Receiver used for burst-mode optical communication, frequency difference estimation program, and frequency difference estimation method

By integrating a burst phase difference detection unit and burst-unit clock frequency estimator, the receiver effectively addresses the challenge of estimating clock frequency differences in burst-mode optical communication systems with large frequency discrepancies, ensuring reliable synchronization.

JP2026026586APending Publication Date: 2026-02-18MITSUBISHI ELECTRIC CORP
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Patent Information

Application Number
JP2024128799
Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-08-05
Publication Date
2026-02-18

AI Technical Summary

Technical Problem

Existing receivers in burst-mode optical communication systems struggle to accurately estimate clock frequency differences when there is a large frequency discrepancy between transmitter and receiver clocks, especially when the burst signal is turned on intermittently, leading to difficulties in synchronization.

Method used

The receiver incorporates a burst phase difference detection unit and a burst-unit clock frequency difference estimator, which uses the burst-unit clock frequency difference as an initial value for symbol-unit clock frequency difference estimation, enabling continuous estimation even with low duty ratios.

Benefits of technology

This configuration allows for accurate estimation of clock frequency differences even with large frequency discrepancies and low burst signal activation, ensuring reliable synchronization in burst-mode optical communication systems.

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Abstract

To provide a receiver capable of estimating a clock frequency difference even when there is a large clock frequency difference between a transmitter and a receiver of a burst system optical communication system and a burst signal ON ratio is low.SOLUTION: The FPGA260 includes a burst-phase-difference detecting unit 267 that detects a burst phase difference φ from rising timing of a digital burst signal and assumed timing of a burst frame generated on the basis of a clock of a receiver clock source, a burst-unit-clock-frequency-difference estimating unit 268 that estimates a clock-frequency difference between a clock source of a sender and a clock source of a receiver as a burst unit clock-frequency difference using the burst phase difference φ, and a symbol-unit-clock-frequency-difference estimating unit 263 that estimates a clock-frequency difference using the estimated burst unit clock-frequency difference as an initial value of estimation processing for estimating a clock-frequency difference for a symbol included in a burst signal.SELECTED DRAWING: Figure 3
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