Patent ID: 6839130

Claim:
An optical fiber measuring apparatus in which predetermined optical pulses are incident from one end of an optical fiber subject to measurement, and signal levels of return light thereof are detected to measure characteristics of said optical fiber, said optical fiber measuring apparatus comprising: optical-pulse generating section for generating predetermined optical pulses incident upon said optical fiber subject to measurement; optical-pulse input/output section to which the one end of said optical fiber subject to measurement is connected and which makes the optical pulses from said optical-pulse generating section incident upon said optical fiber and detects return light thereof, said optical-pulse input/output section being adapted to demultiplex the return light of the plurality of wavelengths scattered or reflected inside said optical fiber and output the same; a plurality of optical/electrical processing section for converting the light of the respective wavelengths from said optical-pulse input/output section into electrical signals and for amplifying the electrical signals; a plurality of signal processing section for sampling the signals of the respective wavelengths from said optical/electrical processing section and for effecting addition processing with respect to the sampled signals, so as to form waveforms expressing characteristics of the respective wavelengths; a plurality of clock generating section for generating sampling clocks corresponding to speeds of the return light of the respective wavelengths and supplying the sampling clocks to said signal processing section; and timing control section for supplying a first timing signal representing an optical-pulse generating timing to said optical-pulse generating section, and for supplying a second timing signal representing an addition processing timing to each of said signal processing section, said timing control section being adapted to generate the respective timing signals on the basis of a phase difference of the sampling clocks generated by said clock generating section.