Coherent optical measuring device for facility line test
AssigneeNTT, Inc.
InventorsDaisuke Iida, Yoshitaka Enomoto, Chihiro Kito, Tatsuya Okamoto, Yusuke Koshikiya, Yoshifumi Wakisaka, Nazuki Honda
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Abstract
The present disclosure is an optical line test system that detects a distribution of loss points of an optical line in a longitudinal direction, using a coherent light measurement device, applies vibration to facility disposed on a path of the optical line, detects a vibration point of the optical line in a longitudinal direction upon applying the vibration, using the coherent light measurement device, and identifies the loss point based on correspondence between the detected loss point and vibration point.
Claims8
An optical line test system comprising:
- detecting a distribution of possible loss points of an optical line in a longitudinal direction, using a coherent light measurement device;
- applying vibration to facility disposed on a path of the optical line;
- detecting a vibration point of the optical line in a longitudinal direction upon applying the vibration, using the coherent light measurement device;
- comparing the vibration point to the distribution of possible loss points;
- and
- identifying the loss point based on correspondence between the vibration point and the distribution of possible loss points.
A coherent light measurement device that is a coherent OTDR for performing coherent detection, the device for
- measuring a distribution of possible loss points by time-averaging a plurality of backscattered light waveforms obtained by a plurality of light pulses,
- measuring the vibration point by arranging the plurality of backscattered light waveforms obtained by the plurality of light pulses in accordance with time series,
- comparing the vibration point to the distribution of possible loss points;
- and
- determining whether the distribution of possible loss points and the vibration point correspond or do not correspond.
An optical line test method comprising:
- detecting a distribution of possible loss points of an optical line in a longitudinal direction, using a coherent light measurement device;
- applying vibration to facility disposed on a path of the optical line;
- detecting a vibration point of the optical line in a longitudinal direction upon applying the vibration, using the coherent light measurement device;
- comparing the vibration point to the distribution of possible loss points;
- and
- identifying the loss point based on correspondence between the the vibration point and the distribution of possible loss points.
Dependencies are inferred from the claim text.