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- W3175485701 abstract "We experimentally demonstrate a novel optical fiber chemosensor for trace Cu 2+ ions detection that is implemented by using an in-line optical fiber Mach–Zehnder interferometer (MZI) in conjunction with an optoelectronic oscillator (OEO). The MZI is fabricated by lateral offset splicing a section of D-shaped fiber between two single-mode fibers. It splices the broadband optical source into a sinusoidal-shaped light, which can form a single passband microwave photonic filter (MPF) by combining the Mach–Zehnder modulator, a segment of fiber and a photodetector. The center frequency of the MPF, determined by the free spectra range of MZI, is affected by the solution concentration. Incorporating the MPF in the OEO sensor, the oscillation frequency is determined by the solution concentration. Therefore, we can estimate the solution concentration by measuring the microwave frequency change. We carry out a proof to concept experiment. High sensitivity Cu 2+ ions concentration sensing with sensitivity of 13 Hz /( μM / L ) is achieved. The maximum measurement error of concentration obtained is within 1.38 μM / L . The proposed sensor has merits of high interrogation speed, simple operation, high sensitivity and accuracy, offering the potentials in a wide range of biological application scenarios." @default.
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- W3175485701 date "2021-07-09" @default.
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- W3175485701 title "Trace copper detection using in-line optical fiber Mach–Zehnder interferometer combined with an optoelectronic oscillator" @default.
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- W3175485701 doi "https://doi.org/10.1364/oe.430036" @default.
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