Patent ID: 8879907

Claim:
A measurement apparatus, comprising: a transmitter disposed at a transmission-side node in an optical network and configured to transmit two pulsed lights with wavelengths different from each other at time intervals to a reception-side node in the optical network; a transmission controller configured to control the transmitter so as to transmit the two pulsed lights repeatedly while changing the time interval; a receiving unit disposed at the reception-side node and configured to receive the two pulsed lights from the transmitter via one or more relay nodes in the optical network; a detection unit configured to detect a change in an optical phase of at least one of the two pulsed lights received by the receiving unit; and a measurement unit configured to measure, based on the time interval and the change in an optical phase detected by the detection unit, a dispersion value of each transmission line between two nodes of nodes including the transmission-side node, the reception-side node, and the one or more relay nodes.