南京邮电大学电子与光学工程学院先进光子技术实验室，江苏 南京 210023
设计出一种宽带、频率间隔可切换的多波长布里渊随机光纤激光器。该激光器具有双开腔结构，通过调节前、后向布里渊泵浦功率比，可以实现输出多波长激光在单倍与双倍布里渊频移间隔之间切换。结果显示，当拉曼泵浦功率设置为831.8 mW时，得到了44.5 nm(1528～1572.5 nm)输出带宽内共253阶双倍频移间隔(～0.176 nm)的斯托克斯线，以及42.5 nm(1532～1574.5 nm)输出带宽内共483阶单倍频移间隔(～0.088 nm)的斯托克斯线。频率间隔可切换多波长布里渊随机光纤激光器有望拓宽多波长激光器在光通信和传感等领域的应用范围。
激光器 随机激光 频率间隔可切换 受激布里渊散射 中国激光
2022, 49(11): 1101003
Author Affiliations
Abstract
1 School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2 Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
3 School of Electrical Engineering & Telecommunications, University of New South Wales, NSW 2052, Australia
We propose a new non-intrusive flow measurement method using the distributed feedback fiber laser (DFB-FL) as a sensor to monitor flow in the pipe. The relationship between the wavelength of the DFB-FL and the liquid flow rate in the pipeline is derived. Under the guidance of this theory, the design and test of the flow sensor is completed. The response curve is relatively flat in the frequency range of 10 Hz to 500 Hz, and the response of the flow sensor has high linearity. The flow from 0.6 m3/h to 25.5 m3/h is accurately measured under the energy analysis method in different frequency intervals. A minimum flow rate of 0.046 m/s is achieved. The experimental results demonstrate the feasibility of the new non-intrusive flow measurement method based on the DFB-FL and accurate measurement of small flow rates.
DFB-FL flow non-intrusive measurement energy analysis frequency interval Chinese Optics Letters
2020, 18(2): 021204
