Title :
Photonic Generation of Phase-Coded Microwave Signal With Large Frequency Tunability
Author :
Li, Ze ; Li, Wangzhe ; Chi, Hao ; Zhang, Xianmin ; Yao, Jianping
Author_Institution :
Microwave Photonics Res. Lab., Univ. of Ottawa, Ottawa, ON, Canada
fDate :
6/1/2011 12:00:00 AM
Abstract :
A photonic approach to realizing phase-coded microwave signal generation with large frequency tunability is proposed and demonstrated. Two coherent optical wavelengths are generated based on external modulation by biasing a Mach-Zehnder modulator (MZM) at the minimum transmission point to generate ±1 -order sidebands while suppressing the optical carrier. The two ±1-order sidebands are then sent to a fiber Sagnac interferometer (SI) incorporating an optical phase modulator (PM) and a broadband flat-top fiber Bragg grating (FBG), with one of the sidebands being phase modulated at the PM. A frequency tunable phase-coded microwave signal is generated by beating the two sidebands at a photodetector (PD). The proposed technique is experimentally investigated. The generation of a frequency tunable phase-coded microwave signal at 22 and 27 GHz is demonstrated.
Keywords :
Bragg gratings; Mach-Zehnder interferometers; Sagnac interferometers; light coherence; microwave generation; microwave photonics; optical modulation; optical tuning; phase modulation; Mach-Zehnder modulator; broadband flat-top fiber Bragg grating; coherent optical wavelengths; fiber Sagnac interferometer; frequency 22 GHz; frequency 27 GHz; frequency tunable phase-coded microwave signal; large frequency tunability; minimum transmission point; optical carrier; optical phase modulator; phase-coded microwave signal generation; photodetector; photonic generation; Amplitude modulation; Microwave amplifiers; Microwave circuits; Microwave filters; Microwave photonics; Optical reflection; Microwave signal generation; phase coding; radar pulse compression;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2132121
