LOSS MEASURING METHOD FOR OPTICAL FIBER

PURPOSE:To speed up and simplify measuring operation while reducing the influence of an error due to temperature variation by shortening the time of each wavelength sweep by employing a multi-sampling system which uses a fast wavelength sweep type spectroscope. CONSTITUTION:Light having a continuous...

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Bibliographic Details
Main Authors NOGUCHI KAZUHIRO, UESUGI SUNAO, TANAKA CHIHAYA, SUZUKI KAZUNOBU
Format Patent
LanguageEnglish
Published 27.05.1987
Subjects
MEASURING
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
TESTING
TESTING STATIC OR DYNAMIC BALANCE OF MACHINES ORSTRUCTURES
TESTING STRUCTURES OR APPARATUS NOT OTHERWISE PROVIDED FOR
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Summary:PURPOSE:To speed up and simplify measuring operation while reducing the influence of an error due to temperature variation by shortening the time of each wavelength sweep by employing a multi-sampling system which uses a fast wavelength sweep type spectroscope. CONSTITUTION:Light having a continuous wavelength spectrum is projected from a continuous wavelength light source 8. This light is wavelength-swept by the fast wavelength sweep type spectroscope 9 at a high speed, light passed through the spectroscope 9 is coupled with one end of an optical fiber 10 to be measured, and light projected from the other end of the optical fiber 10 is coupled with a photodetector 11. A sampling device 13 begins to operate on the basis of a wavelength sweep start signal sent by the spectroscope 9, which sends out a wavelength marker signal to the device 13 the moment indicated wavelength coincides with wavelength to be measured. An electric signal obtained from a photodetector 11 is sampled at a high speed in a synchronism with the marker signal and electric signal outputs at respective sampling points are read in by an integral processor 14 and integrated to measure the loss of the optical fiber.
Bibliography:Application Number: JP19850253785