Time-Dependent Modeling of Brillouin Scattering in Optical Fibers Excited by a Chirped Diode Laser

Abstract

Numerical simulations are used to solve the coupled partial differential equations describing stimulated Brillouin scattering (SBS) built up from random thermal phonons as a function of time and the longitudinal spatial coordinate in an optical fiber. In the case of a passive fiber, a laser beam is incident with constant power, but its frequency is linearly ramped at 1.55 microns at a rate of up to 10(to the 16th power) Hz/s. High chirp rates lead to an increased Brillouin spectral bandwidth and decreased gain. The resulting SBS suppression is well described by an adiabatic model and agrees with experimental results. For an 18-m active fiber pumped at 1.06 microns and chirped at up to 2 x 10(to the 16th power) Hz/s, the suppression enables output laser powers in the kilowatt range while maintaining a narrow instantaneous linewidth.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Oct 31, 2012
Accession Number
ADA579954

Entities

People

  • Carl E. Mungan
  • Jeffrey O. White
  • Naresh Satyan
  • Steven D. Rogers

Organizations

  • United States Army Research Laboratory

Tags

DTIC Thesaurus Topics

  • Amplifiers
  • Brillouin Scattering
  • Differential Equations
  • Electronic Counter Countermeasures
  • Electronics
  • Equations
  • Fibers
  • Frequency
  • Laser Beams
  • Laser Diodes
  • Lasers
  • Materials
  • Materials Science
  • Optical Fibers
  • Partial Differential Equations
  • Scattering
  • Simulations

Fields of Study

  • Physics

Readers

  • Calculus or Mathematical Analysis
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy