Ofs Fitel, LLC

Durgesh Vaidya

George Edward Oulundsen, Iii

Man Fei Yan

David John DiGiovanni

Jinkee Kim

Robert Lingle, Jr

Xinli Jiang

Roman Shubochkin

Kasyapa Balemarthy

Michael LuValle

James William Fleming

Robert L Lingle

Yi Sun

Michael J LuValle

Described is a technique for the design and manufacture of MMFs. Designs are implemented so as to limit the maximum variation in z(r, &#x3bb;) with respect to wavelength, where z(r, &#x3bb;) is the dielectric constant weighted by the square of the wavelength. MMFs for use in CWDM applications are specifically described.

Manufacture of multi-mode optical fibers

The specification describes multimode optical fibers with specific design parameters, i.e., controlled refractive index design ratios and dimensions, which render the optical fibers largely immune to moderately severe bends. The modal structure in the optical fibers is also largely unaffected by bending, thus leaving the optical fiber bandwidth essentially unimpaired. Bend performance results were established by DMD measurements of fibers wound on mandrels vs. measurements of fibers with no severe bends. Additional embodiments of the present invention describe an improved optical link when the inventive multimode fiber is connected to standard or conventional multimode fibers.

Bandwidth-maintaining multimode optical fibers

Described is a design approach to fabricating broadband graded-index multimode fibers where the concentration profile of at least one dopant in the core region includes at least one flat-zone. Designs for use in CWDM applications are also disclosed.

Broadband multi-mode optical fibers with flat-zone in dopant concentration profile

Optical fiber designs are depicted with a core having an alpha profile inner portion and a steep vertical step between the core and a cladding with no shoulder, referred to herein as a truncated core. A further aspect of this invention can include a trench between the truncated core and cladding. In this embodiment, the core performs as not only as the primary light guiding structure, but now also functions essentially the same as that of a trench structure. Thus, what was formally a trench can now be much less negative or even positive. Another embodiment of the present invention includes an optical fiber having a truncated core with the addition of a ledge or shoulder between the core and vertical step, followed directly by a cladding.

Optical fibers with truncated cores

Adverse hydrogen aging limitations in multiply-doped optical fibers are overcome by passivating these optical fibers using a deuterium passivation process. This treatment essentially pre-reacts the glass with deuterium so that the most active glass sites are no longer available to react with hydrogen in service. Optical fibers of main interest are doped with mixtures of germanium and phosphorus. Optimum passivating process conditions are described.

Accelerated aging of phosphorus-doped optical fibers

The specification describes multimode optical fibers with specific design parameters, i.e., controlled refractive index design ratios and dimensions, which render the optical fibers largely immune to moderately severe bends. The modal structure in the optical fibers is also largely unaffected by bending, thus leaving the optical fiber bandwidth essentially unimpaired. Bend performance results were established by DMD measurements of fibers wound on mandrels vs. measurements of fibers with no severe bends.

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Southbridge, MA, United States of America

Durgesh Vaidya