The Experts below are selected from a list of 23835 Experts worldwide ranked by ideXlab platform
Oh-Jang Kwon - One of the best experts on this subject based on the ideXlab platform.
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long Distance Fiber bragg grating strain sensor interrogation using a high speed raman based fourier domain mode locked Fiber laser with recycled residual raman pump
Optics Express, 2013Co-Authors: Oh-Jang KwonAbstract:We propose a novel Fiber Bragg grating (FBG) sensor interrogation using a Raman-based Fourier-domain mode locking (FDML) Fiber laser for a high speed and long Distance measurement. A residual Raman pump after the generation of the Raman-based FDML Fiber laser is recycled for secondary signal amplification in a 2-m erbium-doped Fiber (EDF) to further enhance the output power. The chromatic dispersion is precisely controlled to suppress the phase noise in the FDML laser cavity, resulting in the improvement of an R-number of 1.43 mm/dB. After recycling residual pump, we achieve the 40-km round trip transmission of the sensing probe signal with a high scan rate of 30.8 kHz. With 205-mW residual pump power, the bandwidth and the maximum gain are measured to be more than 50 nm, 10.3 dB at 1550 nm, respectively. The sensitivity of the proposed Raman-based FDML Fiber laser to strain is also measured, which are 0.81 pm/μstrain in the spectral domain and 0.19 ns/μstrain in the time domain, respectively.
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long Distance Fiber bragg grating strain sensor interrogation using a high speed raman based fourier domain mode locked Fiber laser with recycled residual raman pump
Optics Express, 2013Co-Authors: Oh-Jang KwonAbstract:We propose a novel Fiber Bragg grating (FBG) sensor interrogation using a Raman-based Fourier-domain mode locking (FDML) Fiber laser for a high speed and long Distance measurement. A residual Raman pump after the generation of the Raman-based FDML Fiber laser is recycled for secondary signal amplification in a 2-m erbium-doped Fiber (EDF) to further enhance the output power. The chromatic dispersion is precisely controlled to suppress the phase noise in the FDML laser cavity, resulting in the improvement of an R-number of 1.43 mm/dB. After recycling residual pump, we achieve the 40-km round trip transmission of the sensing probe signal with a high scan rate of 30.8 kHz. With 205-mW residual pump power, the bandwidth and the maximum gain are measured to be more than 50 nm, 10.3 dB at 1550 nm, respectively. The sensitivity of the proposed Raman-based FDML Fiber laser to strain is also measured, which are 0.81 pm/μstrain in the spectral domain and 0.19 ns/μstrain in the time domain, respectively.
Rongrui Chen - One of the best experts on this subject based on the ideXlab platform.
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long Distance Fiber bragg grating sensor system with a high optical signal to noise ratio based on a tunable Fiber ring laser configuration
Optics Letters, 2006Co-Authors: Y J Rao, Zengling Ran, Rongrui ChenAbstract:A novel tunable Fiber ring laser configuration with a combination of bidirectional Raman amplification and dual erbium-doped Fiber (EDF) amplification is proposed for realizing high optical signal-to-noise ratio (SNR), long-Distance, quasi-distributed Fiber Bragg grating (FBG) sensing systems with large capacities and low cost. The hybrid Raman-EDF amplification configuration arranged in the ring laser can enhance the optical SNR of FBG sensor signals significantly owing to the good combination of the high gain of the erbium-doped Fiber amplifier (EDFA) and the low noise of the Raman amplification. Such a sensing system can support a large number of FBG sensors because of the use of a tunable Fiber Fabry-Perot filter located within the ring laser and spatial division multiplexing for expansion of sensor channels. Experimental results show that an excellent optical SNR of ∼60 dB has been achieved for a 50 km transmission Distance with a low Raman pump power of ∼170 mW at a wavelength of 1455 nm and a low EDFA pump power of ∼40 mW at a wavelength of 980 nm, which is the highest optical SNR achieved so far for a 50 km long FBG sensor system, to our knowledge.
