Optical fiber with improved bending behavior

Abstract

An optical fiber with improved bending behavior is disclosed. The optical fiber, a single mode optical fiber having core and clad, satisfies alpha-profile wherein a refractive index in the core is increased toward its center, and has a specific refractive index difference Delta1 in the central region of the core and Delta2 at a radius rcore of the core. The optical fiber also satisfies a mode field diameter of 8.6~9.5 m at 1310nm wavelength, a zero dispersion wavelength of 1300~1324nm, a dispersion of 18 ps / nm-km or less at a 1550nm, a cable cutoff wavelength of 1260nm or less, a bending loss of 0.1dB or less at 1625nm when wound 100 times with a bending radius of 25mm. Thus, the optical fiber may satisfy every optical characteristic such as zero dispersion wavelength and dispersion at 1500nm, suggested by the general and common signal mode optical fiber, though the bending loss is decreased.

Description

technical field [0001] The present invention relates to an optical fiber, and more particularly to a single-mode optical fiber whose zero-dispersion wavelength, mode field diameter, and cut-off wavelength meet the general single-mode optical fiber standard and the optical characteristics exhibited in ordinary single-mode optical fibers, while the Single-mode fiber has low bend loss. Background technique [0002] Optical fibers have excellent transmission loss and bandwidth properties compared to those of copper wires and polymer optical fibers, but it is difficult to handle them at the time of accommodation, installation, and the like. In particular, bending losses pose problems. In the case of bending a fiber, the field of the fundamental mode deviates from the central region of the core, and some of the optical power traveling to the core does not pass through the fiber, but is lost, known as bend loss. When the fiber is wound up with a constant bend radius, the optical ...

AI Technical Summary

Problems solved by technology

However, if a conventional optical fiber optimized for the 1,550 nm wavelength band is also used at the 1,600 nm wavelength band, the bending loss increases especially due to the increased mode field diameter

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