Author Affiliations
Abstract
1 Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan 030024, China
2 Institute of Optoelectronic Engineering, College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China
We propose and demonstrate a scheme to measure the distribution of temperature along an optical fiber based on pseudo-random sequence modulation. In our experimental work, current modulation with a pseudo-random bit sequence (PRBS) is applied to a laser diode that serves as the Brillouin pump light and reference light. Because of the independence of the spatial resolution on the PRBS length, the measurement range can be extended while maintaining high spatial resolution using a long PRBS length. Temperature-induced changes in a Brillouin frequency shift of 250 m fiber sections are clearly observed with 54 cm spatial resolution by this method.
060.2370 Fiber optics sensors 060.4080 Modulation 120.5820 Scattering measurements 290.5830 Scattering, Brillouin Chinese Optics Letters
2015, 13(8): 080604
Author Affiliations
Abstract
Department of Physics, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
The most general model of elliptical birefringence in an optical fiber is extended to describe a transient Brillouin interaction including both gain and loss. The effects of elliptical birefringence cause a Brillouin spectral shape distortion, which is detrimental for fiber sensing techniques. The model investigates the effects of birefringence and the corresponding evolution of spectral distortion effects along the fiber, and also investigates regimes where this distortion is minimal.
310.5448 Polarization, other optical properties 290.5900 Scattering, stimulated Brillouin 290.5830 Scattering, Brillouin 190.4370 Nonlinear optics, fibers Chinese Optics Letters
2014, 12(12): 123101
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
A high-precision temperature-controlled narrow band-stop fiber Bragg grating (FBG) filter and light source self-calibration technique are proposed for application in the Brillouin optical time domain reflectometer (BOTDR) sensor system. With the proposed application, the BOTDR sensor system maintains good long-term stability and temperature precision through the reduction of the center wavelength drift in the FBG filters and corresponding decrease in the changes in light intensity. The experiment result shows that temperature precision of 1°C and temperature stability of 0.7°C can be achieved in a temperature sensor over a range of 8 km.
290.5830 Scattering, Brillouin 060.2370 Fiber optics sensors 280.4788 Optical sensing and sensors 060.3735 Fiber Bragg gratings Collection Of theses on high power laser and plasma physics
2012, 10(1): 072901
Author Affiliations
Abstract
National Laboratory of High Power Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Shanghai 201800, China
A dual-source distributed optical fiber sensor system with combined Raman and Brillouin scatterings is designed for simultaneous temperature and strain measurements. The optimal Raman and Brillouin signals can be separately obtained by adjusting the powers of the two sources using an optical switch. The temperature and strain can be determined by processing the optimal Raman and Brillouin signals. The experimental result shows that 1.7 ℃ temperature resolution and 60-με" strain resolution can be achieved at a 24.7-km distance.
060.2370 Fiber optics sensors 290.5860 Scattering, Raman 290.5830 Scattering, Brillouin Collection Of theses on high power laser and plasma physics
2012, 10(1): 060601
Author Affiliations
Abstract
1 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
A high-precision temperature-controlled narrow band-stop fiber Bragg grating (FBG) filter and light source self-calibration technique are proposed for application in the Brillouin optical time domain reflectometer (BOTDR) sensor system. With the proposed application, the BOTDR sensor system maintains good long-term stability and temperature precision through the reduction of the center wavelength drift in the FBG filters and corresponding decrease in the changes in light intensity. The experiment result shows that temperature precision of 1°C and temperature stability of 0.7°C can be achieved in a temperature sensor over a range of 8 km.
290.5830 Scattering, Brillouin 060.2370 Fiber optics sensors 280.4788 Optical sensing and sensors 060.3735 Fiber Bragg gratings Chinese Optics Letters
2012, 10(7): 072901
Author Affiliations
Abstract
National Laboratory of High Power Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Shanghai 201800, China
A dual-source distributed optical fiber sensor system with combined Raman and Brillouin scatterings is designed for simultaneous temperature and strain measurements. The optimal Raman and Brillouin signals can be separately obtained by adjusting the powers of the two sources using an optical switch. The temperature and strain can be determined by processing the optimal Raman and Brillouin signals. The experimental result shows that 1.7 ℃ temperature resolution and 60-με" strain resolution can be achieved at a 24.7-km distance.
060.2370 Fiber optics sensors 290.5860 Scattering, Raman 290.5830 Scattering, Brillouin Chinese Optics Letters
2012, 10(6): 060601
Author Affiliations
Abstract
1 Key Laboratory of All-Optical Networks and Advanced Communication Networks, Ministry of Education, Beijing 100044, China
2 Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China
A new but simply implemented optical clock recovery scheme for optical time-division multiplexing (OTDM) systems based on stimulated Brillouin scattering (SBS) effect is presented and demonstrated experimentally. According to the unequal-amplitude even-multiplexed OTDM signals, the frame clock is extracted. In addition, the clock with multiple tributary rates is recovered from 160-Gb/s OTDM signal in simulation by utilizing the clock recovery module.
受激布里渊 时钟恢复 光时分复用 060.0060 Fiber optics and optical communications 060.2330 Fiber optics communications 290.0290 Scattering 290.5830 Scattering, Brillouin Chinese Optics Letters
2009, 7(8): 08683
Author Affiliations
Abstract
1 Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150001
2 Department of Applied Physics, Harbin University of Science and Technology, Harbin 150001
An approach of lidar measurements of ocean temperature through measuring the spectral linewidth of the backscattered Brillouin lines is presented. An empirical equation for the temperature as a function of Brillouin linewidth and salinity is derived. Theoretical results are in good agreement with the experimental data. The equation also reveals the dependence of the temperature on the salinity and Brillouin linewidth. It is shown that the uncertainty of the salinity has very little impact on the temperature measurement. The uncertainty of this temperature measurement methodology is approximately 0.02 Celsius degree.
290.5830 Scattering, Brillouin 280.3640 Lidar 120.6780 Temperature 290.3700 Linewidth Chinese Optics Letters
2006, 4(7): 428
