Patent ID: 11874146
Assignee: ZHEJIANG LAB
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. The DAS system based on the random laser amplification and the RSEF according to claim 1, wherein the DAS demodulation unit, the RSEF and the high-order random laser amplification unit are connected in sequence, and the pulsed light output by the DAS demodulation unit is directly injected into the RSEF; the HRFL outputs high-order random lasing into the WDM by the adjustable attenuator to be injected into a far end of the RSEF; when a power of the HRFL adjusted by the adjustable attenuator reaches a cascaded random fiber lasing threshold, the HRFL and the reflector form a backward-pumped structure, and a cascaded random fiber lasing is generated in the scattering enhanced sensing fiber by stimulated Raman scattering gain combined with distributed backward feedback and point feedback provided by the reflector; a cascaded random fiber lasing in a wavelength band of 1420 nm-1490 nm is configured as a direct pump to perform distributed amplification on the pulsed light in a link of the RSEF, and the enhanced backscattered signal light generated by the amplified pulsed light returns to the DAS demodulation unit; and the DAS demodulation unit demodulates the enhanced backscattered signal light to implement long-distance distributed acoustic sensing.