Investigation of Q-Switching Characteristics in Single- and Double-Spacing Multi-Wavelength Brillouin Erbium Fiber Laser

Abstract

A multi-wavelength Brillouin erbium fiber laser (BEFL) with a Q-switching characteristic is demonstrated using a piece of non-zero dispersion shifted fiber (NZ-DSF) as a Brillouin gain medium (BGM) in conjunction with relaxation oscillation technique. The performance of the multi-wavelength short pulse generation is investigated for two different BEFL configurations for single and double Brillouin spacing outputs. The Q-switched BEFL generates a pulse train with repetition rates of 10.36 and 20.41 kHz whose corresponding pulse widths are 13.21 and 3.84 s for the single and double Brillouin spacing outputs, respectively. The self-starting pulses are obtained within a low 1480-nm pump power region at a slightly higher power than the lasing threshold power. This pulse laser based on stimulated Brillouin scattering (SBS) is fairly stable at room temperature.

Multiwavelength Brillouin-Thulium Fiber Laser

“…The components in the laser cavity were all fiberized and fusion spliced together, which enhanced the stability and practicality of the multiwavelength BTFL. Two polarization controllers (PCs) were placed at both ends of the SMF-28 fiber to control the polarization states of the BP and Stokes light, which can also play an important role in offering the intracavity filtering effects [31], [32].…”