Polarization state monitoring device, polarization state monitoring method, and program

The polarization state monitoring device improves optical communication systems by calculating state points and change rates in Stokes space, addressing limitations in existing techniques to enhance accuracy and detect anomalies.

JP7865454B2Active Publication Date: 2026-05-26NEC CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NEC CORP
Filing Date
2023-04-27
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing techniques for monitoring the polarization state of optical signals in optical communication systems are limited in accuracy and efficiency, particularly in detecting changes and anomalies in polarization states.

Method used

A polarization state monitoring device and method that calculates state points in Stokes space, determines change amounts and rates using adaptive filtering, and selects calculation methods based on the magnitude of polarization state changes to improve accuracy.

Benefits of technology

Enhances the monitoring of polarization state changes with improved accuracy, enabling timely detection of anomalies and potential system malfunctions.

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Abstract

A polarization-state monitoring device (2000) identifies, for each of a plurality of partial periods included in a monitoring period, a state point, which is a point on a Stokes space indicating a polarization state of an optical reception signal (20) in the partial period. The polarization-state monitoring device (2000) calculates change amount data representing a magnitude of a change in the polarization state of the optical reception signal (20) for each of a plurality of pairs of the state points. The polarization-state monitoring device (2000) calculates change speed data representing a speed of the change in the polarization state of the optical reception signal (20). Here, the polarization-state monitoring device (2000) performs selection of a calculating method of the change speed data, changing of a length of the partial period, or changing of a length of an interval between the partial periods on the basis of a plurality of pieces of the change amount data.
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