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Proceedings Paper

10 GHz dual loop opto-electronic oscillator without RF-amplifiers
Author(s): Weimin Zhou; Olukayode Okusaga; Craig Nelson; David Howe; Gary Carter
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Paper Abstract

We report the first demonstration of a 10 GHz dual-fiber-loop Opto-Electronic Oscillator (OEO) without RF-amplifiers. Using a recently developed highly efficient RF-Photonic link with RF-to-RF gain facilitated by a high power laser, highly efficient optical modulator and high power phototectectors, we have built an amplifier-less OEO that eliminates the phase noise produced by the electronic amplifier. The dual-loop approach can provide additional gain and reduce unwanted multi-mode spurs. However, we have observed RF phase noise produced by the high power laser include relative intensity noise (RIN) and noise related to the laser's electronic control system. In addition, stimulated Brillouin scattering limits the fiber loop's length to ~2km at the 40mW laser power needed to provide the RF gain which limits the system's quality factor, Q. We have investigated several different methods for solving these problems. One promising technique is the use of a multi-longitudinal-mode laser to carry the RF signal, maintaining the total optical power but reducing the optical power of each mode to eliminate the Brillouin scattering in a longer fiber thereby reducing the phase noise of the RF signal produced by the OEO. This work shows that improvement in photonic components increases the potential for more RF system applications such as an OEO's with higher performance and new capabilities.

Paper Details

Date Published: 12 February 2008
PDF: 6 pages
Proc. SPIE 6897, Optoelectronic Integrated Circuits X, 68970Z (12 February 2008); doi: 10.1117/12.760479
Show Author Affiliations
Weimin Zhou, Army Research Lab. (United States)
Olukayode Okusaga, Army Research Lab. (United States)
Univ. of Maryland, Baltimore County (United States)
Craig Nelson, National Institute of Standards and Technology (United States)
David Howe, National Institute of Standards and Technology (United States)
Gary Carter, Univ. of Maryland, Baltimore County (United States)

Published in SPIE Proceedings Vol. 6897:
Optoelectronic Integrated Circuits X
Louay A. Eldada; El-Hang Lee, Editor(s)

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