Water immersion detection device and water immersion detection method for detecting inundation of optical fiber
AssigneeNippon Telegraph and Telephone Corporation
InventorsKazutaka Noto, Nazuki Honda, Hiroyuki Oshida
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Abstract
An object of the present disclosure is to realize water immersion detection that does not require a replacement module, and does not cause any optical loss. The present disclosure relates to a device configured to measure guided acoustic wave Brillouin scattering in a measurement target optical fiber, and detect water immersion of the measurement target optical fiber based on a characteristic around a peak of the guided acoustic wave Brillouin scattering.
Claims9
A water immersion detection device comprising:
- a light source configured to emit test light to an optical fiber;
- a light detector configured to detect scattering light, the scattering light being generated by scattering the fest light by the optical fiber;
- and
- an analyzer configured to be programmed to:
- measure guided acoustic wave Brillouin scattering based on the detected scattering light;
- and
- detect a water immersion in the optical fiber based on a characteristic only around a first intensity peak of the measured guided acoustic wave Brillouin scattering,
- wherein the measured guided acoustic wave Brillouin scattering has a second intensity peak, and
- a first frequency of the first intensity peak is smaller than a second frequency of the second intensity peak.
A water immersion detection method for causing an analyzer to be programmed to execute a process, the water immersion detection method comprising executing on the analyzer the steps of:
- causing a light source to emit test light to an optical fiber;
- causing a light detector to detect scattering light, the scattering light being generated by scattering the fest light by the optical fiber;
- measuring guided acoustic wave Brillouin scattering based on the detected scattering light;
- and
- detecting a water immersion in the optical fiber based on a characteristic only around a first intensity peak of the measured guided acoustic wave Brillouin scattering
- wherein the measured guided acoustic wave Brillouin scattering has a second intensity peak, and
- a first frequency of the first intensity peak is smaller than a second frequency of the second intensity peak.
Dependencies are inferred from the claim text.