The Experts below are selected from a list of 17817 Experts worldwide ranked by ideXlab platform
Viktor Gruev - One of the best experts on this subject based on the ideXlab platform.
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polarization division multiplexing for Optical data communications
Optical Interconnects XVIII 2018, 2018Co-Authors: Darko Ivanovich, Samuel B Powell, Roger D Chamberlain, Viktor GruevAbstract:Multiple parallel channels are ubiquitous in Optical communications, with spatial division multiplexing (separate physical paths) and wavelength division multiplexing (separate Optical wavelengths) being the most common forms. Here, we investigate the viability of polarization division multiplexing, the separation of distinct parallel Optical communication channels through the polarization properties of light. Two or more linearly polarized Optical Signals (at different polarization angles) are transmitted through a common medium, filtered using aluminum nanowire Optical filters fabricated on-chip, and received using individual silicon photodetectors (one per channel). The entire receiver (including optics) is compatible with standard CMOS fabrication processes. The filter model is based upon an input Optical Signal formed as the sum of the Stokes vectors for each individual channel, transformed by the Mueller matrix that models the filter proper, resulting in an Output Optical Signal that impinges on each photodiode. The results show that two- and three-channel systems can operate with a fixed-threshold comparator in the receiver circuit, but four-channel systems (and larger) will require channel coding of some form. For example, in the four-channel system, 10 of 16 distinct bit patterns are separable by the receiver. The model supports investigation of the range of variability tolerable in the fabrication of the on-chip polarization filters.
Norman W Garrick - One of the best experts on this subject based on the ideXlab platform.
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a special fiber optic sensor for measuring wheel loads of vehicles on highways
Sensors, 2008Co-Authors: Ramesh B Malla, Amlan Sen, Norman W GarrickAbstract:This paper presents results from an investigation on a special Optical fiber as a load sensor for application in Weigh-in-Motion (WIM) systems to measure wheel loads of vehicles traveling at normal speed on highways. The fiber used has a unique design with two concentric light guiding regions of different effective Optical path lengths, which has the potential to enable direct measurement of magnitudes as well as locations of forces acting at multiple points along a single fiber. The Optical characteristic of the fiber for intended sensing purpose was first assessed by a simple fiber bending experiment and by correlating the bend radii with the Output light Signal intensities. A simple laboratory load transmitting/fiber bending device was then designed and fabricated to appropriately bend the Optical fiber under applied loads in order to make the fiber work as load sensor. The device with the Optical fiber was tested under a universal loading machine and an actual vehicle wheel in the laboratory. The test results showed a good relationship between the magnitude of the applied load and the Output Optical Signal changes. The results also showed a good correlation between the time delay between the inner and outer core light pulses and the distance of the applied load as measured from the Output end of the fiber.
Santanu Bhattacharya - One of the best experts on this subject based on the ideXlab platform.
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Metal Complex as an Optical Sensing Platform for Rapid Multimodal Recognition of a Pathogenic Biomarker in Real-Life Samples
2018Co-Authors: Nilanjan Dey, Dipen Biswakarma, Santanu BhattacharyaAbstract:Anthraimidazoledione-based charge transfer dyes have been designed for multimodal detection of a pathogenic biomarker, dipicolinic acid (DPA), at physiological pH. A change in visible color from yellow to red was observed along with an appearance of red luminescence when the probe-Eu3+ complex was exposed to DPA. Conversely, with the probe-Cu2+ complex, the solution color turns into orange in the presence of DPA with blue-colored fluorescence. Thus, the present sensory system can achieve naked-eye detection of DPA, which is very rare for metal complex-based probes. Mechanistic investigations revealed that variations in the metal ion center influence the nature of the DPA interaction, which subsequently dictates the Output Optical Signal. DPA forms a ternary complex with the probe-Eu3+ conjugate, while in the case of Cu2+, it dissociates the preformed probe-metal ion conjugate. Interestingly, at a given concentration of DPA, the probe with the 2,2′-(phenylazanediyl)diacetic acid group (1) at the receptor end shows a more prominent change with DPA as compared to the probe with the 2,2′-((2-(carboxymethoxy)phenyl)azanediyl)diacetic acid (2) functional group. Subsequently, the system is involved in the screening of DPA in complex real-life samples, such as human blood serum, urine, natural water and soil samples, etc. In addition, the present assay can be employed for quantitative evaluation of Bacillus subtilis spores, and as low as 2.2 × 104 spores/mL was detected. Further, to extend the practical implication, low-cost paper-based devices are developed as an eco-friendly alternative for on-location detection of DPA
Bhattacharya Santanu - One of the best experts on this subject based on the ideXlab platform.
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Metal Complex as an Optical Sensing Platform for Rapid Multimodal Recognition of a Pathogenic Biomarker in Real-Life Samples
AMER CHEMICAL SOC, 2019Co-Authors: Dey Nilanjan, Biswakarma Dipen, Bhattacharya SantanuAbstract:Anthraimidazoledione-based charge transfer dyes have been designed for multimodal detection of a pathogenic biomarker, dipicolinic acid (DPA), at physiological pH. A change in visible color from yellow to red was observed along with an appearance of red luminescence when the probe-Eu3+ complex was exposed to DPA. Conversely, with the probe-Cu2+ complex, the solution color turns into orange in the presence of DPA with blue-colored fluorescence. Thus, the present sensory system can achieve naked-eye detection of DPA, which is very rare for metal complex-based probes. Mechanistic investigations revealed that variations in the metal ion center influence the nature of the DPA interaction, which subsequently dictates the Output Optical Signal. DPA forms a ternary complex with the probe-Eu3+ conjugate, while in the case of Cu2+, it dissociates the preformed probe-metal ion conjugate. Interestingly, at a given concentration of DPA, the probe with the 2,2'-(phenylazanediyl)diacetic acid group (1) at the receptor end shows a more prominent change with DPA as compared to the probe with the 2,2'-((2-(carboxymethoxy)phenyl)azanediyl)diacetic acid (2) functional group. Subsequently, the system is involved in the screening of DPA in complex real-life samples, such as human blood serum, urine, natural water and soil samples, etc. In addition, the present assay can be employed for quantitative evaluation of Bacillus subtilis spores, and as low as 2.2 x 10(4) spores/mL was detected. Further, to extend the practical implication, low-cost paper-based devices are developed as an eco-friendly alternative for on-location detection of DPA
Ramesh B Malla - One of the best experts on this subject based on the ideXlab platform.
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a special fiber optic sensor for measuring wheel loads of vehicles on highways
Sensors, 2008Co-Authors: Ramesh B Malla, Amlan Sen, Norman W GarrickAbstract:This paper presents results from an investigation on a special Optical fiber as a load sensor for application in Weigh-in-Motion (WIM) systems to measure wheel loads of vehicles traveling at normal speed on highways. The fiber used has a unique design with two concentric light guiding regions of different effective Optical path lengths, which has the potential to enable direct measurement of magnitudes as well as locations of forces acting at multiple points along a single fiber. The Optical characteristic of the fiber for intended sensing purpose was first assessed by a simple fiber bending experiment and by correlating the bend radii with the Output light Signal intensities. A simple laboratory load transmitting/fiber bending device was then designed and fabricated to appropriately bend the Optical fiber under applied loads in order to make the fiber work as load sensor. The device with the Optical fiber was tested under a universal loading machine and an actual vehicle wheel in the laboratory. The test results showed a good relationship between the magnitude of the applied load and the Output Optical Signal changes. The results also showed a good correlation between the time delay between the inner and outer core light pulses and the distance of the applied load as measured from the Output end of the fiber.