Low-crosstalk long-distance sensing integrated device and very low frequency sensing method

By using a low-crosstalk long-distance sensing integrated device and a very low frequency sensing method, the crosstalk problem between communication and sensing signals in the fiber optic sensing integrated system was solved, realizing efficient long-distance sensing and high-capacity communication, and improving the system's adaptability and feasibility in scenarios such as submarine optical cable monitoring.

CN121966720APending Publication Date: 2026-05-01HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202610136140.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-30
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing fiber optic sensing integrated systems suffer from severe crosstalk between communication and sensing signals, short effective sensing distance, and insufficient detection capability for very low frequency vibration signals.

Method used

The device employs a low-crosstalk, long-distance integrated sensing device, including a laser, coupler, modulation device, fiber optic transmission and relay link, receiving device, and signal processing device. Through digital subcarrier multiplexing technology, cascaded modulator design, bidirectional amplification relay module, and sensing signal processing algorithm, it achieves independent modulation and multiplexing of communication and sensing signals, suppresses crosstalk, and extends the sensing distance.

Benefits of technology

It achieves low crosstalk, high-efficiency transmission and high-sensitivity very low frequency vibration detection within the same wavelength channel, improves the system's communication capacity and spectrum utilization, and extends the effective sensing distance to the hundreds of kilometers level, making it suitable for long-distance monitoring scenarios.

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Abstract

The invention discloses a low-crosstalk long-distance sensing integrated device and a very-low-frequency sensing method, and relates to the technical field of fusion of optical fiber sensing and optical fiber communication. The device comprises a laser, a coupler, a communication modulation device, a sensing modulation device, an optical fiber transmission and relay link, a communication receiving device, a sensing receiving device and a signal processing device. The communication modulation device adopts digital subcarrier multiplexing and reserves a guard interval in a frequency spectrum center, and residual carrier filtering is combined to reduce the inductance crosstalk; the sensing modulation device realizes high-extinction-ratio pulses through a cascade light modulator, and the signal-to-noise ratio is improved. The optical fiber link adopts a bidirectional amplification relay module to synchronously amplify forward and backward signals so as to realize ultra-long distance transmission. The signal processing device carries out high-density sampling and space-time dimension fusion on the sensing beat frequency signals, and very low frequency vibration information is effectively extracted. According to the invention, common-light-source, low-crosstalk, long-distance, very-low-frequency and high-sensitivity integrated transmission and detection of communication and sensing signals are realized.
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