Ofs Fitel, LLC

Furukawa Electric North America, Inc.

Ofs Fitel Llc, a Delaware Limited Liability Company

Xiaoguang Sun

Jie Li

Adam Hokansson

Kyle R Bedard

Man Fei Yan

Debra A Simoff

Robert S Dyer

Andrei A Stolov

David D Braganza

Natalia Reyngold

Kyle Bedard

Disclosed herein is a method for measuring temperature via distributed temperature sensing comprising transmitting light through a fiber optic cable; detecting backscattered light in the fiber optic cable, wherein the backscattered light comprises an anti-Stokes band and a Stokes band; calculating a ratio between an intensity of the anti-Stokes band and an intensity of the Stokes band; and using the calculated ratio to determine a temperature being sensed in the fiber optic cable; wherein the fiber optic cable comprises, from the center to the periphery; a central core having a refractive index that decreases progressively from a center of the central core to an edge of the core, wherein the refractive index follows an alpha profile; wherein a bandwidth-length product of the multimode optical fiber has a value greater than 2000 MHz-km at 1550 nm.

Broad bandwidth graded index multimode optical fiber for distributed temperature sensing in the 1550 NM region

Disclosed herein is a method comprising injecting light of a first wavelength &#x3bb;into a wavelength division multiplexer; injecting light of a second wavelength &#x3bb;into the wavelength division multiplexer; combining the light of the first wavelength &#x3bb;and the light of the second wavelength &#x3bb;in the wavelength division multiplexer to produce light of a third wavelength &#x3bb;; and reflecting the light of the third wavelength &#x3bb;in a dual-Brillouin peak optical fiber that is in communication with the wavelength divisional multiplexer; wherein the dual-Brillouin peak optical fiber has at least two Brillouin peaks, such that an amplitude Aof at least one of said Brillouin peaks is within 50% to 150% of an amplitude Aof another Brillouin peak 0.5A2&#x2264;A&#x2264;1.5A; wherein the dual-Brillouin peak optical fiber generates a Brillouin dynamic grating that reflects an improved back-reflected Brillouin signal of the combined light.

Brillouin dynamic grating generation using dual-Brillouin-peak optical fiber

Disclosed herein is an optical fiber comprising a plurality of dopant concentration profiles in a core of the optical fiber; where the first dopant concentration and the second dopant concentration are each varied in a stepwise manner and wherein a ratio of the first dopant concentration to the second dopant concentration is operative to result in an interaction of a fundamental optical mode at a given wavelength with a plurality of acoustic modes thereby increasing a ratio of Brillouin Scattering intensity ratio of secondary, tertiary or quarternary peak relative to a Brillouin Scattering intensity of a primary peak to be greater than 0.4 in a Brillouin Scattering spectrum.

Optical fibers for simultaneous measurement of temperature and strain

Embodiments are directed to a distributed temperature sensing system. The system includes a first fiber optic cable and a second fiber optic cable. A first coupler is coupled to the first fiber optic cable. A second coupler is coupled to the second fiber optic cable. An optical isolator coupled between the first coupler and the second coupler to remove a Stokes signal in order to increase the range of the distributed temperature sensing system.

Extending a range of an optical fiber distributed sensing system

Disclosed herein is a composition comprising 65 to 95 weight percent of a fluorinated monofunctional monomer; 5 to 35 weight percent of a fluorinated multifunctional monomer; and 0.5 to 3 weight percent of a silane coupling agent; where all weight percents are based on the total weight of the composition; where the fluorinated monofunctional monomer and the fluorinated multifunctional monomer are devoid of any trifunctional fluorocarbon moieties when they have 6 or more fluorocarbon repeat units; where the fluorocarbon repeat units are CFor CF moieties; and where a crosslinked composition has a shore D hardness of 56 to 85 and has a refractive index (RI) that meets the limitation of the equation RI&#x2264;1.368+10.8/X, where X denotes wavelength in nanometers.

Low refractive index coating for optical fibers, methods of manufacture thereof and articles comprising the same

Disclosed herein is an optical fiber assembly comprising a launching fiber having a receiving end and a transmitting end; an illuminating fiber having a receiving end and a transmitting end; where the receiving end of the launching fiber is operative to receive light from a light source and the transmitting end of the launching fiber is operative to transmit light to the receiving end of the illuminating fiber; where the launching fiber contacts the illuminating fiber in a manner so as to be offset from a center of a cross-sectional area of the illuminating fiber; and where the launching fiber has a diameter that is &#x215b; to &#xbd; of a diameter of the illuminating fiber; and a lens that is operative to contact the transmitting end of the illuminating fiber.

Optical fiber assembly, methods of manufacture thereof and articles comprising the same

An optical fiber includes a large graded index core of Ge doped silica for an increased bandwidth-length-product of over 100 MHz-km. A cladding layer of non-doped silica is formed on the core during the preform process and subsequently during drawing the preform an ultraviolet light curable polymer first coating is overlaid on the cladding layer. The first coating is sufficiently hardened to match the fracture characteristics of the silica core and cladding layer to facilitate crimp and cleave termination. The first coating is additionally provided with an index of refraction greater than the cladding layer to enable mode or energy stripping from the cladding layer. A second polymer layer may optionally be applied during draw for protection and to provide a tough outer layer of the optical fiber for the deformable features of a connector to hold onto after crimping.

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West Hartford, CT, United States of America

Xiaoguang Sun