Title :
Widely Tunable Opto-Electronic Oscillator Based on a Dual-Frequency Laser
Author :
Maxin, Jeremy ; Pillet, Gregoire ; Steinhausser, Bastien ; Morvan, Loic ; Llopis, Olivier ; Dolfi, Daniel
Author_Institution :
Thales Res. & Technol. France-Campus Polytech., Palaiseau, France
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 μm 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.
Keywords :
erbium; fibre lasers; laser mode locking; laser noise; laser tuning; optical delay lines; optical glass; optoelectronic devices; phase noise; phosphate glasses; ytterbium; Er,Yb:glass dual-frequency laser; P2O5:Er,Yb; electrically-tunable beatnote; frequency 10 Hz; frequency 2.5 GHz to 5.5 GHz; laser beatnote frequency; long fiber delay line; optical fiber; optical frequency-locked loop; optimization; phase noise power spectral density; size 100 m; spectral purity; tunable optoelectronic oscillator; wavelength 1.53 mum; Optical fibers; Optical noise; Optical polarization; Phase noise; Radio frequency; Dual-frequency laser; optical frequency-locked loop (OFLL); opto-electronic oscillator;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2013.2274897
