The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Kazuo Hotate - One of the best experts on this subject based on the ideXlab platform.
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Automated Suppression of Polarization Fluctuation in Resonator Fiber Optic Gyro With Twin 90 $^{\circ}$ Polarization-Axis Rotated Splices
Journal of Lightwave Technology, 2013Co-Authors: Xijing Wang, Kazuo HotateAbstract:A method for automatically suppressing the polarization fluctuation in a resonator Fiber optic gyro by adopting a resonator with twin 90° polarization-axis rotated splices is proposed and demonstrated experimentally. The scheme ensures that the input electric field excites only the desired eigenstate of polarization in the resonator by automatically setting the length difference of the Fiber segments between the two 90° polarization-axis rotated splicing points at one half of the beat length of the polarization maintaining Fiber. The feasibility of the proposed scheme is shown by simulation using a mathematical model based on the Jones transfer matrix. It is also demonstrated experimentally that the bias stability is enhanced when the feedback scheme is adopted.
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measurement range elongation based on temporal gating in brillouin optical correlation domain distributed simultaneous sensing of strain and temperature
IEEE Photonics Technology Letters, 2012Co-Authors: Rodrigo Kendy Yamashita, Zuyuan He, Kazuo HotateAbstract:We had earlier demonstrated the distributed discrimination of strain and temperature by localizing and scanning both the stimulated Brillouin scattering and the Brillouin dynamic grating along a Polarization-Maintaining Fiber. The localization and scanning were performed by a correlation domain technique, whose measurement range was restricted by the distance between consecutive correlation peaks. To overcome this restriction, in this letter, we apply a temporal gating scheme to the system by enlarging the measurement range from ~25 to ~500 m. We report the results confirming the effectiveness of this scheme in a system operated by a single laser source, and demonstrate the strain-temperature discrimination when strain or temperature is applied to segments on the 500-m-long Fiber under test.
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automated suppression of polarization fluctuation in resonator Fiber optic gyro with twin 90 polarization axis rotated splices
Conference on Lasers and Electro-Optics, 2010Co-Authors: Xijing Wang, Kazuo HotateAbstract:Automated suppression of polarization-fluctuation in a Fiber optic gyro made of a Polarization-Maintaining Fiber (PMF) resonator with twin 90° polarization-axis rotated splices is experimentally demonstrated. The y-axis polarized component in the output of the resonator is detected to generate the feedback signal to adjust the length difference of the two Fiber segments between the two 90° polarization-axis rotated splicing points. When the length difference becomes a half of the beat-length of the PMF, only one eigen state of polarization is excited linearly polarized in x-axis direction, ensuring the suppression of polarization-fluctuation induced bias drift.
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demonstration of brillouin distributed discrimination of strain and temperature using a polarization maintaining optical Fiber
IEEE Photonics Technology Letters, 2010Co-Authors: Weiwen Zou, Kazuo HotateAbstract:Distributed discrimination of strain and temperature is demonstrated by localizing both the stimulated Brillouin scattering (SBS) and the dynamic acoustic grating generated in the SBS process in a Polarization-Maintaining Fiber with a correlation-domain continuous-wave technique. A 12- ?? strain resolution and 0.3°C temperature resolution together with a 10-cm spatial resolution are experimentally validated.
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reduction of polarization fluctuation induced drift in resonator Fiber optic gyro by a resonator with twin 90 polarization axis rotated splices
Optics Express, 2010Co-Authors: Xijing Wang, Kazuo HotateAbstract:A method to suppress polarization-fluctuation induced drift in resonator Fiber optic gyro (R-FOG) is demonstrated by a Polarization-Maintaining Fiber (PMF) resonator with twin 90° polarization-axis rotated splices. By setting the length difference of the Fiber segments between two 90° polarization-axis rotated splicing points to a half of the beat-length of the Fiber, a single eigen-state of polarization (ESOP) is excited with incident lightwave linearly polarized along the polarization-axis of the Fiber. Compared to the previously reported resonator employing single 90° polarization-axis rotated splice [1], in which two ESOPs are excited, our new scheme avoids the effect from the unwanted ESOP and thus suppresses the polarization-fluctuation induced drift in R-FOG output significantly.
Shuisheng Jian - One of the best experts on this subject based on the ideXlab platform.
