The Experts below are selected from a list of 35523 Experts worldwide ranked by ideXlab platform
Selim M Shahriar - One of the best experts on this subject based on the ideXlab platform.
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superluminal raman laser with enhanced Cavity Length sensitivity
Optics Express, 2019Co-Authors: Zifan Zhou, M Zhou, Selim M ShahriarAbstract:We demonstrate experimentally a superluminal ring laser based on optically pumped Raman gain, and a self-pumped Raman depletion for producing anomalous dispersion, employing two isotopes of rubidium. By fitting the experiment data with the theoretical model, we infer that the spectral sensitivity of the superluminal Raman laser to Cavity Length change is enhanced by a factor of more than a thousand, compared to a conventional laser.
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a superluminal raman laser with enhanced Cavity Length sensitivity
Conference on Lasers and Electro-Optics, 2019Co-Authors: Zifan Zhou, M Zhou, Selim M ShahriarAbstract:We demonstrate experimentally an optically pumped Raman laser with a self-pumped Raman depletion employing two isotopes of rubidium, achieving an inferred spectral sensitivity to Cavity Length change by a factor of more than a thousand.
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a subluminal laser with extreme insensitivity to Cavity Length change
Conference on Lasers and Electro-Optics, 2015Co-Authors: Zifan Zhou, J Yablon, Y Wang, Jacob Scheuer, Selim M ShahriarAbstract:With a narrow peak on top of a broad-band gain profile in a laser, the group-velocity of light becomes significantly subluminal. The lasing frequency becomes extremely insensitive to Cavity Length change in such a laser.
Wei Wang - One of the best experts on this subject based on the ideXlab platform.
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squared peak to peak algorithm for the spectral interrogation of short Cavity fiber optic fabry perot sensors
Applied Optics, 2020Co-Authors: Haibin Chen, Xiongxing Zhang, Yao Zhang, Yang Li, Xin Jing, Suzhe Yuan, Wei WangAbstract:The Cavity Length of short-Cavity Fabry–Perot (FP) sensors cannot be effectively interrogated using the conventional peak-to-peak method if the spectrum of the exciting source is not wide enough. In this paper, we propose a squared peak-to-peak algorithm for interrogation of short-Cavity fiber-optic FP sensors. By squaring the DC-filtered reflection spectrum of an FP sensor in the frequency domain, we produce an additional peak, with which the Cavity Length of a sensor can be estimated using the same calculations as performed with the conventional peak-to-peak method. For investigation of the feasibility of this technique, we conducted simulations and practical experiments analyzing fiber-optic FP sensors with Cavity Lengths in the range of 15–25 µm. The maximum error in Cavity Length estimated using the proposed algorithm in experiments was 0.030 µm.
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A Zero-Cross Detection Algorithm for Cavity-Length Interrogation of Fiber-Optic Fabry-Perot Sensors.
Sensors, 2019Co-Authors: Zhibo Ma, Tongxin Guo, Zechen Song, Xirui Huang, Tianyang Zhang, Haibin Chen, Weizheng Yuan, Wei WangAbstract:A zero-cross detection algorithm was proposed for the Cavity-Length interrogation of fiber-optic Fabry–Perot (FP) sensors. The method can avoid the inaccuracy of peak determination in the conventional peak-to-peak method for the Cavity-Length interrogation of fiber-optic FP sensors caused by the slow variation of the spectral power density in peak neighboring regions. Both simulations and experiments were carried out to investigate the feasibility and performance of the zero-cross detection algorithm. Fiber-optic FP sensors with Cavity Lengths in the range of 150–1000 μm were successfully interrogated with a maximum error of 0.083 μm.
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absolute single Cavity Length interrogation of fiber optic compound fabry perot pressure sensors through a white light non scanning correlation method
Sensors, 2019Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Qingqing Chen, Wei Wang, Haibin ChenAbstract:A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute Length of the air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity Length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity Length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the air Cavity Length and the gas pressure imposed was successfully extracted.
