Transmission-path-type specifying apparatus and transmission-path-type specifying method

摘要

A transmission-path-type specifying apparatus includes an optical filter that extracts a plurality of different wavelength components from light including wavelength components occurring at the time of communication; an optical switch that simultaneously transmits same pulse signals superposed on light of the extracted wavelength components. The apparatus also includes an ASE modulation controlling unit that obtains a delay-time difference among the transmitted pulse signals when arriving at a destination via a transmission path; a characteristic-value calculating unit that calculates a characteristic value of the transmission path corresponding to a reference time varied depending on the obtained delay-time difference and a type of the transmission path; and a fiber-type determining unit that specifies the type of the transmission path based on the calculated characteristic value.

主权项

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.