We present a technique for improving the pulse-delay performance of a stimulated Brillouin scattering (SBS) based broadband slow-light system by combining it with fiber Bragg gratings (FBG). We optimize the physical device parameters of three systems: (1) broadband SBS, (2) broadband SBS + a single FBG, and (3) broadband SBS + a double FBG for maximizing the delay performance. The optimization is performed under distortion and system resource constraints for a range of bit rates from 0.5 to 8.5 Gbps. We find that an optimized broadband SBS + a double FBG system improves the fractional delay 1.8 times that of the broadband SBS system at an optimum bit rate of 3 Gbps. Also, pump power consumption is reduced by 15% as compared to the broadband SBS system at the same bit rate.
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http://dx.doi.org/10.1364/ao.47.006404 | DOI Listing |
We present a scalar, time-dependent, plane-wave model for stimulated Brillouin scattering (SBS) within a fiber amplifier having a seed linewidth comparable to, or greater than, the Brillouin frequency shift. The broadband model introduces the existence of a backward anti-Stokes wave, in addition to the Stokes wave present in the narrowband model. The model also incorporates a Fresnel reflection within the fiber or at the exit face.
View Article and Find Full Text PDFAn approach to suppressing Brillouin scattering-induced noise in long-haul high-power radio-over-fiber (RoF) links is proposed via non-uniformly distributed four-tone phase modulation. Four single-tone signals with uneven frequency intervals are utilized to phase modulate the optical signal before transmission. The power transferring from the optical carrier to the non-uniformly distributed modulation sidebands largely suppresses the Brillouin scattering-induced relative intensity noise (RIN).
View Article and Find Full Text PDFStimulated Brillouin scattering (SBS) is a nonlinear optical phenomenon mediated from the coupling of photons and phonons. It has found applications in various realms, yet the acousto-optic interaction strength remains relatively weak. Enhancing the SBS with resonant structures could be a promising solution, but this method faces strict constraints in operational bandwidth.
View Article and Find Full Text PDFRev Sci Instrum
July 2024
Orion Laser Facility, Atomic Weapons Establishment plc, Reading RG7 4PR, United Kingdom.
A full aperture backscatter system (FABS) is currently in development on the Orion laser at AWE to measure scattered light from the stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) processes. The light is to be collected through the full aperture of the final optic assembly and traverse back down the beam path, with fractions of this light being directed to an optics table. By measuring the energy of this backscattered light, it is possible to gain insight into some of the laser-plasma instabilities that are present on the laser system and should give an indication of some of the scattered light losses due to the SBS and SRS processes.
View Article and Find Full Text PDFPhys Rev Lett
January 2024
Shanghai Institute of Laser Plasma, China Academy of Engineering Physics, Shanghai 201800, China.
We report the first experimental observation on the reduction of backward scatterings by an instantaneous broadband laser with 0.6% bandwidth in conditions of interest for inertial confinement fusion at the low-coherence Kunwu laser facility. The backscatter of stimulated Brillouin scattering (SBS) was robustly reduced by half at intensities of 1-5×10^{14} W/cm^{2} with the 0.
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