Raman-induced noiselike pulses in a highly nonlinear and dispersive all-fiber ring laser

Abstract

Dual-wavelength noiselike pulses are generated in a fiber ring laser. A first series of pulses is induced at a wavelength of 1550 nm by the interplay of an erbium-doped fiber and nonlinear polarization rotation. From the Raman gain of these pump pulses emerges a second series of Stokes pulses at 1650 nm. With adequate control of the polarization states in the cavity, the noiselike Stokes pulses extend over 84 nm in the Ultralong-wavelengths band (U-band), while the pump pulses span over 46 nm.

High energy noise-like pulsing in a double-clad Er/Yb figure-of-eight fiber laser

“…First demonstrated by Horowitz et al [8], this particular regime of fiber lasers has been drawing attention due to its potential for generating very broad spectra covering hundreds of nanometers [9][10][11], for achieving high energy pulses [7,[12][13][14] and for applications requiring low temporal coherence [8]. NLPs are partially stationary pulses consisting of a bunch of extremely variable ultrashort sub-pulses conserving stable global properties like the total duration of the bunch, its average amplitude, energy and average spectrum.…”

“…Besides, NLPs have been observed in various spectral windows including EDF [6][7][8][9][10][11]13,16,20], YDF [21] and TDF [14,22]. Another remarkable aspect of NLPs is that they have demonstrated better efficiency than solitons in nonlinear processes such as cascaded stimulated Raman scattering [23], nonlinear frequency conversion [23,24] and supercontinuum (SC) generation [25,26], among others.…”

Modeling Frequency Comb Sources

“…By using the highly chirped dissipative solitons, mode-locked fiber lasers based on NPE and NOLM in all-normal dispersive (ANDi) single-mode fiber cavities have successfully pushed the single-pulse energy to more than 20 nJ and pulse durations less than 80 fs [33,55,59]. A further increase of the single-pulse energy in these singlemode fiber cavities is, however, impeded by practical limitations such as stimulated Raman scattering [60][61][62][63].…”

1000–1400-nm partially mode-locked pulse from a simple all-fiber cavity

“…To obtain stable mode-locking and avoid unwanted nonlinear effects for practical applications, they are typically expected to operate in the single-pulse regime with a moderate spectral width confined by the gain media [3][4][5]. At the other extreme, the unstable/partial mode-locking regime, characterized by a seemingly regular train of noise-like pulse (NP) with a smooth and broad averaged spectrum [6], has recently attracted particular attention [7][8][9][10][11][12]. This is inspired by its fundamental physical studies [13], particularly the possible connection with the rogue wave (RW) generation [14][15][16][17][18].…”

“…This is inspired by its fundamental physical studies [13], particularly the possible connection with the rogue wave (RW) generation [14][15][16][17][18]. NP mode-locking has been realized through dispersion management [6][7][8], cavity length elongation [9,10], and nonlinearity enhancement [11,12]. Although a longer red-shifted wavelength has been observed to facilitate the rare event generation [14], the optical spectra of prior NP mode-locking were limited by fiberbased configurations.…”