We successfully demonstrate an optoelectronic oscillator (OEO) low radio-frequency- (RF)-threshold gain and a low level of spurious tones using semiconductor lasers under optical injection in dual fiber-loop configuration. Our 15-GHz OEO exhibits spurious tones suppressed over 70 dB by dual-loop modulation, maintaining a low RF-threshold gain of 27 dB and phase noise of 104 dBc/Hz at 10-kHz frequency offset.
Bibliographical noteFunding Information:
Manuscript received November 22, 2011; revised February 2, 2012; accepted February 2, 2012. Date of publication February 10, 2012; date of current version March 30, 2012. This work was supported in part by KESRI 2010T100100855, which is funded by the Ministry of Knowledge Economy, and in part by the National Research Foundation of Korea under the Basic Science Research Program 2011-0009493.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering