| 摘要 |
PURPOSE:To prevent variance of the optical loss in an optical fiber to improve the precision of measurement by transmitting multiplexed lights with one optical fiber in wavelength multiplex and branching the exit light of the optical fiber to wavelengths of two vertical polarized components with a branching filter and subjecting them to photoelectric conversion. CONSTITUTION:One component of the light made incident to a polarizing beam splitter 17 is transmitted through the plane of polarization and a filter 21 as shown by a solid line and is converted to a prescribed wavelength and exit to a microlens 8. The other is reflected on the plane of polarization and strikes a reflective mirror 24 and is turned at 180 deg. as shown by a broken line. Meanwhile, the light made incident to a polarizing beam splitter 18 is converted to a prescribed wavelength by the filter 21, and one component is transmitted through the plane of polarization and exits to the lens 8. The other is reflected on the plane of polarization and is returned in the incidence direction. This light is branched to two vertical polarized components by an analyzer 25, and they are converted to wavelengths different from each other and are multiplexed in wavelength multiplex, and the multiplexed light is condensed by the lens 8 and is transmitted by one optical fibe 10 and is branched to two vertical polarized components by a branching filter 26, and they are subjected to photoelectric conversion by optical receivers 12 and 13. They are preocessed by an operator so that a ratio of the difference to the sum of these electric outputs is operated. |
