Optical fiber testing device

Abstract

Abstract PURPOSE:To utilize two polarized components in back scattered light and to obtain a testing device small in loss of signal light and long in trouble point search distance by photodetecting the outputs of the 1st and the 2nd polarization splits. CONSTITUTION:The light pulse output of a semiconductor laser 1 is guided to a polarization splitter 31 through a lens 21. At this time, a control circuit 13 does not drive a polarization plane converting element 4, so the output light is incident on a fiber 6 to be measured through the element 4, splitter 31, and a lens 22. Back scattered light generated in the fiber 6 is not polarized and passed through the lens 22, so that its vertical polarized component is incident on a photodetecting element 5 through the splitter 32 and lens 23. Its horizontal polarized component, on the other hand, travels straight in the polarization splitter 32 to enter the element 4. At this time, the element 4 is driven, so the horizontal polarized component turns to a vertical polarized component and enters a photodetecting element 52 through the splitter 31 and lens 24. The outputs of the elements 51 and 52 are amplified 91 and 92, then added 10 together and processed 11. Thus, the polarized component which is not used before is photodetected at the same time.

Inventors

• 👤 Muneki Ran
• 👤 蘭　宗樹

Bibliographic Details