Distributed optical fiber sensor with controlled response
AssigneeOptech Ventures, LLC
InventorsRobert A. Lieberman, Claudio O. Egalon
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Abstract
Distributed fiber optic chemical and physical sensors provide a relatively highly uniform response over the length of the fiber by, for example, varying such properties as the core/cladding index of refraction ratio to compensate for the non-linearity in sensitivity due for example to the loss of higher order modes in multi-mode fibers. The variation of the ratio changes the absorption coefficient of the fiber and can be used to compensate for any non-linearity in response. Other techniques for compensation also are disclosed.
Claims8
An optical fiber, said fiber being a multi-mode single core fiber and having a core and sheath, said fiber having at least one parameter that varies from an input end of said fiber to an output end thereof in a manner to maintain a constant power loss per unit length over the length of said fiber.
An optical fiber, said fiber being a multi-mode single core fiber and having a core and a cladding, said cladding being fabricated to be sensitive to a physical quantity, said fiber having at least one parameter that varies from an input end to an output end in a way calculated to make the power loss vary in a controlled way over the length of the fiber.
Dependencies are inferred from the claim text.