The Experts below are selected from a list of 2085 Experts worldwide ranked by ideXlab platform
C. Yu - One of the best experts on this subject based on the ideXlab platform.
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Long-distance fiber sensor system based on the second-order Raman Pump and amplification
Applied Physics B, 2012Co-Authors: B. Dong, Jun Hu, Z Chen, C. YuAbstract:We demonstrate a novel technique to realize a long-distance fiber sensor system based on the second-order Raman Pump and amplification. With the second-order Raman Pump and amplification, a gain spectrum around 1582-nm is achieved. It serves as not only the optical source for the remote fiber sensor but also the filter to intensity modulated the wavelength shift of the fiber sensor. A long-distance fiber strain sensor system is demonstrated by adopting a fiber Fabry–Perot sensor. Experimental results show that the wavelength shift of the sensor in response to the strain is simultaneously intensity modulated by the steep slope with a high sensitivity, while it is temperature insensitive. With the side gain spectrum served as a quasi-linear filter, the sensor can also be quasi-linearly intensity-modulated.
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Long-distance fiber sensor system based on the second-order Raman Pump and amplification
Applied Physics B: Lasers and Optics, 2012Co-Authors: B. Dong, Jun Hu, Z Chen, C. YuAbstract:We demonstrate a novel technique to realize a long-distance fiber sensor system based on the second-order Raman Pump and amplification. With the second-order Raman Pump and amplification, a gain spectrum around 1582-nm is achieved. It serves as not only the optical source for the remote fiber sensor but also the filter to intensity modulated the wavelength shift of the fiber sensor. A long-distance fiber strain sensor system is demonstrated by adopting a fiber Fabry-P,rot sensor. Experimental results show that the wavelength shift of the sensor in response to the strain is simultaneously intensity modulated by the steep slope with a high sensitivity, while it is temperature insensitive. With the side gain spectrum served as a quasi-linear filter, the sensor can also be quasi-linearly intensity-modulated.
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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, Xiufeng Yang, Junhong Ng, 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.
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Long distance fiber bragg grating sensor system based on erbium-doped fiber and Raman amplification
2009 Asia Communications and Photonics conference and Exhibition (ACP), 2009Co-Authors: Junhao Hu, Zhihao Chen, Xiufeng Yang, Junhong Ng, C. YuAbstract:A novel simple long distance FBG sensor system is proposed and demonstrated. It can easily achieve 45dB SNR after transmitting along a 50km single mode fiber (SMF) by using only one 1W Raman Pump laser source at 1395nm and a segment of 5m EDF.
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: Sunduck Kim, HYEONG SEOK LEE, Oh-Jang Kwon, Chang-seok Kim, Young-geun HanAbstract: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. © 2013 Optical Society of America.
Haeyang Chung - One of the best experts on this subject based on the ideXlab platform.
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Dispersion-compensating Raman/EDFA hybrid amplifier recycling residual Raman Pump for efficiency enhancement
IEEE Photonics Technology Letters, 2020Co-Authors: You Min Chang, Haeyang ChungAbstract:We experimentally demonstrate a novel concept of the dispersion-compensating Raman/erbium-doped fiber amplifier hybrid amplifier recycling residual Raman Pump for increase of overall power conversion efficiency. The proposed dispersion-compensating hybrid amplifier system has only one Pump source for Raman amplification in the dispersion-compensating fiber (DCF) and the residual Pump power after the DCF is recycled for secondary signal amplification in an erbium-doped fiber cascaded to the DCF. Using the proposed scheme, we achieve the significant enhancement of both signal gain and effective gain-bandwidth by 15 dB (small signal gain) and 20 nm, respectively, compared to the performance of the Raman-only amplifier.
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Raman amplifier-based long-distance temperature/strain sensing system incorporating a combined sensing probe of an FBG and an EFG recyling residual Raman Pump
17th International Conference on Optical Fibre Sensors, 2005Co-Authors: You Min Chang, Haeyang ChungAbstract:A novel, Raman amplifier-based long-distance sensing system using a combined sensing probe of an erbium-doped fiber (EDF) and a fiber Bragg grating is proposed for simultaneous measurement of temperature and strain. By recycling residual Raman Pump power for generation of amplified spontaneous emission in the EDF after distributed Raman amplification in the transmission fiber, the overall system configuration was significantly simplified without requiring any additional broadband light source. A remote sensing operation of simultaneous temperature and strain measurement is obtained at a location of 50 km. High quality of sensing signals with a ~ 11 dB signal-to-noise ratio (SNR) is readily achieved even after the 50 km transmission with distributed Raman amplification.
