Modulation instability induced by periodic power variation in soliton fiber ring lasers

Abstract

Modulation instability with subsideband generation induced by periodic power variation in soliton fiber ring lasers is reported. We found that different wavelength shifts of subsideband generation are related to different periodic power variation. The period of power variation and wavelength shifts of subsideband can be changed by altering the linear cavity phase delay. It is also found that the periodic power variation is caused by the interaction between the nonuniform polarization state of the circulating light and the polarizer in the laser cavity. PACS

Cross-Phase Modulation Instability in Mode-Locked Laser Based on Reduced Graphene Oxide

“…The nonlinearity is enhanced by the reGO flakes deposited on the 8 mm taper waist. The threshold is decreased by the periodic dispersion and loss variations experienced by pulses circulating in the cavity [15][16][17]. The corresponding optical spectrum for ML under XPMI shown in Fig.…”

“…To decrease the MI threshold, researchers have focused on MI in fibers with periodical variations of dispersion or nonlinearity [11][12][13][14], and MI in fiber resonators, where parametric gain is increased due to accumulated nonlinearity experienced by pulses circulating in laser cavity [15][16][17]. Haelterman et al show that MI could occur in a fiber ring resonator with normal dispersion, where the phase matching was obtained by the coupling between two polarization components [15].…”

“…Tang et al reported new spectral components in passively mode-locked fiber laser (ML), where high pump power leads to unstable dispersive waves [16]. Luo et al observed MI with subsidebands induced by periodic power variation [17]. In order to decrease the threshold of MI, we enhance the nonlinearity in a fiber laser cavity via long evanescent-field interaction length and strong mode confinement.…”

Switchable dual‐wavelength passively Q‐switched erbium‐doped fiber ring laser using nonlinear polarization rotation technique

“…As we know, the nonlinear polarization rotation (NPR) technique acting as an artificial saturable absorber is used extensively to achieve Q‐switched [8] and mode‐locked [9–12] pulses in fiber lasers. Optical components in the laser cavity go through the intensity dependent loss caused by the polarizer combining with the linear and nonlinear phase shift of orthogonally polarized modes.…”

Modulation instability induced by cross-phase modulation in a dual-wavelength dispersion-managed soliton fiber ring laser

“…The spectral effects caused by MI in the soliton fiber ring lasers have been reported elsewhere, which were characterized by subsideband generation. It was shown that MI with subsideband generation in the fiber ring lasers could be caused by the periodic dispersion variation [21] and periodic power fluctuation [22]. The MI discussed above occurs in the fiber lasers with only single wavelength operation.…”