The Experts below are selected from a list of 115251 Experts worldwide ranked by ideXlab platform
Hoikwong Lo - One of the best experts on this subject based on the ideXlab platform.
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frequency shifted mach zehnder interferometer for locating multiple weak reflections along a fiber link
IEEE Photonics Technology Letters, 2006Co-Authors: Bing Qi, Andrew Tausz, Li Qian, Hoikwong LoAbstract:We propose and demonstrate a novel technique for measuring fiber Lengths and locating multiple weak reflections along the fiber using a low-cost continuous wave source, a folded Mach-Zehnder interferometer (MZI), and a frequency shifter. By sweeping the frequency of the shifter, which is located in one path of the MZI, the Optical Length of the test fiber can be determined precisely from the interference pattern constructed by the reflected signals from the fiber end. Experimentally, for fibers shorter than 10 km, the standard deviations are less than 1 mm. Furthermore, by incorporating lock-in detection and fast Fourier transform techniques, both the locations and the reflectance of multiple reflection sites along one fiber can be resolved with a spatial resolution of about 5 m and a sensitivity better than -67dB. This could be a powerful interrogating technique for Optical fiber sensor arrays.
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high resolution large dynamic range fiber Length measurement based on a frequency shifted asymmetric sagnac interferometer
Optics Letters, 2005Co-Authors: Andrew Tausz, Li Qian, Hoikwong LoAbstract:We propose and experimentally demonstrate a single-mode fiber Length and dispersion measurement system based on what we believe to be a novel frequency-shifted asymmetric Sagnac interferometer incorporating an acousto-optic modulator (AOM). By sweeping the driving frequency of the AOM, which is asymmetrically placed in the Sagnac loop, the Optical Length of the fiber can be determined by measuring the corresponding variation in the phase delay between the two counterpropagating light beams. Combined with a high-resolution data processing algorithm, this system yields a dynamic range from a few centimeters to 60?km (limited by our availability of long fibers) with a resolution of ?1? partpermillion for long fibers.
Alba Sicher - One of the best experts on this subject based on the ideXlab platform.
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structural color from solid state polymerization induced phase separation
Soft Matter, 2021Co-Authors: Alba Sicher, Rabea Ganz, Andreas Menzel, Daniel Messmer, Guido Panzarasa, Maria Feofilova, Richard O Prum, Robert W Style, Vinodkumar SaranathanAbstract:Structural colors are produced by waveLength-dependent scattering of light from nanostructures. While living organisms often exploit phase separation to directly assemble structurally colored materials from macromolecules, synthetic structural colors are typically produced in a two-step process involving the sequential synthesis and assembly of building blocks. Phase separation is attractive for its simplicity, but applications are limited due to a lack of robust methods for its control. A central challenge is to arrest phase separation at the desired Length scale. Here, we show that solid-state polymerization-induced phase separation can produce stable structures at Optical Length scales. In this process, a polymeric solid is swollen and softened with a second monomer. During its polymerization, the two polymers become immiscible and phase separate. As free monomer is depleted, the host matrix resolidifies and arrests coarsening. The resulting polymeric composites have a blue or white appearance. We compare these biomimetic nanostructures to those in structurally-colored feather barbs, and demonstrate the flexibility of this approach by producing structural color in filaments and large sheets.
Andrew Tausz - One of the best experts on this subject based on the ideXlab platform.
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frequency shifted mach zehnder interferometer for locating multiple weak reflections along a fiber link
IEEE Photonics Technology Letters, 2006Co-Authors: Bing Qi, Andrew Tausz, Li Qian, Hoikwong LoAbstract:We propose and demonstrate a novel technique for measuring fiber Lengths and locating multiple weak reflections along the fiber using a low-cost continuous wave source, a folded Mach-Zehnder interferometer (MZI), and a frequency shifter. By sweeping the frequency of the shifter, which is located in one path of the MZI, the Optical Length of the test fiber can be determined precisely from the interference pattern constructed by the reflected signals from the fiber end. Experimentally, for fibers shorter than 10 km, the standard deviations are less than 1 mm. Furthermore, by incorporating lock-in detection and fast Fourier transform techniques, both the locations and the reflectance of multiple reflection sites along one fiber can be resolved with a spatial resolution of about 5 m and a sensitivity better than -67dB. This could be a powerful interrogating technique for Optical fiber sensor arrays.