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Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method
Sensors, 2019Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Haibin Chen, Qingqing Chen, Wei Wang, Zhibo MaAbstract:A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute Length of the air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity Length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity Length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the air Cavity Length and the gas pressure imposed was successfully extracted.
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pressure oscillation and steam Cavity during the condensation of a submerged steam jet
Annals of Nuclear Energy, 2015Co-Authors: Quanbin Zhao, Wei Wang, Weixiong Chen, Fang Yuan, Daotong Chong, Junjie YanAbstract:Abstract Steam jet condensation is important in many industrial applications. In this work, the pressure oscillation and steam jet patterns during submerged jet condensation in quiescent water is investigated experimentally. Firstly, it is found that even at stable condensation region, the steam Cavity Length varies all the time and steam bubbles separate from the steam Cavity periodically. With the variation of steam Cavity Length and separated bubble oscillation, condensation also undergoes oscillation. Along the axial direction, the pressure oscillation intensity increases first and then decreases gradually. There is an distinct pressure oscillation peak, and the peak position varies over a Length-to-diameter ratio range of X / D = 2 to X / D = 7. The axial position of pressure oscillation peak corresponds to the end of steam Cavity. Moreover, oscillation energy analysis shows that the oscillation energy generated by separated steam bubble is much higher than that generated by the steam Cavity Length variation. Finally, based on the relationship between the axial distribution of pressure oscillation and the steam Cavity, a method is proposed to determine the maximum steam Cavity Length by measuring the pressure oscillation distributions. The predicted deviation is only in range of ±16% for the test conditions.
Haibin Chen - One of the best experts on this subject based on the ideXlab platform.
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squared peak to peak algorithm for the spectral interrogation of short Cavity fiber optic fabry perot sensors
Applied Optics, 2020Co-Authors: Haibin Chen, Xiongxing Zhang, Yao Zhang, Yang Li, Xin Jing, Suzhe Yuan, Wei WangAbstract:The Cavity Length of short-Cavity Fabry–Perot (FP) sensors cannot be effectively interrogated using the conventional peak-to-peak method if the spectrum of the exciting source is not wide enough. In this paper, we propose a squared peak-to-peak algorithm for interrogation of short-Cavity fiber-optic FP sensors. By squaring the DC-filtered reflection spectrum of an FP sensor in the frequency domain, we produce an additional peak, with which the Cavity Length of a sensor can be estimated using the same calculations as performed with the conventional peak-to-peak method. For investigation of the feasibility of this technique, we conducted simulations and practical experiments analyzing fiber-optic FP sensors with Cavity Lengths in the range of 15–25 µm. The maximum error in Cavity Length estimated using the proposed algorithm in experiments was 0.030 µm.
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A Zero-Cross Detection Algorithm for Cavity-Length Interrogation of Fiber-Optic Fabry-Perot Sensors.
Sensors, 2019Co-Authors: Zhibo Ma, Tongxin Guo, Zechen Song, Xirui Huang, Tianyang Zhang, Haibin Chen, Weizheng Yuan, Wei WangAbstract:A zero-cross detection algorithm was proposed for the Cavity-Length interrogation of fiber-optic Fabry–Perot (FP) sensors. The method can avoid the inaccuracy of peak determination in the conventional peak-to-peak method for the Cavity-Length interrogation of fiber-optic FP sensors caused by the slow variation of the spectral power density in peak neighboring regions. Both simulations and experiments were carried out to investigate the feasibility and performance of the zero-cross detection algorithm. Fiber-optic FP sensors with Cavity Lengths in the range of 150–1000 μm were successfully interrogated with a maximum error of 0.083 μm.
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absolute single Cavity Length interrogation of fiber optic compound fabry perot pressure sensors through a white light non scanning correlation method
Sensors, 2019Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Qingqing Chen, Wei Wang, Haibin ChenAbstract:A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute Length of the air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity Length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity Length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the air Cavity Length and the gas pressure imposed was successfully extracted.
