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Free-space optical delay interferometer with tunable delay and phase.

Jingshi Li1, Kai Worms, Ruediger Maestle

  • 1Institute of Photonics and Quantum Electronics, Karlsruhe Institute of Technology, Karlsruhe, Germany. jingshi.li@kit.edu

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|July 1, 2011
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This summary is machine-generated.

This study introduces a novel optical delay interferometer for precise signal reception. It offers polarization-insensitive operation and accurate monitoring, enhancing digital communication systems.

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Area of Science:

  • Optics
  • Optical Communications
  • Interferometry

Background:

  • Free-space optical communication systems require precise signal processing.
  • Traditional delay interferometers can suffer from polarization sensitivity.
  • Accurate monitoring of phase and time delay is crucial for signal integrity.

Purpose of the Study:

  • To report a novel free-space optical delay interferometer (DI).
  • To achieve continuously tunable time delay and polarization-insensitive operation.
  • To implement an accurate phase and time delay monitoring scheme.

Main Methods:

  • Actively mitigating polarization dependence using a birefringent liquid-crystal device.
  • Integrating a continuously tunable time delay mechanism.
  • Developing an accurate phase and time delay monitoring system.

Main Results:

  • Demonstrated polarization-insensitive operation with high extinction ratios.
  • Achieved accurate phase and time delay monitoring.
  • Successfully tested the DI for reception of D(m)PSK signals.

Conclusions:

  • The developed optical delay interferometer offers robust and precise signal reception capabilities.
  • The active polarization mitigation technique is effective.
  • The DI is suitable for advanced digital communication systems, including D(m)PSK signal reception.