CPC H04J 14/06 (2013.01) [H04B 10/2513 (2013.01); H04B 10/2572 (2013.01)] | 16 Claims |
1. An optical network device comprising:
a receiver configured to receive a polarization multiplexed optical signal transmitted from a transmitter node; and
a processor configured to
separate an electric-field-information signal indicating an electric field of the polarization multiplexed optical signal into a first polarization component and a second polarization component orthogonal to each other,
generate a third polarization component and a fourth polarization component orthogonal to each other by controlling the first polarization component and the second polarization component in a coordinate system indicating a first polarization direction and a second polarization direction orthogonal to each other,
calculate an evaluation value corresponding to at least either a power of the third polarization component or a power of the fourth polarization component for each of a plurality of positions on an optical transmission line between the transmitter node and the optical network device,
calculate, for each of the plurality of positions, a variation in the evaluation value that is associated with a control amount in the controlling, and
decide whether a first position among the plurality of positions is a position to be detected based on a result of comparing a variation in an evaluation value calculated for the first position with a variation in an evaluation value calculated for a second position adjacent to the first position among the plurality of positions.
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