| 摘要 |
<p>PURPOSE:To prevent an error caused by the wavelength dependency generated by a variation of an ambient temperature of an optical transmitter and to exactly execute the measurement by inserting an optical filter consisting of a narrow band filter between a photosensor part and an optical receiver. CONSTITUTION:An optical transmitter 1 is connected to a photosensor part consisting of a lens 3, a polarizer 4, a Faraday element 5, an analyzer 6 and a lens 7 through an optical fiber 2, and transmits a light beam. It is amplified by an amplifier 10 through an optical fiber 8, a narrow-band filter 15 and an optical receiver 9, and thereafter, one is connected to an integrator 11 and the other is connected to an amplifier 13 through a coupling capacitor 12, and outputs of both of them are outputted to a divider 14. In such a way, even if optical wavelength of its wave is varied by a variation of an ambient temperature of the optical transmitter 1, a light beam transmits through only some band by the optical filter 15, therefore, an error caused by the wavelength dependency is prevented, and the measurement can be executed exactly.</p> |
