TWO-CORE OPTICAL FIBERS FOR DISTRIBUTED FIBER SENSORS AND SYSTEMS
First Claim
1. A fiber sensor, comprising:
- an optical fiber having a first core, a second core, and a cladding surrounding the cores,wherein each core is configured to exhibit a Brillouin frequency shift of at least 30 Mhz relative to the other core.
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Abstract
A two-core optical fiber is provided for use in Brillouin distributed fiber sensor applications and systems. The two-core fiber includes a first and second core. Each core is configured to exhibit a Brillouin frequency shift greater than 30 Mhz relative to the other core. Further, each core possesses temperature and strain coefficients that differ from the other core. The cores can be configured to produce Brillouin frequency shift levels of at least 30 Mhz relative to one another. These differences in shift levels may be effected by adjustment of the material compositions, doping concentrations and/or refractive index profiles of each of the cores. These optical fibers may also be used in BOTDR- and BOTDA-based sensor systems and arrangements.
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Citations
20 Claims
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1. A fiber sensor, comprising:
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an optical fiber having a first core, a second core, and a cladding surrounding the cores, wherein each core is configured to exhibit a Brillouin frequency shift of at least 30 Mhz relative to the other core. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A Brillouin distributed fiber sensor system, comprising:
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an optical fiber having a first core and a second core, wherein each core is configured to exhibit a Brillouin frequency shift of at least 30 Mhz relative to the other core; at least one pump laser configured to launch test light into the optical fiber; and a receiver element configured to receive a Brillouin scattered component of test light from each core and evaluate the Brillouin frequency shift of each core based at least in part on the received test light. - View Dependent Claims (18)
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19. A Brillouin distributed fiber sensor system, comprising:
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an optical fiber having a first core and a second core, wherein each core is configured to exhibit a Brillouin frequency shift of at least 30 Mhz relative to the other core; at least one pump laser configured to launch pump test light into the optical fiber; at least one probe laser configured to launch probe test light into the optical fiber; and a receiver element configured to receive pump and probe test light from each core and evaluate the Brillouin frequency shift for each core based at least in part on the received test light. - View Dependent Claims (20)
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Specification