A distance measuring device

文件类型：PDF文档
文件大小：166K
PROBLEM TO BE SOLVED : To provide an optical fiber amplifier which can have its amplification factor varied in a short time at desired timing, an optical detection device, and a distance measurement device. SOLUTION : An optical fiber optical amplifier includes a first optical fiber which comprises an optical fiber including added rare earth, amplifies signal light made incident from one end of the optical fiber, and emits the amplified signal light from the other end of the optical fiber; a second optical fiber which comprises an optical fiber including added rare earth, and is coupled to the other end of the first optical fiber; an excitation light source which injects first excitation light into the second optical fiber, and a switch light source which makes switch light causing guide emission incident on the second optical fiber, and is equipped with an amplification excitation part which injects second excitation light guided and emitted from the second optical fiber by the incidence of the switch light into the first optical fiber. COPYRIGHT : (C)2013, JPO&INPIT