A coupled optoelectronic oscillator with three resonant cavities

• Published in: Optoelectronics letters 2015, Vol.11 (1), p.26-29
• Main Author: 单媛媛 江阳 白光富 马闯 李红霞 梁建惠
• Format: Article
• Language: English
• Subjects: Lasers; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; 光电反馈; 光电器件; 光电振荡器; 光纤激光器; 回路配置; 振荡信号; 调制器; 谐振腔
• ISSN: 1673-1905; 1993-5013
• DOI: 10.1007/s11801-015-4194-z

A new single-mode optoelectronic oscillator（OEO） with three coupled cavities is proposed and demonstrated. A Fabry-Perot（F-P） cavity fiber laser and an optical-electrical feedback branch are coupled together to construct an optoelectronic oscillator, where the F-P cavity fiber laser serves as a light source, and a modulator is placed in the laser cavity to implement reciprocating modulation, which simultaneously splits the laser cavity into two parts and forms a dual-loop configuration. To complete an optoelectronic oscillator, part of optical signal is output from the F-P cavity to implement the feedback modulation, which constructs the third cavity. Since only the oscillation signal satisfies the requirements of all the three cavities, a single-mode oscillation can be finally achieved. Three resonant cavities are successfully designed without adding more optoelectronic devices, and the side-modes can be well suppressed with low cost. The oscillation condition is theoretically analyzed. In the experimental demonstration, a 20 GHz single longitudinal mode microwave signal is successfully obtained.