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A Transverse Load Sensor with Reconfigurable Measurement Accuracy Based on a Microwave Photonic Filter

  • Chen, Han (School of Instrument Science and Engineering, Southeast University) ;
  • Li, Changqing (School of Instrument Science and Engineering, Southeast University) ;
  • Min, Jing (School of Instrument Science and Engineering, Southeast University)
  • Received : 2018.04.28
  • Accepted : 2018.10.14
  • Published : 2018.12.25

Abstract

We propose a transverse load sensor with reconfigurable measurement accuracy based on a microwave photonic filter in the $K_u$ band, incorporating a polarization-maintaining fiber Bragg grating. A prototype sensor with a reconfigurable measurement accuracy tuning range from 6.09 to 9.56 GHz/(N/mm), and corresponding minimal detectable load range from 0.0167 to 0.0263 N/mm, is experimentally demonstrated. The results illustrate that up to 40% manufacturing error in the grating length can be dynamically calibrated to the same corresponding measurement accuracy for the proposed transverse load sensor, by controlling the semiconductor optical amplifier's injection current in the range of 154 to 419 mA.

Keywords

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FIG. 1. Experimental setup for the transverse load sensor based on a MPF.

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FIG. 2. Measured tunable MPF response without transverse load, by controlling the FP-SOA injection current.

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FIG. 3. Measured reconfigurable transverse-load measurement accuracy, by controlling the FP-SOA injection current.

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FIG. 4. Measured dynamic calibration curve, when the initial FP-SOA injection current is set to 419 mA.

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FIG. 5. Measured dynamic calibration for the transverse load sensor, by controlling the FP-SOA injection current.

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