Measuring method of transmission loss of optical fiber

Abstract

Abstract PURPOSE:To enable accurate measurement with stable condition at all times, by measuring the power of light scattered and discharged externally at arbitrary two points of the optical fiber in the manufacturing process and measuring the transmission loss between the two points through the comparison of the both. CONSTITUTION:In manufacturing the optical fiber 3, the light of the liquid source 6 is incident from the base of the priohm rod 1 to deliver it to the fiber 3, and the powers Ps, Ps' of the scattered light scattered and discharged from the fiber 3 to external part are respectively measured at the photo detectors 7, 7' in the fine domain dZ, dZ' at the arbitray two points Z, Z' of the fiber 3. Further, each measuring output is compared with the ratio meter 8 to obtain the ratio Ps'/Ps. This is converted in logarithm at the converter 9 and it is multiplied by -10 and recorded in the recorder 10 as transmission loss a.

Inventors

• 👤 Yoshikazu Matsuda

Bibliographic Details