Polarization properties of stimulated Brillouin scattering in single-mode fibers

High energy, single-mode, narrow-linewidth fiber laser source using stimulated Brillouin scattering beam cleanup

“…These two waves are then recombined to generate the output beam. However the polarization of the output beam is not controlled since the two beams with orthogonal polarization states are not phased locked after SBS in the GI fiber [16]. The reflectivity measurements are given in Fig.…”

Brillouin distributed time-domain sensing in optical fibers: state of the art and perspectives

“…In addition, the electrostriction that stimulates the acoustic wave is driven by the interference between pump and signal, so that their states of polarization must be preferably aligned to create the maximum gain. Orthogonal polarizations will result in a totally vanishing gain, and since the polarization normally varies randomly along an optical fiber [11], a non-zero gain can only be secured using polarization scrambling or a polarization-diversity scheme. This polarization dependence can also be favorably used to efficiently and rapidly measure the local birefringence properties along an optical fiber [12].…”

Self-advanced propagation of light pulse in an optical fiber based on Brillouin scattering

“…Then this Stokes wave (which we will call pump hereafter) interferes with the incident wave to stimulate the Brillouin scattering process, and creates a spectral loss at the frequency of the probe. Note that this way the signal is accurately centered in the Brillouin loss regime since the frequency difference of the probe and the pump is given by the fiber itself and remains perfectly stable without any optical component or instrument such as a modulator or a microwave generator [5]. Moreover, in the case of having a large gain, the state of polarization of the pump precisely matches that of the probe signal, since the interaction transfers photons from the pump to the probe.…”