testing technique of low insertion loss incorporated, the optical fiber identifier can definitely distinguish optical signals in fibers while service is going, and the fibers are not excessively pressed. At the time of installation, incision/fusion, maintenance and repair of optical fiber system as well as maintenance in equipment room, the identifier can be used to detect dull fibers, the direction of signal transmission in fibers, the fibers with the modulation signal (discriminate tone) and the intensity of optical signal or power display. The applicable optical fibers have such types as 250um/900um coated fibers and 2mm to 3mm pigtailed bridle wire
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