Analyzing the complex dynamics of the temporal RMS width of noise-like pulses

Noise-like pulses (NLPs) are ultrashort light pulses that have the characteristic that their electric field has a very complex internal structure. Due to this characteristic, the envelope can be tuned in several shapes (Gaussian, triangular, square, etc.). The amplitude and temporal width vary with respect to many variables, for example, the polarization of the light within the cavity, the pump power, etc. In this work, we present a theoretical and experimental analysis of the temporal RMS widths of NLPs when the laser cavity operates in the stationary mode (the properties of the NLPs remain constant) measured within the mode-locked regions. Our laser cavity has a configuration of an erbium-doped figure-eight fiber laser. The experimental measurements of the temporal RMS widths of the NLPs were compared with the simplest theoretical model of light intensity transmission and with the theoretical model of the NOLM. We analyze NLPs with a wavelength carrier of 1560 nm, a repetition rate of 60 MHz, and a temporal profile with a duration in the order of nanoseconds.