Low bend loss optical fiber
AssigneeCorning Incorporated
InventorsScott R. Bickham, Snigdharaj K. Mishra, Steven S. Rosenblum
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Abstract
An optical fiber having both low macrobend loss and low microbend loss. The fiber has a MAC number less than 7.0 and a zero dispersion wavelength less than 1450 nm. The optical fiber advantageously comprises a primary coating and a secondary coating. The primary coating has a Young's modulus of less than 1.0 MPa and a glass transition temperature of less than −25° C. The secondary coating surrounds the primary coating, and the secondary coating has a Young's modulus of greater than 1200 MPa. The macrobend loss as measured by a 20 mm diameter bend test at 1550 nm is not more than 5.0 dB/m. Optical fiber ribbon and optical fiber cable that include the optical fiber is also disclosed.
Claims20
An optical fiber comprising:
- a core region having a refractive index profile;
- an outermost annular cladding region surrounding the core region;
- a primary coating contacting and surrounding the outer annular cladding region, the primary coating having a Young's modulus of less than 1.0 MPa and a glass transition temperature of less than −25° C.;
- a secondary coating surrounding the primary coating, the secondary coating having a Young's modulus of greater than 1200 MPa;
- wherein the refractive index profile is selected to provide a MAC number of not more than 7.0, a zero dispersion wavelength of less than 1450 nm, and a 20 mm diameter bend loss at 1550 nm of not more than 5.0 dB/m.
Dependencies are inferred from the claim text.