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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 26,
  • Issue 15,
  • pp. 2764-2773
  • (2008)

Dual-Frequency Laser at 1.5 µm for Optical Distribution and Generation of High-Purity Microwave Signals

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Abstract

We describe the stabilization of the beatnote of an Er,Yb:glass dual-frequency laser at 1.5 <i>µ</i>m with and without an external microwave reference. In the first case, a classical optical phase-locked loop (OPLL) is used, and absolute phase noise levels as low as -117 dBrad<sup>2</sup>/Hz at 10 kHz from the carrier are reported. In the second case one or two fiber-optic delay lines are used to lock the frequency of the beatnote. Absolute phase noise levels as low as -107 dBrad<sup>2</sup>/Hz at 10 kHz from the carrier are measured, fairly independant of the beatnote frequency varying from 2 to 6 GHz. An analysis of the phase noise level limitation is presented in the linear servo-loop theory framework. The expected phase noise level calculated from the measurement of the different noise sources fits well with the predictions.

© 2008 IEEE

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