Bao Yuben, Sun Junqiang, Huang Qiang. Distributed Fiber Sensor Based on Brillouin Optical Time Domain Reflection Technique[J]. Laser & Optoelectronics Progress, 2020, 57(21): 210002
- Laser & Optoelectronics Progress
- Vol. 57, Issue 21, 210002 (2020)
Fig. 1. Schematic diagram of BOTDR
![Schematic diagram of BOTDR basic structure. (a) Direct detection; (b) local heterodyne detection; (c) microwave heterodyne detection; (d) self-heterodyne detection[16]](/richHtml/lop/2020/57/21/210002/img_2.jpg)
Fig. 2. Schematic diagram of BOTDR basic structure. (a) Direct detection; (b) local heterodyne detection; (c) microwave heterodyne detection; (d) self-heterodyne detection[16]
![Method for improving spatial resolution. (a) Double-pulse BOTDR[23]; (b) synthetic spectrum BOTDR[24]; (c) phase shift pulse BOTDR[25]; (d) differential pulse BOTDR[27]; (e) iterative subdivision method](/Images/icon/loading.gif){kind=icon}
Fig. 3. Method for improving spatial resolution. (a) Double-pulse BOTDR[23]; (b) synthetic spectrum BOTDR[24]; (c) phase shift pulse BOTDR[25]; (d) differential pulse BOTDR[27]; (e) iterative subdivision method
Fig. 4. Device improvement of BOTDR system. (a) Optical source; (b) modulator[39-40]; (c) frequency shifter; (d) depolarizer[41]; (e) detector
Fig. 5. Schematic diagram of BOTDR with in-line Raman amplification[52]
Fig. 6. Pulse coding. (a) Linear combination codes; (b) correlation codes
Fig. 7. Schematic diagram of hybrid Raman/Brillouin optical time domain reflectometer[81]
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