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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 32,
  • Issue 20,
  • pp. 3690-3694
  • (2014)

A Feedback Control Loop for Frequency Stabilization in an Opto-Electronic Oscillator

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Abstract

A new method for the long-term frequency stabilization of an opto-electronic oscillator (OEO) is proposed. All existing methods are based on the precise temperature stabilization of specific components of an OEO, for example, the optical fiber and the microwave band-pass filter. We propose a new method based on a feedback control loop that detects the oscillator frequency using a frequency discriminator and modifies the laser wavelength to keep the oscillator frequency constant using the fiber chromatic dispersion. With the proposed method we achieved a frequency-temperature coefficient of 0.2 ppm/K. Unlike previous methods, our method also compensates the effects of other unstabilized OEO components on the OEO's frequency. Other benefits are that there is no need for an accurate temperature stabilization of the optical fiber and mode hopping is prevented.

© 2014 IEEE

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