Patent ID: 8818189
Filing Date: 2014-08-26
Classification: G01M,H04B,H04J

Abstract:
1. A transmission-path-type specifying apparatus comprising: an optical filter that extracts a plurality of different wavelength components from light including wavelength components occurring at the time of communication; a transmitter that simultaneously transmits a measurement signal and same pulse signals superposed on light of the wavelength components extracted by the optical filter; a modulation controller that obtains a delay-time difference among the pulse signals transmitted by the transmitter when arriving at a destination via a transmission path and a time required for the measurement signal transmitted by the transmitter to go and return through the transmission path via the destination; a calculator that calculates, based on the delay-time difference and the time for the measurement signal to go and return obtained by the modulation controller, a characteristic value of the transmission path corresponding to a reference time varied depending on a type of the transmission path; a determination circuit that specifies the type of the transmission path based on the characteristic value calculated by the calculator; and a dispersion-amount compensation circuit that decreases a dispersion amount of the wavelength components transmitted through the transmission path based on the type of the transmission path specified by the determination circuit.