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Timestamp: 2019-04-23 06:57:52+00:00

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We predict the existence of a novel type of the flat-top dissipative solitonic pulses, “platicons”, in microresonators with normal group velocity dispersion (GVD). We propose methods to generate these platicons from cw pump. Their duration may be altered significantly by tuning the pump frequency. The transformation of a discrete energy spectrum of dark solitons of the Lugiato-Lefever equation into a quasicontinuous spectrum of platicons is demonstrated. Generation of similar structures is also possible with bi-harmonic, phase/amplitude modulated pump or via laser injection locking.
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Fig. 1 Intracavity average intensity U vs. detuning ζ0 in normal GVD microresonators. Left: Same input power, different perturbations for 2Δ/κ = 0 (no comb) and 2Δ/κ = 4,10. Pin = 50mW. Right: 2Δ/κ = 8, Pin = 25, 50 and 100 mW.
Fig. 2 (Left: a, c, e) Numerically simulated shapes of optical platicons in normal GVD mi-croresonators for different values of laser detunings. (Right: b, d, f) Corresponding optical spectra for the same set of parameters (2Δ/κ = 4, Pin = 50mW).
Fig. 3 (Left) Numerical investigation of pulse formation in normal GVD microresonators. Color coded ratio of peak to average intensity in resonator, used as an indication of pulses, is mapped for different eigenmodes μs with eigenfrequencies shifted by Δ. Central bright straight vertical line corresponds to μs = 0 with platicons analyzed in this paper. Right: Existence (blue) and soft excitation (yellow) domains of platicons.
Fig. 4 Transition of discrete spectrum of dark solitons into continuous platicons upon increased perturbation Δ of the pumped mode frequency at Pin = 50 mW (left). Several higher order dark dissipative solitons (right).
Fig. 5 Families of platicons for different pump power (a,b). Families of platicons for different dispersion (c,d). In all cases 2Δ/κ = 2.
Fig. 6 Comparison of average pulse intensity for the same absolute values of normal (2Δ/κ = 2, Pin = 12.5mW) and anomalous GVD combs. Insets show corresponding comb spectra.

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