| 摘要 |
PURPOSE:To measure a polarized wave mode coupling, a transmission band, and a wavelength dispersion, etc. together with an optical loss, by using a variable wavelength light source, a Faraday rotary element and a polarized wave separating means, in an optical fiber measuring instrument for detecting a backscattering light beam. CONSTITUTION:A light beam which is outputted from a variable wavelength light source 11 rotates a polarized wave surface by a Faraday rotary element 13, and made incident on a fiber to be measured 3. A backscattering light beam goes back through the fiber 3, passes through the rotary element 13, and made incident on a polarized wave separating element 15 through a directional coupling element 2. In such an element, the incident light is separated into two orthogonal components, and detected by photodetecting parts 18, 19. Subsequently, by inputting this detecting signal to an operation controlling circuit 20 and executing a prescribed signal processing, a polarized wave mode coupling, a wavelength dispersion, a polarized wave dispersion, a loss, a transmission band characteristic, etc. which are running along the longitudinal direction of the optical fiber can be measured simultaneously. |
