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Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Fiber-optic interferometric sensor arrays with freedom from source phase-induced noise.
Optics Letters
|September 5, 2009
Summary
We developed all-passive remote sensors that eliminate noise and crosstalk. This innovation uses time-domain addressing and synthetic heterodyne demodulation for reliable, sensitive measurements, achieving below 40 microrad/radicalHz sensitivity.
Area of Science:
- Photonics and Sensor Technology
- Optical Sensing Systems
Background:
- Traditional remote sensing arrays suffer from source phase-induced intensity noise and sensor crosstalk.
- Environmental factors can cause signal fading in optical sensing systems.
Purpose of the Study:
- To propose and demonstrate an array of all-passive remote sensors.
- To achieve noise-free and crosstalk-free sensor operation.
- To enhance signal stability against environmental disturbances.
Main Methods:
- Utilizing high-duty-cycle time-domain addressing with laser diodes.
- Implementing a synthetic heterodyne demodulation technique.
- Developing an all-fiber implementation for a single remote sensor.
Main Results:
- Demonstrated freedom from source phase-induced intensity noise.
- Achieved elimination of crosstalk between sensors.
- Measured a sensitivity of below 40 microrad/radicalHz at signal frequencies above 600 Hz.
- Showcased downlead insensitivity and prevention of signal fading.
Conclusions:
- The proposed all-passive sensor array offers a robust solution for remote sensing applications.
- The synthetic heterodyne technique effectively combats environmental signal fading.
- The system demonstrates high sensitivity and reliability for advanced optical sensing.
