REDUNDANCY SYSTEM OF LIGHT SOURCE FOR PUMPING

摘要

PURPOSE:To manufacture the title redundancy system in high reliability without augmenting the output of a pumping light source by a method wherein an optical signal propagating in an amplifier medium is converted into electric signal so as to identify the interruption of the optical signal and then the first and second light sources of pumping light are converted from each other conforming to the interruption data. CONSTITUTION:The title redundancy system of the pumping light source exciting an optical signal 11 propagating in an amplifying medium 6 (Er doped quartz base optical fiber) of an optical fiber doped with an rare earth element is provided with the first pumping light source 7 and the second pumping light source 8 respectively and independently arranged on both ends of the said amplifying medium 6, a photo detector 12 to convert the said pumping light propagating in the amplifying medium 6 or the optical signal 11 into electric signal, an interruption identifier 13 identifying the interruption of the pumping light or optical signal 11 using the electric signal from the photodetector 12. Through these procedures, the first and the second pumping light sources 7, 8 are converted from each other conforming to the interruption data of the interruption identifier 13 so that the optical signal may be excited by the pumping light.