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

Claim 9:
10. The DAS system based on the random laser amplification and the RSEF according to claim 1, comprising two high-order random laser amplification units, wherein one of the high-order random laser amplification units is connected with a front end of the RSEF, and the other one of the high-order random laser amplification unit is connected with a far end of the RSEF; the pulsed light output by the DAS demodulation unit is injected into the RSEF by the WDM; high-order random fiber lasings are output by two HRFLs into corresponding WDMs through corresponding adjustable attenuators, respectively, and is injected into the front end and the far end of the RSEF, respectively; when a power of the HRFL adjusted by the adjustable attenuator reaches a cascaded random fiber lasing threshold, the HRFL and the reflector form forward-and-backward-pumped structures, and a cascaded random fiber lasing is generated in the RSEF 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.