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US 2016/0109223 A1Published application
Distributed brillouin sensing using correlation
AssigneeNEC Laboratories America, Inc.
InventorsTing Wang, Yi Weng
Life of this patent
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Abstract
Methods and systems for sensing conditions of a fiber include splitting a light signal into two branches. A first branch is converted to have a mode different from that of the second branch. Both branches are mode multiplexed into a single fiber. An output of the fiber is mode demultiplexed into the two branches. The first branch is mode converted to its original mode. Brillouin scattering patterns of the two branches are compared to determine a temperature and strain profile of the fiber.
Claims12
A method for sensing conditions of a fiber, comprising:
- splitting a light signal into two branches;
- converting a first branch to have a mode different from that of the second branch;
- mode multiplexing both branches into a single fiber;
- mode demultiplexing an output of the fiber into the two branches;
- mode converting the first branch to its original mode;
- comparing Brillouin scattering patterns of the two branches to determine a temperature and strain profile of the fiber.
3 more elements
A sensor for sensing conditions of a fiber, comprising:
- a light source;
- a coupler configured to split an output of the light source into two branches;
- a mode converter configured to convert light in a first branch between a mode shared by the second branch and a different mode;
- a mode multiplexer configured to multiplex both branches onto a single fiber;
- a mode demultiplexer configured to demultiplex an output of the fiber into the two branches, with light on the first branch being passed to the mode converter for conversion back to the mode shred by the second branch;
- a processor configured to compare Brillouin scattering patterns of the two branches to determine a temperature and strain profile of the fiber.
3 more elements
Dependencies are inferred from the claim text.