Abstract: Described herein are systems, methods, and articles of manufacture for a coated fiber modified by actinic radiation to increase back-scattering, which experiences very little back-scattering decay at a temperature and time of exposure that is sufficient to noticeably degrade the coating and/or noticeably degrade the optical fiber due to outgassing of hydrogen from the coating. In one embodiment, an optical fiber comprises a fiber length, a coating having a treated coating weight, wherein the treated coating weight is at least 25% less of an original coating weight prior to an annealing treatment, and an optical back-scatter along the fiber length greater than a Rayleigh back-scattering over the fiber length, wherein the optical back-scatter does not decrease along the fiber length by more than 3 dB after exposure to annealing treatment.

Abstract: Disclosed herein is an optical cable comprising a support; flexible protective tubes helically wound around the support, each flexible protective tube comprising an optical fiber comprising an optical core; a cladding disposed on the core; and a primary coating external to the cladding; and a deformable material surrounding the optical fiber; an outer jacket surrounding the flexible protective tubes; wherein each optical fiber is about 0.5% to about 1.

Abstract: Disclosed herein is an optical cable comprising a support; flexible protective tubes helically wound around the support, each flexible protective tube comprising an optical fiber comprising an optical core; a cladding disposed on the core; and a primary coating external to the cladding; and a deformable material surrounding the optical fiber; an outer jacket surrounding the flexible protective tubes; wherein each optical fiber is about 0.5% to about 1.

Abstract: Disclosed herein is an optical cable comprising a plurality of cable sensors helically wound around a support; and an outer jacket that is disposed on the plurality of cable sensors and surrounds the plurality of cable sensors; where each cable sensor comprises an optical fiber; where the optical fiber comprises an optical core upon which is disposed a cladding; a primary coating; a deformable material surrounding the optical fiber; and an outer tube surrounding the deformable material; where the optical fiber is of equal length to the outer tube; and where an allowable strain on the optical cable with zero stress on the optical fiber is determined by equations (1) and (2) below: ? = ? 2 ? ( D + d 2 ) 2 + p 2 p - ? 2 ? ( D - d 2 ) 2 + p 2 p = ? 2 ? dD p 2 = 10 ? ? dD p 2 ( 1 ) ? × 100 = Percent ? ? elongation ? ? or ? ? contraction ; ( 2 ) where d is the amount of optical fiber clearance for free movement

Abstract: 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.

Abstract: Embodiments are directed to a method and device for coupling an optical fiber sensing element to an apparatus under test. A channel is affixed to the apparatus under test. The channel is partially filled with a coupling material. The fiber optic sensing element is placed on the coupling material. Coupling material is placed in the channel to uniformly surround the fiber optic sensing element and tightly couple the fiber optic sensing element to the apparatus under test.

Abstract: 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.

Abstract: Disclosed herein is an optical cable comprising a plurality of cable sensors helically wound around a support; and an outer jacket that is disposed on the plurality of cable sensors and surrounds the plurality of cable sensors; where each cable sensor comprises an optical fiber; where the optical fiber comprises an optical core upon which is disposed a cladding; a primary coating; a deformable material surrounding the optical fiber; and an outer tube surrounding the deformable material; where the optical fiber is of equal length to the outer tube; and where an allowable strain on the optical cable with zero stress on the optical fiber is determined by equations (1) and (2) below: ? = ? 2 ? ( D + d 2 ) 2 + p 2 p - ? 2 ? ( D - d 2 ) 2 + p 2 p = ? 2 ? dD p 2 = 10 ? ? dD p 2 ( 1 ) ? × 100 = Percent ? ? elongation ? ? or ? ? contraction ; ( 2 ) where d is the amount of optical fiber clearance for free movement

Abstract: Embodiments are directed to a method and device for coupling an optical fiber sensing element to an apparatus under test. A channel is affixed to the apparatus under test. The channel is partially filled with a coupling material. The fiber optic sensing element is placed on the coupling material. Coupling material is placed in the channel to uniformly surround the fiber optic sensing element and tightly couple the fiber optic sensing element to the apparatus under test.