150 km fast BOTDA based on the optical chirp chain probe wave and Brillouin loss scheme

作者：Dong, Yongkang^*; Wang, Benzhang; Pang, Chao; Zhou, Dengwang; Ba, Dexin; Zhang, Hongying; Bao, Xiaoyi

来源：Optics Letters, 2018, 43(19): 4679-4682.

DOI：10.1364/OL.43.004679

• TIME-DOMAIN ANALYSIS
• ANALYSIS SENSOR
• AMPLIFICATION
• MODULATION
• RESOLUTION
• PULSES
• FIBERS
• RANGE

Distributed long-range Brillouin optical time domain analysis (BOTDA) is an extremely time-consuming sensing scheme, which requires frequency mapping of the Brillouin spectrum and a large number of average times. Here, we propose a fast long-range BOTDA based on the optical chirp chain (OCC) probe wave and Brillouin loss scheme. The OCC-modulated probe wave is enabled by cascading fast-frequency-changing microwave chirp segments head-to-tail, which covers a large frequency range around the anti-Stokes frequency relative to the pump wave. The combination of the OCC technique and Brillouin loss scheme provides several advantages, i.e., fast measurement, a high Brillouin threshold, no additional amplification scheme, and freedom from the nonlocal effect. In the experiment, 6 m spatial resolution, 3.2 s measurement time, and 3 MHz measurement precision were achieved over a 150 km single- mode fiber.

• 出版日期2018-10-1
• 单位哈尔滨学院; 哈尔滨工业大学