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high resolution large dynamic range fiber Length measurement based on a frequency shifted asymmetric sagnac interferometer
Optics Letters, 2005Co-Authors: Andrew Tausz, Li Qian, Hoikwong LoAbstract:We propose and experimentally demonstrate a single-mode fiber Length and dispersion measurement system based on what we believe to be a novel frequency-shifted asymmetric Sagnac interferometer incorporating an acousto-optic modulator (AOM). By sweeping the driving frequency of the AOM, which is asymmetrically placed in the Sagnac loop, the Optical Length of the fiber can be determined by measuring the corresponding variation in the phase delay between the two counterpropagating light beams. Combined with a high-resolution data processing algorithm, this system yields a dynamic range from a few centimeters to 60?km (limited by our availability of long fibers) with a resolution of ?1? partpermillion for long fibers.
Li Qian - One of the best experts on this subject based on the ideXlab platform.
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frequency shifted mach zehnder interferometer for locating multiple weak reflections along a fiber link
IEEE Photonics Technology Letters, 2006Co-Authors: Bing Qi, Andrew Tausz, Li Qian, Hoikwong LoAbstract:We propose and demonstrate a novel technique for measuring fiber Lengths and locating multiple weak reflections along the fiber using a low-cost continuous wave source, a folded Mach-Zehnder interferometer (MZI), and a frequency shifter. By sweeping the frequency of the shifter, which is located in one path of the MZI, the Optical Length of the test fiber can be determined precisely from the interference pattern constructed by the reflected signals from the fiber end. Experimentally, for fibers shorter than 10 km, the standard deviations are less than 1 mm. Furthermore, by incorporating lock-in detection and fast Fourier transform techniques, both the locations and the reflectance of multiple reflection sites along one fiber can be resolved with a spatial resolution of about 5 m and a sensitivity better than -67dB. This could be a powerful interrogating technique for Optical fiber sensor arrays.
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High-resolution, large dynamic range fiber Length measurement based on frequency-shifted asymmetrical Sagnac interferometer
'The Optical Society', 2006Co-Authors: Qi Bing, Li Qian, Tausz Andrew, Lo Hoi-kwongAbstract:We propose and experimentally demonstrate a single-mode fiber Length and dispersion measurement system based on a novel frequency-shifted asymmetric Sagnac interferometer incorporating an acousto-optic modulator (AOM). By sweeping the driving frequency of the AOM, which is asymmetrically placed in the Sagnac loop, the Optical Length of the fiber can be determined by measuring the corresponding variation in the phase delay between the two counter-propagating light beams. Combined with a high-resolution data processing algorithm, this system yields a dynamic range from a few centimeters to 60km (limited only by our availability of long fibers) with a resolution about 1ppm for long fibers.Comment: 3 page
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high resolution large dynamic range fiber Length measurement based on a frequency shifted asymmetric sagnac interferometer
Optics Letters, 2005Co-Authors: Andrew Tausz, Li Qian, Hoikwong LoAbstract:We propose and experimentally demonstrate a single-mode fiber Length and dispersion measurement system based on what we believe to be a novel frequency-shifted asymmetric Sagnac interferometer incorporating an acousto-optic modulator (AOM). By sweeping the driving frequency of the AOM, which is asymmetrically placed in the Sagnac loop, the Optical Length of the fiber can be determined by measuring the corresponding variation in the phase delay between the two counterpropagating light beams. Combined with a high-resolution data processing algorithm, this system yields a dynamic range from a few centimeters to 60?km (limited by our availability of long fibers) with a resolution of ?1? partpermillion for long fibers.
Vinodkumar Saranathan - One of the best experts on this subject based on the ideXlab platform.
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structural color from solid state polymerization induced phase separation
Soft Matter, 2021Co-Authors: Alba Sicher, Rabea Ganz, Andreas Menzel, Daniel Messmer, Guido Panzarasa, Maria Feofilova, Richard O Prum, Robert W Style, Vinodkumar SaranathanAbstract:Structural colors are produced by waveLength-dependent scattering of light from nanostructures. While living organisms often exploit phase separation to directly assemble structurally colored materials from macromolecules, synthetic structural colors are typically produced in a two-step process involving the sequential synthesis and assembly of building blocks. Phase separation is attractive for its simplicity, but applications are limited due to a lack of robust methods for its control. A central challenge is to arrest phase separation at the desired Length scale. Here, we show that solid-state polymerization-induced phase separation can produce stable structures at Optical Length scales. In this process, a polymeric solid is swollen and softened with a second monomer. During its polymerization, the two polymers become immiscible and phase separate. As free monomer is depleted, the host matrix resolidifies and arrests coarsening. The resulting polymeric composites have a blue or white appearance. We compare these biomimetic nanostructures to those in structurally-colored feather barbs, and demonstrate the flexibility of this approach by producing structural color in filaments and large sheets.