Patent ID: 9634462
Date: 2017-04-25
CPC Classifications: G02B,H01S

Claim:
1. An apparatus, comprising: an optical fiber including a core and cladding, the core being situated to propagate an optical beam along a propagation axis associated with the core; and at least one fiber Bragg grating (FBG) situated in the core of the optical fiber, the fiber Bragg grating including a plurality of periodically spaced grating portions situated with respect to the propagation axis so that light associated with Raman scattering is directed out of the core so as to reduce the generation of optical gain associated with stimulated Raman scattering (SRS); wherein the FBG defines a reflection bandwidth that is offset from a center wavelength of a first Raman Stokes wavelength range of the optical beam so as to compensate for a shift of the reflection bandwidth associated with localized heating of the FBG from the propagation of the optical beam.