Abstract
We report on an opto-electronic oscillator (OEO) widely tunable from
2.5 to 5.5 GHz. It is based on an Er,Yb:glass Dual-Frequency Laser operating
at 1.53
$\mu{\rm m}$
which naturally provides an electrically-tunable beatnote. Inserted
in an optical frequency-locked loop including a long fiber delay line, the
laser beatnote reaches a spectral purity comparable to the one obtained with
classical fixed frequency OEOs. As the oscillator scheme does not require
an RF filter, the tunability is simply achieved by tuning the laser beatnote
frequency. A fine optimization of the loop has allowed reaching a -27 dBc/Hz
(respectively -108 dBc/Hz) phase noise power spectral density at 10 Hz (respectively
10 kHz) of the carrier with only 100 m optical fiber, this performance being
independent of the frequency.
© 2013 IEEE
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