Patent ID: 7817892
Filing Date: 2010-10-19
Classification: G02B

Abstract:
1. A bend insensitive fiber optic cable, comprising: a singlemode fiber; a tight buffer layer surrounding the fiber, wherein a thickest component of the buffer layer has an elastic modulus greater than 515 MPa (75,000 psi); and an outer jacket surrounding the buffer layer, wherein the jacket has a thickness of at least 1.2 mm and an outside diameter of approximately 4.7 mm; wherein the fiber comprises a core and a cladding region for propagating light in a fundamental transverse mode, and the cladding region includes (i) an outer cladding having a refractive index less than the refractive index of the core (n (ii) an annular pedestal region having a refractive index (n (iii) an annular inner trench region disposed between the core and the pedestal region, the inner trench region having a refractive index (n (iv) an annular outer trench region disposed between the pedestal region and the outer cladding, the outer trench region having a refractive index (n wherein at least one of |n an interface between the outer cladding and the outer trench region is located at a radial distance of 17 to 23 microns from the center of the core.