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dispersion compensating Raman edfa hybrid amplifier recycling residual Raman Pump for efficiency enhancement
IEEE Photonics Technology Letters, 2005Co-Authors: You Min Chang, Haeyang ChungAbstract:We experimentally demonstrate a novel concept of the dispersion-compensating Raman/erbium-doped fiber amplifier hybrid amplifier recycling residual Raman Pump for increase of overall power conversion efficiency. The proposed dispersion-compensating hybrid amplifier system has only one Pump source for Raman amplification in the dispersion-compensating fiber (DCF) and the residual Pump power after the DCF is recycled for secondary signal amplification in an erbium-doped fiber cascaded to the DCF. Using the proposed scheme, we achieve the significant enhancement of both signal gain and effective gain-bandwidth by 15 dB (small signal gain) and 20 nm, respectively, compared to the performance of the Raman-only amplifier.
You Min Chang - One of the best experts on this subject based on the ideXlab platform.
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Dispersion-compensating Raman/EDFA hybrid amplifier recycling residual Raman Pump for efficiency enhancement
IEEE Photonics Technology Letters, 2020Co-Authors: You Min Chang, Haeyang ChungAbstract:We experimentally demonstrate a novel concept of the dispersion-compensating Raman/erbium-doped fiber amplifier hybrid amplifier recycling residual Raman Pump for increase of overall power conversion efficiency. The proposed dispersion-compensating hybrid amplifier system has only one Pump source for Raman amplification in the dispersion-compensating fiber (DCF) and the residual Pump power after the DCF is recycled for secondary signal amplification in an erbium-doped fiber cascaded to the DCF. Using the proposed scheme, we achieve the significant enhancement of both signal gain and effective gain-bandwidth by 15 dB (small signal gain) and 20 nm, respectively, compared to the performance of the Raman-only amplifier.
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Raman amplifier-based long-distance temperature/strain sensing system incorporating a combined sensing probe of an FBG and an EFG recyling residual Raman Pump
17th International Conference on Optical Fibre Sensors, 2005Co-Authors: You Min Chang, Haeyang ChungAbstract:A novel, Raman amplifier-based long-distance sensing system using a combined sensing probe of an erbium-doped fiber (EDF) and a fiber Bragg grating is proposed for simultaneous measurement of temperature and strain. By recycling residual Raman Pump power for generation of amplified spontaneous emission in the EDF after distributed Raman amplification in the transmission fiber, the overall system configuration was significantly simplified without requiring any additional broadband light source. A remote sensing operation of simultaneous temperature and strain measurement is obtained at a location of 50 km. High quality of sensing signals with a ~ 11 dB signal-to-noise ratio (SNR) is readily achieved even after the 50 km transmission with distributed Raman amplification.
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dispersion compensating Raman edfa hybrid amplifier recycling residual Raman Pump for efficiency enhancement
IEEE Photonics Technology Letters, 2005Co-Authors: You Min Chang, Haeyang ChungAbstract:We experimentally demonstrate a novel concept of the dispersion-compensating Raman/erbium-doped fiber amplifier hybrid amplifier recycling residual Raman Pump for increase of overall power conversion efficiency. The proposed dispersion-compensating hybrid amplifier system has only one Pump source for Raman amplification in the dispersion-compensating fiber (DCF) and the residual Pump power after the DCF is recycled for secondary signal amplification in an erbium-doped fiber cascaded to the DCF. Using the proposed scheme, we achieve the significant enhancement of both signal gain and effective gain-bandwidth by 15 dB (small signal gain) and 20 nm, respectively, compared to the performance of the Raman-only amplifier.
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Dynamic properties of single Pump, dispersion-compensating Raman/EDFA hybrid amplifier recycling residual Raman Pump.
Optics Express, 2004Co-Authors: You Min ChangAbstract:We experimentally investigate transient effects of our proposed single Pump, dispersion-compensating Raman/EDFA hybrid amplifier recycling residual Raman Pump in a cascaded EDF under the situation of multi-channel add/drop, and then demonstrate the use of a FBG based all-optical gain-clamping technique to efficiently suppress the output transients. The results show that the proposed hybrid amplifier has a significantly long transient response time of ~2 ms compared to the previous reported value of the conventional separate Pump, Raman/EDFA hybrid amplifiers due to both the low-Pumping regime operation of 14XX nm Pumped EDFA section and the additional Pump transit time through the 12.6 km long dispersion compensating fiber to reach the EDF. However, using a simple gain-clamping method we obtain an almost, transient-free operation.
Young-geun Han - 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: Sunduck Kim, HYEONG SEOK LEE, Oh-Jang Kwon, Chang-seok Kim, Young-geun HanAbstract: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. © 2013 Optical Society of America.
