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

Claim 7:
8. The DAS system based on the random laser amplification and the RSEF according to claim 1, wherein the DAS demodulation unit, the high-order random laser amplification unit and the RSEF are connected in sequence, the DAS demodulation unit outputs the pulsed light, the pulsed light is injected into the RSEF by the WDM; the HRFL outputs the pump light into the WDM by the adjustable attenuator to be injected into 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 forward-pumped structure, and the cascaded random fiber lasings are generated in the scattering enhanced sensing fiber by the stimulated Raman scattering gain combined with the 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.