Brillouin scattering

About: Brillouin scattering is a research topic. Over the lifetime, 11426 publications have been published within this topic receiving 178306 citations.

Theoretical and experimental investigation of Brillouin scattering for the generation of millimeter waves

Abstract: We investigate and discuss stimulated Brillouin scattering in optical fibers for the generation of millimeter waves in theory and experiment. With a derivation of the responsible differential equation system we show that the phases of two independently amplified sidebands of a frequency comb will remain the same. Neither third-order nonlinear effects like self- and cross-phase modulation nor the Brillouin amplification has an influence on the phases. We verify our theoretical predictions with phase noise measurements of the generated millimeter-wave signal. The results show that the generated phase noise is in fact very low.

High power narrow-band fiber-based ASE source

Abstract: In this paper we describe a high power narrow-band amplified spontaneous emission (ASE) light source at 1030 nm center wavelength generated in an Yb-doped fiber-based experimental setup. By cutting a small region out of a broadband ASE spectrum using two fiber Bragg gratings a strongly constrained bandwidth of 12 ± 2 pm (3.5 ± 0.6 GHz) is formed. A two-stage high power fiber amplifier system is used to boost the output power up to 697 W with a measured beam quality of M2≤1.34. In an additional experiment we demonstrate a stimulated Brillouin scattering (SBS) suppression of at least 17 dB (theoretically predicted ~20 dB), which is only limited by the dynamic range of the measurement and not by the onset of SBS when using the described light source. The presented narrow-band ASE source could be of great interest for brightness scaling applications by beam combination, where SBS is known as a limiting factor.

Tunable narrowband microwave photonic filter created by stimulated Brillouin scattering from a Silicon nanowire

Abstract: We demonstrate the first functional signal processing device based on stimulated Brillouin scattering in a silicon nanowire. We use only 1 dB of on-chip SBS gain to create an RF photonic notch filter with 48 dB of suppression, 98 MHz linewidth, and 6 GHz frequency tuning. This device has potential applications in on-chip microwave signal processing and establishes the foundation for the first CMOS-compatible high performance RF photonic filter.

Compact Brillouin-erbium fiber laser.

Abstract: A single-wavelength Brillouin fiber laser (BFL) is demonstrated at the extended L-band region using bismuth-based erbium-doped fiber (Bi-EDF) for the first time to the best of our knowledge. A 2.15-m-long Bi-EDF is used to provide both nonlinear and linear gains to generate a stimulated Brillouin scattering (SBS) and to amplify the generated SBS, respectively. The BFL operates at 1613.93 nm, which is upshifted by 0.09 nm from the Brillouin pump with a peak power of 2 dBm and a side-mode suppression ratio of more than 22 dB. The generated BFL has a narrow linewidth and many potential applications, such as in optical communication and sensors.

Determination of the parameters of a nonlinear response of liquids in an acoustic resonance region by the method of nondegenerate four-wave interaction

Abstract: The method of nonlinear four-wave interaction spectroscopy was used to record the spectra of acoustic resonances of seven liquids active in stimulated Brillouin scattering (STBS) at frequencies corresponding to the backscattering of laser radiation in neodymium glass. These measurements made it possible to determine in the same experiment the STBS gain and the decay time and velocity of propagation of hypersound in the liquids.