broken phases.…”

Section: Introductionmentioning

confidence: 98%

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Nonlinear transition between PT-symmetric and PT-broken modes in coupled fiber lasers

Suchkov¹,

Churkin²,

Sukhorukov³

2020

Opt. Express

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We present a systematic analysis of the stationary regimes of nonlinear parity-time (PT) symmetric laser composed of two coupled fiber cavities. We find that power-dependent nonlinear phase shifters broaden regions of existence of both PT-symmetric and PT-broken modes, and can facilitate transitions between modes of different types. We show the existence of non-stationary regimes and demonstrate an ambiguity of the transition process for some of the unstable states. We also identify the presence of higher-order stationary modes, which return to the initial state periodically after a certain number of round-trips.

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“…is PT invariant for g 1 + g 2 = 0, as was shown in [25], however, the form Eq. ( 1) is more convenient for analysis.…”

Section: Nonlinear Pt-symmetric Fiber Loop Lasermentioning

confidence: 80%

Section: Nonlinear Pt-symmetric Fiber Loop Lasermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Nonlinear transition between PT-symmetric and PT-broken modes in coupled fiber lasers

Suchkov¹,

Churkin²,

Sukhorukov³

2020

Opt. Express

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“…Our results represent the first realization of non-Hermitian physics, including phase transition and EP singularity, in a single strand of standard optical fibre. Optoelectronic systems employing fibre loops to demonstrate PT-symmetry in coupled fibre ring lasers 50 , optoelectronic oscillators 51,52 and synthetic dimensions 6,53 can be found in the recent literature. However, they share many of the characteristics of PT-symmetry and EP studies in integrated devices: their degrees of freedom are optical fields circulating in resonator paths, and precise tuning of resonance frequencies is required.…”

Section: Discussionmentioning

confidence: 99%

Observation of anti-parity-time-symmetry, phase transitions and exceptional points in an optical fibre

et al. 2021

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The exotic physics emerging in non-Hermitian systems with balanced distributions of gain and loss has recently drawn a great deal of attention. These systems exhibit phase transitions and exceptional point singularities in their spectra, at which eigen-values and eigen-modes coalesce and the overall dimensionality is reduced. So far, these principles have been implemented at the expense of precise fabrication and tuning requirements, involving tailored nano-structured devices with controlled optical gain and loss. In this work, anti-parity-time symmetric phase transitions and exceptional point singularities are demonstrated in a single strand of single-mode telecommunication fibre, using a setup consisting of off-the-shelf components. Two propagating signals are amplified and coupled through stimulated Brillouin scattering, enabling exquisite control over the interaction-governing non-Hermitian parameters. Singular response to small-scale variations and topological features arising around the exceptional point are experimentally demonstrated with large precision, enabling robustly enhanced response to changes in Brillouin frequency shift.

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“…Previous experiments demonstrated single-mode lasing or anti-lasing [27,28], bistable lasing [29], loss-induced transparency or lasing [9,30], EP-enhanced sensing [31][32][33], and PT symmetry breaking [21,22,30,34,35]. Moreover, recent experiments have observed: information flow in PTsymmetric systems [23], protection of quantum coherence in a PT -broken superconducting circuit [36], EP-enhanced coherence and oscillation of coherence in a single ion PTsymmetry system [37], entanglement restoration in a PTsymmetric system using a universal circuit [38], and dynamical features of a triple-qubit system in which one qubit evolves under a local PT -symmetric Hamiltonian [39].…”

Section: Introductionmentioning

confidence: 99%

Experimental demonstration of coherence flow in $\mathcal{PT}$- and anti-$\mathcal{PT}$-symmetric systems

Fang,

Zhao,

Zhang

et al. 2021

Preprint

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Non-Hermitian parity-time (PT ) and anti-parity-time (APT )-symmetric systems exhibit novel quantum properties and have attracted increasing interest. Although many counterintuitive phenomena in PT -and APT -symmetric systems were previously studied, coherence flow has been rarely investigated. Here, we experimentally demonstrate single-qubit coherence flow in PT -and APT -symmetric systems using an optical setup. In the symmetry unbroken regime, we observe different periodic oscillations of coherence. Particularly, we observe two complete coherence backflows in one period in the PT -symmetric system, while only one backflow in the APT -symmetric system. Moreover, in the symmetry broken regime, we observe the phenomenon of stable value of coherence flow. We derive the analytic proofs of these phenomena and show that most experimental data agree with theoretical results within one standard deviation. This work opens avenues for future study on the dynamics of coherence in PT -and APT -symmetric systems.

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Bistable lasing in parity-time symmetric coupled fiber rings

Cited by 12 publications

References 21 publications

Nonlinear transition between PT-symmetric and PT-broken modes in coupled fiber lasers

Nonlinear transition between PT-symmetric and PT-broken modes in coupled fiber lasers

Observation of anti-parity-time-symmetry, phase transitions and exceptional points in an optical fibre

Experimental demonstration of coherence flow in $\mathcal{PT}$- and anti-$\mathcal{PT}$-symmetric systems

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