Mamyshev oscillators (MOs) are characterized by high energy output, but the complex structure and the difficulty of the start-up have hindered their application. A temperature-boosted MO is demonstrated here, which has an extremely simple all-fiber structure with only one passive arm. The self-starting process is achieved by precisely adjusting two filters containing cascaded long-period fiber gratings (CLPFGs). The variation of the filter spacing is tuned by changing the filter heating controller. The wavelength-tunable procedure of the MO is also realized by simultaneously controlling the temperature of the two filters. The novel structure combined with the flexible CLPFGs filters provides an attractive way to explore the nonlinear dynamics in MO.
Based on the combination of cascaded spectral broadening induced by self-phase modulation and offset spectral filtering effect, Mamyshev oscillators have been regarded as convenient test beds for exploring complex nonlinear dynamical behaviors, including stable pulses and pulsations. Here, we demonstrate the experimental observation of bound-state pulses and period-doubling pulsations in a self-starting Yb-doped Mamyshev oscillator. The bound-state pulses operate stably in period-1 as an envelope or two envelopes with different intensities, or operate in pulsating process with period doubling. Thanks to the emerging dispersive Fourier transform technique, the transient spectra of the pulsating boundstate pulse are measured. It is shown that bound-state pulsation pulses of adjacent periods have periodic changes in the pulse shape and energy but the same spectral modulation period from one round trip to another. To our knowledge, this work provides the first observation of period-doubling bound-state pulses in a self-starting Mamyshev oscillator.
We demonstrated the formation of noise-like square-wave pulses in an Er-doped fiber laser, using a microfiber based topological insulator as a saturated absorber (SA). The SA guaranteed both excellent saturable absorption and high nonlinearity. The pulse width can be increased ranging from 0.985 to 5.503 ns by increasing the pump power from 212 to 284 mW with the polarization state fixed. Moreover, with the adjustment of the polarization controllers in the cavity, the pulse width can be adjusted obviously. Worth mentioning, it was the first time that the noise-like square-wave pulse formed in a microfiber based topological insulator fiber laser.
We experimentally investigated the polarization vector characteristics in an Er-doped fiber laser based on graphene that was deposited on microfiber. A variety of dynamic states, including polarization locked fundamental soliton, and polarization domain wall square pulses and their harmonic mode locked counterparts have all been observed with different pump powers and polarization states. These results indicated that the microfiber-based graphene not only could act as a saturable absorber but also could provide high nonlinearity, which is favorable for the cross coupling between the two orthogonal polarization components. It was worth to mention that it is the first time to obtain the polarization domain wall solitons in a mode locked fiber laser.
We experimentally generated the duration-controllable square-wave pulse from an L band dissipative soliton (DS) fiber laser based on the dispersive Fourier transformation (DFT) technique. The rectangular spectrum emitted from an L band dissipative soliton fiber laser is mapped into a time-domain coherent rectangular waveform through the DFT technique. The duration of the square-wave pulse can be controllable with the adjustments of the pump power. The results demonstrate that it is an effective and flexible way to achieve duration-controllable square-wave pulses by combinating with DFT technique and DS fiber laser.
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