Noise Gain Features of Fiber Raman Amplifier

Figure 1

Spontaneous Raman spectrum (dotted line) and Raman gain profile (solid line) in Stokes shifted frequency area from 0 to 21 THz (700 cm⁻¹) for standard silica fiber. Thermal phonon factor as function of Raman shift frequency at  K is shown on the right hand inset.