Spontaneous Rayleigh Seed for Stimulated Rayleigh Scattering in High Power Fiber Amplifiers

Spontaneous inelastic Rayleigh scattering in optical fibers.

Rayleigh scattering (RS) adds noise to signals that are transmitted over optical fibers and other optical waveguides. This noise can be the dominant noise source in a range between 10 Hz and 100 kHz from the carrier and can seriously degrade the performance of optical systems that require low close-in noise. Using heterodyne techniques, we demonstrate that the backscattered close-in noise spect...

Spontaneous Rayleigh-Brillouin Scattering on Atmospheric Gases

Suppressing the stimulated Brillouin scattering in high power fiber amplifiers by dual-single- frequency amplification

We demonstrate the suppression of stimulated Brillouin scattering (SBS) in high power fiber amplifiers by a dual-single-frequency amplification. The output power of dualsingle-frequency fiber amplifiers in all-fiber configuration is boosted to 275 W with seeds central wavelength of 1063.7 and 1064.4 nm, respectively. The power conversion efficiency is 76.6%. The maximum output power is limited ...

Intracavity power measurement by Rayleigh scattering.

by Liou in Fig. 8 of Ref. 4, namely, elevation angle e = 60°, wavelength X = 0.7 yum, mode radius am = 4 Aim, and refractive index m = 1.310. The phase functions P(O,4) are not normalized and are shown as a function of the scattering angle 0 in different 4)-planes. The azimuthally averaged phase function is also shown by the solid line. One of the prominent differences between the present phase...

Distributed Temperature and Strain Discrimination with Stimulated Brillouin Scattering and Rayleigh Backscatter in an Optical Fiber

A distributed optical fiber sensor with the capability of simultaneously measuring temperature and strain is proposed using a large effective area non-zero dispersion shifted fiber (LEAF) with sub-meter spatial resolution. The Brillouin frequency shift is measured using Brillouin optical time-domain analysis (BOTDA) with differential pulse-width pair technique, while the spectrum shift of the R...