Technique for analyzing a spectrum of backscattered light in an optical fiber
AssigneeNippon Telegraph and Telephone Corporation
InventorsTatsuya Okamoto, Daisuke Iida, Yusuke Koshikiya, Nazuki Honda
Life of this patent
Estimating the term…
Abstract
The present disclosure generates an optical spectrogram, representing a temporal change in frequency characteristics, using a plurality of spectral data measured by an OFDR measurement instrument at different times, and filters the optical spectrogram in both a time direction and a frequency direction.
Claims7
An analysis device that generates an optical spectrogram, representing a temporal change in frequency characteristics, using a plurality of spectral data measured by an OFDR measurement instrument at different times, and filters the optical spectrogram in both a time direction and a frequency direction, wherein a width Δv of filtering in the frequency direction is smaller than a frequency resolution of the OFDR measurement instrument.
A measurement method comprising:
- acquiring a plurality of spectral data by measuring backscattered light with an OFDR measurement instrument at different times;
- generating an optical spectrogram, representing a temporal change in frequency characteristics, using the plurality of spectral data;
- and
- filtering the optical spectrogram in both a time direction and a frequency direction, wherein a width Δv of filtering in the frequency direction is smaller than a frequency resolution of the OFDR measurement instrument.
Dependencies are inferred from the claim text.