In this paper, a dual-wavelength square pulses fiber laser with tunable pulse width based on nonlinear polarization rotation and nonlinear effect was studied. The fiber laser containing a 1050-m highly nonlinear fiber operated at central wavelengths of 1533 nm and 1569 nm and the repetition rate was 194.7 kHz. While the polarization state of the laser was unchanged, the pump power was increased from 100 mW to 300 mW, and the pulse width was extended from 163.6 ns to 558.2 ns. In this process, the maximum energy of a single pulse was 8.57 nJ. The simple, compact square pulse dual wavelength fiber laser with tunable pulse width can meet great potential for applications.
We demonstrated an experimental observation of bright-dark pulse pair and soliton bunch in mode-locked erbium-doped fiber ring laser with the saturable absorber (SA) of graded index multimode fiber-step index multimode fiber-graded index multimode fiber (GIMF-SIMF-GIMF), which utilizes nonlinear multimode interference inside the multimode fiber to realizing mode locking of fiber laser. During the experiment, we observed a fascinating phenomenon of dualwavelength bright-dark pulse pair, in which the wavelengths of the two wavelengths are 1558.5 nm and 1560.1 nm, respectively, and the wavelength interval is 1.6 nm. The PBS filter was used to verify that the bright and dark pulses are orthogonal to each other in polarization. We also obtained multiple set of soliton bunches running at the fundamental frequencies of 100.5 ns, and when we increase the pump power we could find that the number of optical solitons increases in a single soliton bunch, which experimental phenomenon is in appropriate agreement with the theory. Based on the observation and understanding of these experimental phenomena, it is beneficial to explore the rich nonlinear effects in the mode-locked fiber laser.
We investigate the conversion of mode locking of bright pulses, dark pulses and dark-bright pulses in an Erbium-doped fiber laser (EDFL) based on a Molybdenum disulfide (MoS2) films saturable absorber (SA) experimentally. When the pump power is 150 mW, by changing the polarization controller (PC) to change the polarization state in the laser cavity, we observed the bright pulse trains, the dark pulse trains and the dark-bright pulses trains in turn. All pulse interval are about 58 ns, and the repetition frequency of pulse is 1.7 MHz. The study provides a method for the conversion among bright pulses, dark pulses and dark-bright pulses.
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