Study of Brillouin gain spectrum in standard single-mode optical fiber at low temperatures (1.4–370 K) and high hydrostatic pressures (1–250 bars)

Analytic modeling of Brillouin gain in rare-earth doped fiber amplifiers with high-power single-frequency signals

“…The difference between the values of Γ 0 and g 0 for bulk silica (Γ 0 = 36 MHz and g 0 = 5.10 -11 m/W [13]) and fiber are caused by waveguide induced broadening of the SBS spectrum and decrease of g respectively [14]. Temperature coefficients of the Brillouin frequency and bandwidth, C f and C δ respectively, are taken from [12] where these were measured for λ = 1.55 µm. Their values are extrapolated to λ = 1.06 µm giving C f = 2 MHz/K and C δ = -0.2 MHz/K.…”

Dependence of Brillouin frequency shift on radial and axial strain in silica optical fibers

“…The following experiment was done with a singlemode silica optical fiber by the Brillouin optical time domain analysis (BOTDA) technique [8][9][10][11], which is a well developed method for measuring the BFS along the fiber. The block diagram of the main components is illustrated in Fig.…”

“…In fact, it is a hybrid effect of axial strain and radial strain on the BFS, because the axial strain will commonly be accompanied with the radial strain. Although Floch and Cambon [10] experimented on the relation of the BFS and pressure, they did not analyze or explain further how the pressureinduced radial and axial strain changes the BFS. To our knowledge, there has been no experiment or discussion on the quantitative relations between the BFS and both values of radial and axial strain in silica optical fibers.…”

<title>Slow light in optical fiber using stimulated Brillouin scattering</title>

“…6 , Γ B is approximately doubled when the temperature is reduced from ~300 K to ~ 100 K, which is far less than needed.…”