Patent ID: 6603912
Filing Date: 2003-08-05
Classification: B82Y,C03B,G02B,H01S

Abstract:
An optical fiber for transmitting radiation having a wavelength, said fiber comprising:a core comprised of a substantially transparent core material, having a core refractive index, and a length, and having a core diameter not equal to 4.6 &mgr;m; and a cladding region surrounding the length of core material, wherein the cladding region is comprised of a first substantially transparent cladding material, having a first refractive index, and wherein the first substantially transparent cladding material has a substantially periodic array of holes embedded therein, each hole having a diameter d, and said holes being spaced apart by a pitch &Lgr;, wherein the holes have a second refractive index which is less than the first refractive index, the first and second refractive indices combining to produce an effective refractive index that has a value dependent on said wavelength of said radiation, such that, below a threshold wavelength, said radiation does not undergo a mode change during transmission along the length of the core material.