Disclosed is an optical transmission fiber having reduced bending and microbending losses that is commercially usable in FTTH or FTTC transmission systems.

Single mode optical fiber

The present invention embraces a multimode optical fiber that includes a central core having an alpha-index profile, an inner cladding, a depressed trench, and an outer cladding (e.g., an outer optical cladding). Typically, the central core's alpha-index profile has a minimum refractive index at the central core's radius that corresponds to a refractive index difference with respect to the outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.

High-Bandwidth Multimode Optical Fiber Having Reduced Bending Losses

The present invention embraces an optical fiber that includes a central core having an alpha-index profile with respect to an outer cladding. The optical fiber also includes an inner cladding, a depressed trench, and an outer cladding. Typically, the alpha-index profile of the central core is interrupted at a point having a positive refractive index difference with respect to the outer cladding. The optical fiber achieves reduced bending losses and a high bandwidth with a reduced cladding effect for high-data-rate applications.

Multimode Optical Fiber with Low Bending Losses and Reduced Cladding Effect

An optical communication cable is provided. The cable includes a plurality of elongate optical transmission elements wrapped around an elongate central strength member such that a portion of the length of the plurality of wrapped elongate optical transmission elements form a spiral portion around the elongate central strength member. The cable includes an elastic sleeve surrounding the plurality of elongate optical transmission elements, and the elastic sleeve is formed from an extruded first material. The cable includes a cable body formed from an extruded second material different from the first material, and the cable body surrounds the film, and the cable body has an inner surface that faces the outer surface of the film.

Optical communication cable

Disclosed is an improved, single-mode optical fiber possessing a novel coating system. When combined with a bend-insensitive glass fiber, the novel coating system according to the present invention yields an optical fiber having exceptionally low losses. The coating system features (i) a softer primary coating with excellent low-temperature characteristics to protect against microbending in any environment and in the toughest physical situations and, optionally, (ii) a colored secondary coating possessing enhanced color strength and vividness. The secondary coating provides improved ribbon characteristics for structures that are robust, yet easily entered (i.e., separated and stripped). The optional dual coating is specifically balanced for superior heat stripping in fiber ribbons, with virtually no residue left behind on the glass. This facilitates fast splicing and terminations. The improved coating system provides optical fibers that offer significant advantages for deployment in most, if not all, fiber-to-the-premises (FTTx) systems.

Microbend-Resistant Optical Fiber

Disclosed is a fiber-optic cable that possesses a high cable filling coefficient (and/or a high cable fiber density) yet ensures that its enclosed optical fibers demonstrate improved attenuation performance when subjected to temperature variations between about −40° C. and 70° C. The fiber-optic cable is suitable for efficient installation into ducts, such as via blowing.

High-Fiber-Density Optical-Fiber Cable

Disclosed is an improved buffering method for controlling excess fiber length (EFL) and reducing post-extrusion shrinkage in loose buffer tubes. In this way, the method yields first-quality loose buffer tubes not only during steady-state operation but also during ramping, thereby increasing production efficiency and reducing waste.

Process for making loose buffer tubes having controlled excess fiber length and reduced post-extrusion shrinkage

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High-Fiber-Density Optical-Fiber Cable

Process for making loose buffer tubes having controlled excess fiber length and reduced post-extrusion shrinkage