Optical signal-to-noise ratio estimation method

By inserting a zero-connected sequence into the optical signal frame structure and using the Burger algorithm to whiten noise, the problem of optical signal-to-noise ratio estimation accuracy caused by noise distortion in optical fiber links is solved, and high-precision OSNR estimation is achieved.

WO2026012249A1PCT designated stage Publication Date: 2026-01-15JOYWELL SEMICON (SHANGHAI) CO LTD
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Patent Information

Application Number
PCT/CN2025/106490
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-07-12
Filing Date
2025-07-01
Publication Date
2026-01-15

AI Technical Summary

Technical Problem

Existing technologies struggle to accurately separate signals and noise in fiber optic links, leading to a decrease in the accuracy of optical signal-to-noise ratio (OSNR) estimation, especially in complex networks and long-distance transmission where noise distortion is severe.

Method used

A sequence of consecutive zeros with a predetermined period is inserted into the frame structure of the optical signal sequence, and noise whitening is performed using the Burger algorithm to separate the signal and noise. The power of the noise and the effective load signal is calculated to estimate the optical signal-to-noise ratio.

Benefits of technology

It significantly improves the accuracy of optical signal-to-noise ratio estimation, with the error controlled within 0.5dB, reduces noise distortion, and is closer to the white noise in the actual link.

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Abstract

The present application relates to the technical field of optical communications. Disclosed is an optical signal-to-noise ratio (OSNR) estimation method. The method comprises: according to a predetermined period, inserting a predetermined number of consecutive-zero sequences into sub-frames of a frame structure of an optical signal sequence, and sending the optical signal sequence to a receiving end; the receiving end receiving the optical signal sequence, and determining whether the current sub-frame of the optical signal sequence comprises a consecutive-zero sequence; if the current sub-frame of the optical signal sequence comprises a consecutive-zero sequence, acquiring signals at the position of the consecutive-zero sequence in the sub-frame, and removing partial signals adjacent to other portions of the sub-frame from the acquired signals at the position of the consecutive-zero sequence, so as to obtain a noise sequence; using a Burg algorithm to perform noise whitening processing on the noise sequence, and calculating the power of the noise sequence that has been subjected to the noise whitening processing; if the current sub-frame of the optical signal sequence does not comprise a consecutive-zero sequence, selecting payload signals at partial positions in the sub-frame as effective payload signals, and calculating the power of the effective payload signals; and on the basis of the power of the noise sequence and the power of the effective payload signals, calculating an OSNR. The present invention reduces colored distortion imposed on noise during transmission, thereby significantly improving the accuracy of link OSNR estimation.
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Citation Information

Patent Citations

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  • Estimation method of optical signal-to-noise ratio

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  • Optical signal-to-noise ratio (OSNR) monitoring and measurement in optical communications systems

    US20180102842A1