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We propose the use of a figure eight fiber laser cavity in fundamental and harmonic mode-locking noise-like pulsing regimes, with output pulse energies as high as 302.8 nJ, as an improved supercontinuum source. The absence of a polarizer in the laser setup, so that the state of polarization along the cavity is not restricted, allows enhanced performances compared to other similar schemes. Noise-like pulses with durations of a few tens of ns were generated and a coherence length in the order of ps. For proper adjustments, self-starting passive mode-locking is obtained and a supercontinuum spectrum is observed at the laser output. We observe that the spectrum flatness is significantly improved in the harmonic mode-locking regime of the fiber laser. These results were achieved without the need to insert any high-nonlinearity propagation medium in the setup or at the laser output.

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We present a passively mode-locked all-fibre ring laser, working in the near-infrared region. The burst of multiple pulses generation is achieved by modifying the transmission output of the saturable absorber. Consequently, multiple modes are stimulated within the laser cavity and multiple wavelengths of operation from 1038 to 1082 nm are accomplished. Furthermore, average power and pulse energy, up to 3.48 mW and 42.9 nJ, are measured and validated. The laser exhibits high-power and wavelength stability at room temperature. In addition, the Raman effect is detected by increasing the power of the pump and up to three stokes are reached; therefore, a broadband spectrum of 140 nm is observed by changing the state of polarization within the cavity.

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In this paper a design of a graphical user interface (GUI), to observe polarization states changes on a standard single-mode optical fiber (SMF-28) that has been twisted, is presented. Here, we modify two different groups of parameters: 1) the input polarization ellipticity injected to an optical fiber; this is, the tilt or the angle of propagation and the intensity on each electric field or the shift phase; the other group is 2) the birefringence fiber values, mainly induced by mechanical efforts, since its fabrication either by pinching, bending or in general by manipulating it; obtaining simulated results that describes the output polarized light at the end of the fiber. The results are depicted on the Poncairé Sphere and Stokes parameters graphics. Moreover, the GUI was developed in Visual Basic, used for the interface windows, and it was connected to Matlab, used like mathematic engine.

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