Stimulated Raman scattering in a fiber with bending loss

Summary form only given. SRS is relevant to many aspects of optical communication systems, optical data processing systems and optical amplifiers. At high power level SRS leads to multiple order Stokes generation. For many applications the suppression of higher order Stokes is desired. An examination of the equations describing SRS reveals that SRS can be suppressed by high Stokes attenuation distributed along the fiber. The numerical simulation results show, that the higher order Stokes loss can significantly increase the power of low order Stokes. The distributed fiber loss must depend strongly on wavelength for this technique to be effective. The simplest way to introduce wavelength dependent distributed losses is to bend a fiber. The bend-induced loss depends strongly on the wavelength and bend radius. The results presented show that the bend-induced loss may be high sufficiently for the second Stokes to be suppressed, and at the same bend diameter the loss may be negligible for the first Stokes.