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Abstract

A multicore optical fiber including four cores arranged in a linear configuration, the centerline of each core being spaced from the centerline of an adjacent core by a distance x of about 30 microns or less, and each core having a relative refractive index Δ₁. A cladding surrounding each of the four cores, the cladding including an inner cladding region with a relative refractive index Δ₂, a depressed-index cladding region with a relative refractive index Δ₃, and an outer cladding region with a relative refractive index Δ₄, wherein Δ₁>Δ₂>Δ₃ and Δ₁>Δ₄>Δ₃. Furthermore, each core of the four cores has a mode field diameter, at a wavelength of 1310 nm, of about 8.1 microns or less, and cross talk between adjacent cores is about −18 dB or less at wavelengths of 1310 nm and 1550 nm per 2 km fiber length.

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First Claim