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long Distance Fiber bragg grating sensor system with a high optical signal to noise ratio based on a tunable Fiber ring laser configuration
Optics Letters, 2006Co-Authors: Yunjiang Rao, Zengling Ran, Rongrui ChenAbstract:A novel tunable Fiber ring laser configuration with a combination of bidirectional Raman amplification and dual erbium-doped Fiber (EDF) amplification is proposed for realizing high optical signal-to-noise ratio (SNR), long-Distance, quasi-distributed Fiber Bragg grating (FBG) sensing systems with large capacities and low cost. The hybrid Raman-EDF amplification configuration arranged in the ring laser can enhance the optical SNR of FBG sensor signals significantly owing to the good combination of the high gain of the erbium-doped Fiber amplifier (EDFA) and the low noise of the Raman amplification. Such a sensing system can support a large number of FBG sensors because of the use of a tunable Fiber Fabry-Perot filter located within the ring laser and spatial division multiplexing for expansion of sensor channels. Experimental results show that an excellent optical SNR of approximately 60 dB has been achieved for a 50 km transmission Distance with a low Raman pump power of approximately 170 mW at a wavelength of 1455 nm and a low EDFA pump power of approximately 40 mW at a wavelength of 980 nm, which is the highest optical SNR achieved so far for a 50 km long FBG sensor system, to our knowledge.
Yunjiang Rao - One of the best experts on this subject based on the ideXlab platform.
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long Distance Fiber optic point sensing systems based on random Fiber lasers
Optics Express, 2012Co-Authors: Zinan Wang, Yunjiang Rao, Yao Jiang, Xinhong Jia, Weili ZhangAbstract:We find that the random Fiber laser (RFL) without point-reflectors is a temperature-insensitive distributed lasing system for the first time. Inspired by such thermal stability, we propose the novel concept of utilizing the RFL to achieve long-Distance Fiber-optic remote sensing, in which the RFL offers high-fidelity and long-Distance transmission for the sensing signal. Two 100km Fiber Bragg grating (FBG) point-sensing schemes based on RFLs are experimentally demonstrated using the first-order and the second-order random lasing, respectively, to verify the concept. Each sensing scheme can achieve >20dB optical signal-to-noise ratio (OSNR) over 100km Distance. It is found that the second-order random lasing scheme has much better OSNR than that of the first-order random lasing scheme due to enhanced lasing efficiency, by incorporating a 1455nm FBG into the lasing cavity.
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long Distance Fiber optic φ otdr intrusion sensing system
20th International Conference on Optical Fibre Sensors, 2009Co-Authors: Yunjiang Rao, Jun Luo, Zengling Ran, Jianfeng Yue, Xiaodong Luo, Zhi ZhouAbstract:A novel Fiber-optic phase-sensitive optical time-domain reflectometer (Φ-OTDR) distributed sensing system is proposed and demonstrated for long-Distance intrusion monitoring. By using the bi-directional Raman optical amplification technology, even intrusion signal detection along the whole sensing Distance of ~62km has been demonstrated, resulting in the longest and the most sensitive Φ -OTDR distributed sensing system reported so far, to the best of our knowledge. In addition, high-power single-mode Fiber laser with ultra-narrow line-width and special optical Fiber cable encapsulated by Fiber reinforced plastic (FRP) are used to further enhance the intrusion detection sensitivity, respectively.
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long Distance Fiber bragg grating sensor system with a high optical signal to noise ratio based on a tunable Fiber ring laser configuration
Optics Letters, 2006Co-Authors: Yunjiang Rao, Zengling Ran, Rongrui ChenAbstract:A novel tunable Fiber ring laser configuration with a combination of bidirectional Raman amplification and dual erbium-doped Fiber (EDF) amplification is proposed for realizing high optical signal-to-noise ratio (SNR), long-Distance, quasi-distributed Fiber Bragg grating (FBG) sensing systems with large capacities and low cost. The hybrid Raman-EDF amplification configuration arranged in the ring laser can enhance the optical SNR of FBG sensor signals significantly owing to the good combination of the high gain of the erbium-doped Fiber amplifier (EDFA) and the low noise of the Raman amplification. Such a sensing system can support a large number of FBG sensors because of the use of a tunable Fiber Fabry-Perot filter located within the ring laser and spatial division multiplexing for expansion of sensor channels. Experimental results show that an excellent optical SNR of approximately 60 dB has been achieved for a 50 km transmission Distance with a low Raman pump power of approximately 170 mW at a wavelength of 1455 nm and a low EDFA pump power of approximately 40 mW at a wavelength of 980 nm, which is the highest optical SNR achieved so far for a 50 km long FBG sensor system, to our knowledge.