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switchable single longitudinal mode dual wavelength erbium doped Fiber ring laser based on one polarization maintaining Fiber bragg grating incorporating saturable absorber and feedback Fiber loop
Optics Communications, 2009Co-Authors: Suchun Feng, Tigang Ning, Ou Xu, Shaohua Lu, Shuisheng JianAbstract:Switchable single-longitudinal-mode (SLM) dual-wavelength erbium-doped Fiber ring laser based on one Polarization-Maintaining Fiber Bragg grating (PMFBG) is demonstrated. Due to the enhancement of the polarization hole burning (PHB) by the PMFBG, the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336 nm at room temperature by adjusting a polarization controller (PC). The stable SLM operation is guaranteed by a compound-ring cavity and a saturable absorber (SA). The optical signal-to-noise ratio (OSNR) is over 45 dB. The amplitude variation in nearly one and half an hour is less than 0.2 dB.
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switchable dual wavelength erbium doped Fiber ring laser based on one polarization maintaining Fiber bragg grating in a sagnac loop interferometer
Optics and Laser Technology, 2009Co-Authors: Suchun Feng, Tigang Ning, Ou Xu, Shaohua Lu, Shuisheng JianAbstract:Abstract A switchable erbium-doped Fiber-ring laser providing dual-wavelength outputs with orthogonal polarizations when operating at room temperature is proposed. One Polarization-Maintaining Fiber Bragg grating (PMFBG) in a Sagnac loop interferometer is used as the wavelength-selective filter. Due to the enhancement of the polarization hole burning (PHB) by the PMFBG, the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336 nm at room temperature by adjusting a polarization controller (PC). The optical signal-to-noise ratio (OSNR) is over 42 dB. The amplitude variation over 90 min is less than 0.6 dB for both wavelengths.
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switchable multi wavelength erbium doped Fiber ring laser based on cascaded polarization maintaining Fiber bragg gratings in a sagnac loop interferometer
Optics Communications, 2008Co-Authors: Suchun Feng, Tigang Ning, Shuisheng JianAbstract:A switchable multi-wavelength erbium-doped Fiber (EDF) ring laser based on cascaded polarization maintaining Fiber Bragg gratings (PMFBGs) in a Sagnac loop interferometer as the wavelength-selective filter at room temperature is proposed. Due to the polarization hole burning (PHB) enhanced by the PMFBGs, stable single-, dual-, three- and four-wavelength lasing operations can be obtained. The laser can be switched among the stable single-, dual-, three- and four-wavelength lasing operations by adjusting the polarization controllers (PCs). The optical signal-to-noise ratio (OSNR) is over 50 dB.
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single polarization switchable dual wavelength erbium doped Fiber laser with two polarization maintaining Fiber bragg gratings
Optics Express, 2008Co-Authors: Suchun Feng, Tigang Ning, Ou Xu, Shaohua Lu, Xiangqiao Mao, Shuisheng JianAbstract:An improved erbium-doped Fiber laser configuration for achieving single-polarization, switchable dual-wavelength of orthogonal polarizations oscillations at room temperature is proposed. For the first time,two Fiber Bragg gratings (FBGs) directly written in a Polarization-Maintaining (PM) and photosensitive erbium-doped Fiber (PMPEDF) as the wavelength-selective component are used in a linear laser cavity. Due to the polarization hole burning (PHB) enhanced by the Polarization-Maintaining FBG (PMFBG), the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336nm at room temperature by adjusting a polarization controller (PC). Each lasing line shows a single polarization with a polarization extinction ratio of >25dB under different pump levels. The optical signal-to-noise ratio (OSNR) is greater than 50 dB. The amplitude variation with 16 times scans in nearly one and half an hour is less than 0.5dB at both operating wavelength.
Byoungho Lee - One of the best experts on this subject based on the ideXlab platform.
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simultaneous measurement of strain and temperature incorporating a long period Fiber grating inscribed on a polarization maintaining Fiber
IEEE Photonics Technology Letters, 2004Co-Authors: Kyung Jun Han, Yong Wook Lee, Jaehoon Jung, Jaejoong Kwon, Sookyoung Roh, Byoungho LeeAbstract:Simultaneous measurement of strain and temperature was demonstrated by using a long-period Fiber grating inscribed on a Polarization-Maintaining Fiber (PM-LPG). The spectral sensitivities of the two adjacent resonant dips of the PM-LPG were measured with respect to strain and temperature. The sensitivities of each resonant dip for strain and temperature were different in magnitude and sign, which makes this PM-LPG have a capability of simultaneously sensing strain and temperature. Experimental results show root mean square deviations of 15.6 /spl mu//spl epsiv/ and 0.7/spl deg/C for strain and temperature, respectively.
