Low diameter optical fiber

摘要

Small-radius coated optical fibers having large mode field diameter and low bending losses. The coated fiber may have an outer radius of 110 μm or less, while providing a mode field diameter of 9.0 μm or greater and a bending loss when wrapped about a 15 mm mandrel of 0.5 dB/km or less at wavelength of 1550 nm. The coated fiber may have a mode field diameter of 9.2 μm or greater and may have a bending loss at 1550 nm of 0.25 dB/km or less when wrapped about a 20 mm mandrel or a bending loss at 1550 nm of 0.02 dB/km or less when wrapped about a 30 mm mandrel.

主权项

1. An optical fiber comprising:
a core, said core having an outer radius r1; a cladding surrounding said core, said cladding having an outer radius r4; a primary coating surrounding said cladding, said primary coating having an outer radius r5, said primary coating having an in situ modulus of 0.50 MPa or less; and a secondary coating surrounding said primary coating, said secondary coating having an outer radius r6, said secondary coating having an in situ modulus of 1500 MPa or greater; wherein said outer radius r6 is 110 μm or less, said fiber has a mode field diameter of greater than 9 μm at 1310 nm, a cable cutoff wavelength of 1260 nm or less, a zero dispersion wavelength λ0 in the range 1300 nm≦λ0≦1324 nm, and said fiber exhibits a bend loss at a wavelength of 1550 nm, when turned about a mandrel having a diameter of 20 mm, of less than 0.5 dB/turn.