Dual core photonic crystal fibers (PCF) with special dispersion properties

摘要

An optical fiber for transmitting light, said optical fiber having an axial direction and a cross section perpendicular to said axial direction, said optical fiber comprising: (1) a first core region comprising a first core material having a refractive index N_co,1; (2) a microstructured first cladding region surrounding the first core region, said first cladding region comprising a first cladding material and a plurality of spaced apart first cladding features or elements that are elongated in the fiber axial direction and disposed in the first cladding material, said first cladding material having a refractive index N_cl,1 and each said first cladding feature or element having a refractive index being lower than N_cl,1, whereby a resultant geometrical index Nge,cl, 1? of the first cladding region is lowered compared to N_cl,1; (3) a second core region surrounding said first cladding region, said second core region comprising a second core material having a refractive index N_co,2, and (4) a second cladding region surrounding the second core region, said second cladding region comprising a second cladding material having a refractive index N_cl,2, wherein the first core material, the first cladding material and the first cladding features, the second core material, and the second cladding material are selected and arranged so that N_co,1>N_ge,cl,1, N_co,2>N_ge,cl,1, and N_co,2>N_cl,2.