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Digitally enhanced heterodyne interferometry.

Daniel A Shaddock1

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA. Daniel.Shaddock@jpl.nasa.gov

Optics Letters
|November 21, 2007
PubMed
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Digitally enhanced interferometry uses pseudorandom noise (PRN) codes to isolate optical signals by delay. This method improves measurement sensitivity and allows multiple component measurements in a single system.

Area of Science:

  • Optics and Photonics
  • Metrology
  • Signal Processing

Background:

  • Conventional interferometry faces limitations due to spurious interference, impacting measurement sensitivity.
  • Measuring multiple optical components often requires separate metrology systems.

Purpose of the Study:

  • To introduce and evaluate digitally enhanced interferometry for improved optical measurements.
  • To demonstrate the capability of isolating interferometric signals based on their delay.

Main Methods:

  • Employing digital modulation with pseudorandom noise (PRN) codes on the light source.
  • Isolating individual reflections by demodulating with a PRN code matched to the reflection's delay.
  • Analyzing and simulating the impact of PRN code properties on isolation and sensitivity.

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Main Results:

  • Achieved isolation of interferometric signals based on their time delay.
  • Demonstrated potential for improved measurement sensitivity by reducing spurious interference.
  • Showcased the ability to measure multiple optical components using a single metrology setup.

Conclusions:

  • Digitally enhanced interferometry offers a robust method for signal isolation and enhanced measurement precision.
  • The degree of isolation is tunable via PRN code properties, preserving interferometric sensitivity.
  • Error reduction is inversely proportional to the PRN code length, indicating scalability.