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Related Experiment Video

Updated: May 21, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
09:03

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Subfrequency noise signal extraction in fiber-optic strain sensors using postprocessing.

Timothy T-Y Lam1, Malcolm B Gray, Daniel A Shaddock

  • 1Centre for Gravitational Physics, Department of Quantum Science, The Australian National University Building, 38a Science Road, Acton, Australian Capital Territory 0200, Australia. timothy.lam@anu.edu.au

Optics Letters
|June 5, 2012
PubMed
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This study introduces a fiber sensing system using time delay interferometry to overcome laser frequency noise. The new method significantly reduces noise, enabling highly sensitive strain measurements below typical limits.

Area of Science:

  • Optics and Photonics
  • Sensor Technology
  • Metrology

Background:

  • High-resolution interferometric fiber sensors are crucial for precise measurements.
  • Laser frequency fluctuations are a primary limitation in sensor performance, introducing noise.
  • Existing systems struggle to achieve high sensitivity due to inherent laser noise.

Purpose of the Study:

  • To develop a fiber sensing system immune to laser frequency noise.
  • To demonstrate strain signal extraction below the conventional noise floor.
  • To quantify the noise reduction and strain sensitivity achieved.

Main Methods:

  • Implementation of time delay interferometry (TDI) for noise cancellation.
  • Design of a novel fiber sensing architecture.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

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Last Updated: May 21, 2026

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
09:03

A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response

Published on: January 7, 2019

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

  • Experimental validation of the TDI system's performance.

    • Main Results:

    • Achieved a reduction in the noise floor by a factor of 30.
    • Demonstrated strain sensitivities of 1 nanostrain/√Hz at 100 mHz.
    • Measured strain sensitivities reaching 100 ps/√Hz at 1 Hz.
    • Indicated potential for over 4.5 orders of magnitude frequency fluctuation rejection.

    Conclusions:

    • Time delay interferometry effectively eliminates laser frequency noise in fiber strain sensors.
    • The developed system offers unprecedented strain sensitivity.
    • This advancement opens new possibilities for precision sensing applications.