Patent ID: 11923897
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A device for estimating a state of optical communication, the device comprising:
a processor; and
a storage medium having computer program instructions stored thereon, when executed by the processor, perform to:
reduces the number of data using random sampling with respect to constellation data in which an amplitude and a phase of optical communication data are represented by a polar coordinate diagram and performs distribution calculation and a resolution reduction, thereby forming reduced constellation data;
learns a dictionary matrix in sparse coding using the reduced constellation data; and
calculates a sparse coefficient using the reduced constellation data and the dictionary matrix and estimates a factor causing degradation of the optical communication using the calculated sparse coefficient, where the factor is one of a phase error of bias in a modulator, an imbalanced state of I/O gain or an imbalanced state of I/O skew.