Optical fiber with improved bending behavior

A technology of optical fiber and single-mode optical fiber, applied in the direction of multi-layer core/clad optical fiber, clad optical fiber, light guide, etc., can solve the problems of increased mode field diameter and increased bending loss

CN1942793AInactive Publication Date: 2007-04-04LG CABLE LTD (KR)
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2007-04-04
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Examples

Embodiment Construction

[0038] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before proceeding to the description, it should be understood that the terms used in this specification and appended claims should not be construed as limited to the ordinary and dictionary meanings, but should be used to best allow the inventors to properly define the terms. The terms used in the specification and the appended claims are interpreted based on the meanings and concepts corresponding to the various technical aspects of the present invention on the basis of the principle of explanation. Therefore, the description given here is only a preferred example for the purpose of illustration only, and is not intended to limit the scope of the present invention, so it should be understood that other embodiments of the present invention can be made without departing from the spirit and scope of the present invention. Equivalents and Mod...