Fig. 4: Theoretical investigations.
From: Brillouin-induced Kerr frequency comb in normal dispersion fiber Fabry Perot resonators
a Parametric gain curves from theoretical predictions (green curve Eq. (6)) for δ = 0.083 rad. The cavity resonances (vertical dashed lines) as well as the SBS gain (red dashed curve) are superimposed. The intersection between the parametric gain curve and the cavity resonances are highlighted by blue circles. The purple curve represents the approximation of the parametric gain without the SBS gain contribution (Eqs. (6) and (9))). b Nonlinear transfer function of the cavity for P = 0.8 W. The green area represents the cavity detuning interval over which the parametric process can exist. c Parametric gain as a function of the pump power. Black curve corresponds to the marginal stability, and the pink dashed dotted line show the evolution of the perfect phase-matching frequency (Eq. (10)). d Phase-mismatch curves (Eq. (7)), real part (green curve), imaginary part (light blue) and approximate relation (Eq. (9), red dashed lines). e Nonlinear transfer function of the cavity for δ = 0.083. f, g Parametric gain curves with and without SBS respectively for δ = 0.083.