Zengling Ran - One of the best experts on this subject based on the ideXlab platform.
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long Distance Fiber optic φ otdr intrusion sensing system
20th International Conference on Optical Fibre Sensors, 2009Co-Authors: Yunjiang Rao, Jun Luo, Zengling Ran, Jianfeng Yue, Xiaodong Luo, Zhi ZhouAbstract:A novel Fiber-optic phase-sensitive optical time-domain reflectometer (Φ-OTDR) distributed sensing system is proposed and demonstrated for long-Distance intrusion monitoring. By using the bi-directional Raman optical amplification technology, even intrusion signal detection along the whole sensing Distance of ~62km has been demonstrated, resulting in the longest and the most sensitive Φ -OTDR distributed sensing system reported so far, to the best of our knowledge. In addition, high-power single-mode Fiber laser with ultra-narrow line-width and special optical Fiber cable encapsulated by Fiber reinforced plastic (FRP) are used to further enhance the intrusion detection sensitivity, respectively.
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long Distance Fiber bragg grating sensor system with a high optical signal to noise ratio based on a tunable Fiber ring laser configuration
Optics Letters, 2006Co-Authors: Y J Rao, Zengling Ran, Rongrui ChenAbstract:A novel tunable Fiber ring laser configuration with a combination of bidirectional Raman amplification and dual erbium-doped Fiber (EDF) amplification is proposed for realizing high optical signal-to-noise ratio (SNR), long-Distance, quasi-distributed Fiber Bragg grating (FBG) sensing systems with large capacities and low cost. The hybrid Raman-EDF amplification configuration arranged in the ring laser can enhance the optical SNR of FBG sensor signals significantly owing to the good combination of the high gain of the erbium-doped Fiber amplifier (EDFA) and the low noise of the Raman amplification. Such a sensing system can support a large number of FBG sensors because of the use of a tunable Fiber Fabry-Perot filter located within the ring laser and spatial division multiplexing for expansion of sensor channels. Experimental results show that an excellent optical SNR of ∼60 dB has been achieved for a 50 km transmission Distance with a low Raman pump power of ∼170 mW at a wavelength of 1455 nm and a low EDFA pump power of ∼40 mW at a wavelength of 980 nm, which is the highest optical SNR achieved so far for a 50 km long FBG sensor system, to our knowledge.
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long Distance Fiber bragg grating sensor system with a high optical signal to noise ratio based on a tunable Fiber ring laser configuration
Optics Letters, 2006Co-Authors: Yunjiang Rao, Zengling Ran, Rongrui ChenAbstract:A novel tunable Fiber ring laser configuration with a combination of bidirectional Raman amplification and dual erbium-doped Fiber (EDF) amplification is proposed for realizing high optical signal-to-noise ratio (SNR), long-Distance, quasi-distributed Fiber Bragg grating (FBG) sensing systems with large capacities and low cost. The hybrid Raman-EDF amplification configuration arranged in the ring laser can enhance the optical SNR of FBG sensor signals significantly owing to the good combination of the high gain of the erbium-doped Fiber amplifier (EDFA) and the low noise of the Raman amplification. Such a sensing system can support a large number of FBG sensors because of the use of a tunable Fiber Fabry-Perot filter located within the ring laser and spatial division multiplexing for expansion of sensor channels. Experimental results show that an excellent optical SNR of approximately 60 dB has been achieved for a 50 km transmission Distance with a low Raman pump power of approximately 170 mW at a wavelength of 1455 nm and a low EDFA pump power of approximately 40 mW at a wavelength of 980 nm, which is the highest optical SNR achieved so far for a 50 km long FBG sensor system, to our knowledge.
C. Yu - One of the best experts on this subject based on the ideXlab platform.
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100-km Long Distance Fiber Bragg Grating Sensor System Based on Erbium-Doped Fiber and Raman Amplification
IEEE Photonics Technology Letters, 2010Co-Authors: Junhao Hu, Zhihao Chen, Junhong Ng, Xiufeng Yang, C. YuAbstract:A simple 100-km long Distance Fiber Bragg grating sensor system was proposed and demonstrated. It can achieve 100-km measurement length with reflected Bragg wavelength spectrum of 30 dB signal noise ratio by using only one Raman pump laser source with 1 W power at 1395 nm and two segments of erbium-doped Fiber at the locations of 50 and 75 km separately.