LOW BEND LOSS OPTICAL FIBER

摘要

One embodiment of a single mode optical fiber includes: a graded index central core region having outer radius r1 and relative refractive index Delta1; a cladding region comprising (i) a first inner cladding region having an outer radius r2 < 10 microns and relative refractive index Delta2 and 0.65 <=r1 /r2 <= 1; (ii) and a second inner cladding region (i.e., trench) having an outer radius r3 > 10 microns and comprising a minimum relative refractive index Delta3, wherein said second inner cladding region has at least one region with a relative refractive index delta that becomes more negative with increasing radius; and (iii) an outer cladding region surrounding the second inner cladding region and comprising relative refractive index Delta4, wherein Delta1 > Delta2 > Delta3, Delta3 < Delta4.