In-Fiber Mach-Zehnder Interferometer Based on Waist-Enlarged Taper and Core-Mismatching for Strain Sensing

【摘要】 An in-fiber Mach-Zehnder interferometer for strain measurement is proposed and experimentally demonstrated.The sensor consists of a taper followed by a short section of a multi-mode fiber(MMF) and a dispersion compensating fiber(DCF),which is sandwiched between two single mode fibers(SMFs).The taper is used as a fiber coupler to excite cladding modes in the SMF,and these cladding modes transmit within the MMF and the DCF.The core mode and the cladding modes interfere in the DCF-SMF fusion point to form intermodal interference.A well-defined interference spectrum is obtained in the experiment.Selected interference dips are used to measure the strain changes.The experimental results show that this device is sensitive to strain with the wavelength-referenced sensitivity of 2.6pm/με and the power-referenced sensitivity of 0.0027 dB/με,respectively.更多还原

【Abstract】 An in-fiber Mach-Zehnder interferometer for strain measurement is proposed and experimentally demonstrated.The sensor consists of a taper followed by a short section of a multi-mode fiber(MMF) and a dispersion compensating fiber(DCF),which is sandwiched between two single mode fibers(SMFs).The taper is used as a fiber coupler to excite cladding modes in the SMF,and these cladding modes transmit within the MMF and the DCF.The core mode and the cladding modes interfere in the DCF-SMF fusion point to form intermodal interference.A well-defined interference spectrum is obtained in the experiment.Selected interference dips are used to measure the strain changes.The experimental results show that this device is sensitive to strain with the wavelength-referenced sensitivity of 2.6pm/με and the power-referenced sensitivity of 0.0027 dB/με,respectively.更多还原