论文信息 - Long distance Φ-OTDR system based on Raman and EDFA synthetic amplification

Long distance Φ-OTDR system based on Raman and EDFA synthetic amplification

Comprehensive using of Raman amplifier and bi-directional Er-doped fiber amplifier (EDFA), a long distance (72.3 km) Φ-OTDR system is demonstrated. In this system, a LD laser (~500mw) with wavelength from 1420 nm to 1470 nm is used as both EDFA pump power and Raman pump power. Meanwhile, difference value of upper-envelope and lower-envelope of Rayleigh scattering trace is calculated to test the sensitivity of the system, the intrusion with SNR of 3.99 dB、8.59 dB at two test points of sensing fiber is extracted.

Meng Zhao | Yuan Yu | Xiaozhong Tian | Guohui Jiang

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