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wavelength switchable erbium doped Fiber ring laser using spectral polarization dependent loss element
IEEE Photonics Technology Letters, 2003Co-Authors: Yong Wook Lee, Byoungho LeeAbstract:We propose a wavelength-switchable erbium-doped Fiber ring laser that uses a spectral polarization-dependent loss element. The element was fabricated by inscribing a long-period grating on a Polarization-Maintaining Fiber. Dual-wavelength switching operation was accomplished by rotating the polarization plane of the Fiber laser cavity. The amplitude variation of both laser lines was measured to be less than 1 dB and the signal-to-amplified spontaneous emission ratio was more than /spl sim/40 dB.
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a Fiber bragg grating sensor demodulation technique using a polarization maintaining Fiber loop mirror
IEEE Photonics Technology Letters, 2001Co-Authors: Seunghwan Chung, Jungho Kim, Bongahn Yu, Byoungho LeeAbstract:We propose and experimentally demonstrate a simple, passive, and self-referencing wavelength shift detection scheme for use in Fiber Bragg grating sensing systems. The demodulation system is based on the interference between two modes in a polarization maintaining Fiber loop mirror. Although it involves the use of an interference technique, it is stable compared with other conventional interference demodulators.
Kwang Yong Song - One of the best experts on this subject based on the ideXlab platform.
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observation of narrowband intrinsic spectra of brillouin dynamic gratings
Optics Letters, 2010Co-Authors: Kwang Yong Song, Hyuk Jin YoonAbstract:We experimentally demonstrate that the reflection spectrum of a Brillouin dynamic grating in a Polarization-Maintaining Fiber can be much narrower than the intrinsic linewidth of the stimulated Brillouin scattering, matching well with the theory of a Fiber Bragg grating in terms of the linewidth and the reflectivity. A 3dB bandwidth as narrow as 10.5MHz is observed with the Brillouin dynamic grating generated in a 9m uniform Fiber.
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Time-domain distributed Fiber sensor with 1 cm spatial resolution based on brillouin dynamic grating
Journal of Lightwave Technology, 2010Co-Authors: Kwang Yong Song, Sang Hoon Chin, Nikolay Primerov, Luc ThevenazAbstract:We demonstrate an optical time-domain distributed Fiber sensor showing the highest spatial resolution ever reported based on Brillouin dynamic grating in a Polarization-Maintaining Fiber. In our scheme, the acoustic gratings containing the information on the local Brillouin frequency are generated by a long pump pulse in one polarization, and read out by a short probe pulse in the orthogonal polarization at a clearly distinct optical frequency from the pump. In the experiment, distributed temperature measurements over a 20 m Fiber are performed with 1.2 cm spatial resolution.
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High-resolution Brillouin optical time domain analysis based on Brillouin dynamic grating.
Optics Letters, 2009Co-Authors: Kwang Yong Song, Hyuk Jin YoonAbstract:We propose and experimentally demonstrate a high-resolution distributed measurement of the Brillouin gain spectrum in a Polarization-Maintaining Fiber (PMF) using Brillouin dynamic grating. In our approach, acoustic waves which contain the information of the local Brillouin frequency are generated by a long pump pulse in one polarization along the PMF and are read out by a short probe pulse with an orthogonal polarization at a different optical frequency from the pump. In experiments, a distributed strain measurement with a 10 cm spatial resolution is demonstrated in a 105 m PMF.
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optical time domain measurement of brillouin dynamic grating spectrum in a polarization maintaining Fiber
Optics Letters, 2009Co-Authors: Kwang Yong Song, Zuyuan He, Kazuo HotateAbstract:We demonstrate the distributed measurement of Brillouin dynamic grating spectra in a Polarization-Maintaining Fiber based on time-domain analysis. Local reflection spectra of the Brillouin dynamic grating are acquired by synchronized propagation of the pump and the probe pulses based on the map of the Brillouin frequency distribution. Large temperature sensitivity as high as −50.9 MHz/°C is observed with 2 m spatial resolution in 100 m range.
