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Related Concept Videos

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Related Experiment Video

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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station
05:57

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Published on: April 1, 2020

Internally sensed optical phased array.

David J Bowman1, Malcolm J King, Andrew J Sutton

  • 1Department of Quantum Science, College of Physical and Mathematical Sciences, Australian National University, Acton, Australia.

Optics Letters
|April 3, 2013
PubMed
Summary
This summary is machine-generated.

This study presents a novel method for optical phased arrays, eliminating the need for external components. It uses pseudo-random noise phase modulation and heterodyne interferometry to actively stabilize optical path lengths against disturbances.

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Area of Science:

  • Optics and Photonics
  • Array Signal Processing

Background:

  • Phased array techniques are difficult to extend to optical frequencies due to short wavelengths and precise path length stabilization requirements.
  • Real-world conditions like thermal and vibrational changes introduce significant path length variations, complicating optical phased array operation.
  • Previous methods relied on external mechanisms for sensing and compensating beam path variations.

Purpose of the Study:

  • To propose and demonstrate a self-contained method for optical phased arrays that compensates for path length variations without external components.
  • To overcome the challenges of stabilizing optical path lengths in phased arrays under real-world environmental disturbances.

Main Methods:

  • A novel approach combining pseudo-random noise (PN) phase modulation with heterodyne interferometry.
  • Simultaneous measurement of phase variations between multiple optical emitters.
  • Real-time feedback control of relative phases to compensate for disturbances.

Main Results:

  • Demonstration of a method that actively compensates for optical path length variations.
  • Successful stabilization of relative phases between emitters without external sensing or compensation mechanisms.
  • Experimental validation of the proposed technique's viability.

Conclusions:

  • The developed method offers a robust and self-contained solution for optical phased arrays.
  • This technique effectively mitigates environmental disturbances impacting optical path lengths.
  • The findings pave the way for more practical and stable optical phased array systems.