Dissipative solitons in a passively mode-locked Er-doped fiber with strong normal dispersion

Abstract

We report on ultrashort pulse generation from a passively mode-locked erbium fiber laser operating in the highly positive dispersion regime. Highly-chirped pulses with 5.3 ps duration and spectral bandwidth of 8.3 nm are generated. They are extra-cavity compressed down to 757 fs. Numerical simulations confirm the experimental results and show that these pulses could be interpreted as dissipative solitons.

Design and Applications of In-Cavity Pulse Shaping by Spectral Sculpturing in Mode-Locked Fibre Lasers

“…The autocorrelation trace of the pulse with 0.20 mW of average power after the fibre of the laser output port indicates an FWHM pulse duration of 2.78 ps when a Gaussian fit is assumed. It is well known that DSs occur in all-normal [12,13] or strong net-normal dispersion cavities [14][15][16]. In our laser design, strong net-normal dispersion can be achieved by configuring the dispersion of the in-cavity filter; meanwhile, the filter bandwidth also needs to be properly controlled, as DSs require additional amplitude modulation besides saturable absorber action [12,18].…”

“…Nonlinear effects are usually quite large in mode-locked fibre lasers, but the interplay among the effects of gain/loss, dispersion and nonlinearity can also be used to shape the pulses, manipulate and control the light dynamics and, hence, lead to different regimes of mode locking. Five distinct nonlinear regimes of pulse generation have been demonstrated in passively-mode-locked fibre lasers, including soliton [4] and stretched-pulse [5,6] regimes, self-similar pulse (similariton) propagation in passive [7] and active [8][9][10][11] fibres and all-normal or strong net-normal dispersion regimes [12][13][14][15][16]. These mode-locking dynamics have been observed at the emission wavelengths of both ytterbium and erbium, as well as in Raman fibre oscillators and, more recently, also in thulium-doped fibre lasers [17], so they are not specific to the particular gain medium.…”

Dynamics of a Dispersion-Managed Passively Mode-Locked Er-Doped Fiber Laser Using Single Wall Carbon Nanotubes

“…The length of the NDF was 100 cm and DT was +0.08 ps 2 . In this condition, dissipative-soliton mode-locking operation was achieved, and a high-energy picosecond pulse was generated [16,[30][31][32]. The repetition rate was 27.4 MHz.…”

Ultrashort pulse formation and evolution in mode-locked fiber lasers

“…By decreasing the pump power, the optical spectrum maintains the spectral profile but the spectral bandwidth decreases. The asymmetric spectral behavior can be attributed, at first, to the finite temporal response of the SA [23] and to the Bragg reflector behind the SA and the gain dynamic and transmission properties of the fiber based cavity elements (CFBG and coupler). An additional residual low frequency intensity modulation appears in the optical spectrum, which is very different than that reported in paragraph 2 where the presence of a high frequency intensity modulation is attributed to interference effects by polarization mode mixing and intra-cavity splice issues.…”