US 12,407,144 B2
Optical fiber assembly for mitigating stimulated Brillouin scattering
Mathieu Boivin, Quebec (CA)
Assigned to INSTITUT NATIONAL D'OPTIQUE, Quebec (CA)
Filed by INSTITUT NATIONAL D'OPTIQUE, Quebec (CA)
Filed on Jun. 10, 2022, as Appl. No. 17/837,124.
Prior Publication US 2023/0402809 A1, Dec. 14, 2023
Int. Cl. H01S 3/00 (2006.01); H01S 3/067 (2006.01)
CPC H01S 3/06716 (2013.01) [H01S 3/06733 (2013.01); H01S 2301/03 (2013.01)] 18 Claims
OG exemplary drawing
 
1. An optical fiber assembly for mitigating stimulated Brillouin scattering (SBS), the optical fiber assembly comprising:
an optical fiber comprising:
a core extending along a longitudinal fiber axis; and
one or more claddings surrounding the core and extending along the longitudinal fiber axis, an innermost one of the one or more claddings having a refractive index that is lower than a refractive index of the core, the one or more claddings comprising an inner doped region contiguous to the core, the inner doped region having a composition comprising a cladding glass material doped with at least one acoustic-velocity-lowering and refractive-index-raising dopant and at least one acoustic-velocity-lowering and refractive-index-lowering dopant, the composition of the inner doped region being selected to provide the optical fiber with a radial acoustic velocity profile in which a longitudinal acoustic velocity within the inner doped region is equal to or less by at most 0.5% than a longitudinal acoustic velocity within the core; and
a winding support configured to hold the optical fiber in a winding arrangement,
wherein the radial acoustic velocity profile and the winding arrangement of the optical fiber provide SBS mitigation by reducing a mode overlap between an optical mode guided in the core and acoustic modes comprising a guided acoustic mode and a leaky acoustic mode.