Trench-assisted multimode optical fiber

摘要

A trench-assisted, multimode optical fiber includes a central core having an alpha refractive index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth.

主权项

1. A multimode optical fiber, comprising:
a central core surrounded by an outer cladding, said central core having an outer radius r1 and an alpha-index profile with respect to said outer cladding; an inner cladding positioned between said central core and said outer cladding, said inner cladding having (i) an outer radius r2, (ii) a width w2, and (iii) a refractive index difference Δn2 with respect to said outer cladding; and a depressed trench positioned between said inner cladding and said outer cladding, said depressed trench having (i) an outer radius rt, (ii) a width wt, and (iii) a negative refractive index difference Δnt with respect to said outer cladding; wherein said depressed trench has a negative volume V defined by the expression V=1000×wt×Δnt, said depressed trench's negative volume V having an absolute value of greater than 20 microns; wherein, at a wavelength between about 840 nanometers and 860 nanometers, the multimode optical fiber exhibits a leaky-mode bandwidth (EMBleaky) of about 2,550 MHz-km or greater at 400 meters.