whats difference between in SRS and SBS in fiber optic?

in nonlinear effect fiber optic :
we have a part:
Stimulated Scattering:

in this part we have two phenomenon

• Stimulated Brillouin Scattering (SBS)
• Stimulated Raman Scattering (SRS)

whats difference this two?
i think they are same!
- Stimulated Brillouin Scattering is a scattering of light backwards towards the transmitter caused by mechanical (acoustic) vibrations in the transmission medium (fiber). The reflected wave produced is called the ?Stokes Wave?.
- Stimulated Brillouin Scattering is caused by the presence of the optical signal itself.

can any guide me

thanks

The different possibilities of light scattering: Rayleigh scattering (no exchange of energy: incident and scattered photons have the same energy), Stokes Raman scattering (atom or molecule absorbs energy: scattered photon has less energy than the incident photon) and anti-Stokes Raman scattering (atom or molecule loses energy: scattered photon has more energy than the incident photon)
thanks for attention

in Raman scattering is talked that energy is photon is reduced
http://hyperphysics.phy-astr.gsu.edu...mos/raman.html
really which is true?



http://epsc.wustl.edu/haskin-group/Raman/faqs.htm
i concluded it can increase or decrease