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Absolute Single Cavity Length Interrogation of Fiber-Optic Compound Fabry–Perot Pressure Sensors Through a White Light Non-Scanning Correlation Method
Sensors, 2019Co-Authors: Zilong Guo, Wentao Lv, Xiongxing Zhang, Haibin Chen, Qingqing Chen, Wei Wang, Zhibo MaAbstract:A white light non-scanning correlation interrogation system was proposed and built to interrogate absolute Length of the air Cavity of fiber-optic compound Fabry–Perot pressure sensors for the extraction of pressure value. By carefully choosing thickness range and tilt angle of the optical wedge used for Cavity Length matching, correlation interferometric signal of the basal Cavity can be naturally filtered out. Based on peak positioning by Fourier transform, bandpass filtering in frequency domain, inverse Fourier transform back to time domain, envelope fitting and zero fringe finding through a gravity center method, Cavity Length can be determined with an accuracy of 0.04%. The system was used for the interrogation of a fiber-optic compound Fabry–Perot pressure sensor under different pressures. For a pressure range of 0.1~2.9 Mpa, the linear relationship between the air Cavity Length and the gas pressure imposed was successfully extracted.
Chienchung Lin - One of the best experts on this subject based on the ideXlab platform.
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high speed directly modulated fabry perot lasers with an ultra short Cavity Length
IEEE Photonics Technology Letters, 2020Co-Authors: Yilin Tsai, Shou Wei Wang, Huang Hsiung Huang, Hsiang Yun Shih, Wei Lin, Chienchung LinAbstract:In this study, Fabry-Perot quantum well lasers with shortened Cavity designs (25 and 50 μm) were fabricated. The devices had dry-etched and cleaved facets and exhibited an output power of up to 2.36 mW for a Cavity Length of 25 μm; good spectral performance was achieved. Single-optical-mode operation with better than 25dB of side mode suppression ratio can be achieved for the fabricated devices with 25- and 50-μm cavities. The short-Cavity devices also exhibited highspeed modulation at elevated temperatures. Moreover, 25 Gb/s eye diagrams could be obtained at 65°C for the 25μm device and 55°C for the 50μm device. Due to their small area, ultra-short-Cavity Fabry-Perot laser can be suitably used in next-generation light sources for optical communication.
Zifan Zhou - One of the best experts on this subject based on the ideXlab platform.
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superluminal raman laser with enhanced Cavity Length sensitivity
Optics Express, 2019Co-Authors: Zifan Zhou, M Zhou, Selim M ShahriarAbstract:We demonstrate experimentally a superluminal ring laser based on optically pumped Raman gain, and a self-pumped Raman depletion for producing anomalous dispersion, employing two isotopes of rubidium. By fitting the experiment data with the theoretical model, we infer that the spectral sensitivity of the superluminal Raman laser to Cavity Length change is enhanced by a factor of more than a thousand, compared to a conventional laser.
-
a superluminal raman laser with enhanced Cavity Length sensitivity
Conference on Lasers and Electro-Optics, 2019Co-Authors: Zifan Zhou, M Zhou, Selim M ShahriarAbstract:We demonstrate experimentally an optically pumped Raman laser with a self-pumped Raman depletion employing two isotopes of rubidium, achieving an inferred spectral sensitivity to Cavity Length change by a factor of more than a thousand.
-
a subluminal laser with extreme insensitivity to Cavity Length change
Conference on Lasers and Electro-Optics, 2015Co-Authors: Zifan Zhou, J Yablon, Y Wang, Jacob Scheuer, Selim M ShahriarAbstract:With a narrow peak on top of a broad-band gain profile in a laser, the group-velocity of light becomes significantly subluminal. The lasing frequency becomes extremely insensitive to Cavity Length change in such a laser.