Patent ID: 6807350
Filing Date: 2004-10-19
Classification: G02B

Abstract:
An optical fiber comprising:a core having a diameter dc and a refractive index nc; a primary cladding concentrically surrounding the core and having an outer diameter dpc and a refractive index npc less than the core refractive index nc, wherein the refractive index npc is substantially constant through the primary cladding; and a secondary cladding concentrically surrounding the primary cladding and having an outer diameter dsc and a refractive index nsc less than the primary cladding refractive index npc, wherein the primary cladding outer diameter dpc is a fraction of the secondary cladding outer diameter dsc, and wherein a difference between the primary cladding refractive index npc and the secondary cladding refractive index nsc is greater than or equal to a constant and less than or equal to the core refractive index nc less the constant.