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Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Measurement of small phase shifts using a single-mode optical-fiber interferometer.

D A Jackson1, A Dandridge, S K Sheem

  • 1Naval Research Laboratory, Washington, DC 20375, USA.

Optics Letters
|August 21, 2009
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Summary

Researchers induced and detected periodic phase changes in a fiber optic interferometer using a piezoelectric cylinder. This method allows for precise measurements in the 10(-6) radian range.

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Area of Science:

  • Optics and Photonics
  • Fiber Optic Sensing
  • Interferometry

Background:

  • Fiber optic sensors are crucial for precise physical measurements.
  • Mach-Zehnder interferometers offer high sensitivity but require stable phase control.
  • Controlling phase changes in real-time is essential for advanced applications.

Purpose of the Study:

  • To demonstrate the induction and detection of periodic phase changes in a fiber optic interferometer.
  • To investigate the use of piezoelectric actuators for precise phase modulation.
  • To achieve phase resolution in the 10(-6) radian range.

Main Methods:

  • Utilized a single-mode all-fiber Mach-Zehnder interferometer.
  • Employed a piezoelectric cylinder to stretch the optical fiber.
  • Drove the piezoelectric cylinder at frequencies ranging from 40 Hz to 10 kHz.
  • Detected induced periodic phase changes.

Main Results:

  • Successfully induced and detected periodic phase changes within the 10(-6) radian range.
  • Demonstrated effective phase modulation using piezoelectric actuation.
  • Established a reliable method for high-resolution phase change detection in fiber optics.

Conclusions:

  • Piezoelectric-driven fiber stretching is an effective method for inducing and detecting small, periodic phase changes.
  • The developed technique offers high sensitivity suitable for advanced fiber optic sensing applications.
  • This work contributes to the field of precision optical metrology and sensing.