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all optical dynamic grating generation based on brillouin scattering in polarization maintaining Fiber
Optics Letters, 2008Co-Authors: Kwang Yong Song, Weiwen Zou, Kazuo HotateAbstract:We report a novel kind of all-optical dynamic grating based on Brillouin scattering in a polarization maintaining Fiber (PMF). A moving acoustic grating is generated by stimulated Brillouin scattering between writing beams in one polarization and used to reflect an orthogonally polarized reading beam at different wavelengths. The center wavelength of the grating is controllable by detuning the writing beams, and the 3 dB bandwidth of approximately 80 MHz is observed with the tunable reflectance of up to 4% in a 30 m PMF.
Suchun Feng - One of the best experts on this subject based on the ideXlab platform.
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switchable single longitudinal mode dual wavelength erbium doped Fiber ring laser based on one polarization maintaining Fiber bragg grating incorporating saturable absorber and feedback Fiber loop
Optics Communications, 2009Co-Authors: Suchun Feng, Tigang Ning, Ou Xu, Shaohua Lu, Shuisheng JianAbstract:Switchable single-longitudinal-mode (SLM) dual-wavelength erbium-doped Fiber ring laser based on one Polarization-Maintaining Fiber Bragg grating (PMFBG) is demonstrated. Due to the enhancement of the polarization hole burning (PHB) by the PMFBG, the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336 nm at room temperature by adjusting a polarization controller (PC). The stable SLM operation is guaranteed by a compound-ring cavity and a saturable absorber (SA). The optical signal-to-noise ratio (OSNR) is over 45 dB. The amplitude variation in nearly one and half an hour is less than 0.2 dB.
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switchable dual wavelength erbium doped Fiber ring laser based on one polarization maintaining Fiber bragg grating in a sagnac loop interferometer
Optics and Laser Technology, 2009Co-Authors: Suchun Feng, Tigang Ning, Ou Xu, Shaohua Lu, Shuisheng JianAbstract:Abstract A switchable erbium-doped Fiber-ring laser providing dual-wavelength outputs with orthogonal polarizations when operating at room temperature is proposed. One Polarization-Maintaining Fiber Bragg grating (PMFBG) in a Sagnac loop interferometer is used as the wavelength-selective filter. Due to the enhancement of the polarization hole burning (PHB) by the PMFBG, the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336 nm at room temperature by adjusting a polarization controller (PC). The optical signal-to-noise ratio (OSNR) is over 42 dB. The amplitude variation over 90 min is less than 0.6 dB for both wavelengths.
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switchable multi wavelength erbium doped Fiber ring laser based on cascaded polarization maintaining Fiber bragg gratings in a sagnac loop interferometer
Optics Communications, 2008Co-Authors: Suchun Feng, Tigang Ning, Shuisheng JianAbstract:A switchable multi-wavelength erbium-doped Fiber (EDF) ring laser based on cascaded polarization maintaining Fiber Bragg gratings (PMFBGs) in a Sagnac loop interferometer as the wavelength-selective filter at room temperature is proposed. Due to the polarization hole burning (PHB) enhanced by the PMFBGs, stable single-, dual-, three- and four-wavelength lasing operations can be obtained. The laser can be switched among the stable single-, dual-, three- and four-wavelength lasing operations by adjusting the polarization controllers (PCs). The optical signal-to-noise ratio (OSNR) is over 50 dB.
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single polarization switchable dual wavelength erbium doped Fiber laser with two polarization maintaining Fiber bragg gratings
Optics Express, 2008Co-Authors: Suchun Feng, Tigang Ning, Ou Xu, Shaohua Lu, Xiangqiao Mao, Shuisheng JianAbstract:An improved erbium-doped Fiber laser configuration for achieving single-polarization, switchable dual-wavelength of orthogonal polarizations oscillations at room temperature is proposed. For the first time,two Fiber Bragg gratings (FBGs) directly written in a Polarization-Maintaining (PM) and photosensitive erbium-doped Fiber (PMPEDF) as the wavelength-selective component are used in a linear laser cavity. Due to the polarization hole burning (PHB) enhanced by the Polarization-Maintaining FBG (PMFBG), the laser can be designed to operate in stable dual-wavelength or wavelength-switching modes with a wavelength spacing of 0.336nm at room temperature by adjusting a polarization controller (PC). Each lasing line shows a single polarization with a polarization extinction ratio of >25dB under different pump levels. The optical signal-to-noise ratio (OSNR) is greater than 50 dB. The amplitude variation with 16 times scans in nearly one and half an hour is less than 0.5dB at both operating wavelength.