DocumentCode :
780290
Title :
An Approach to Photonic Generation of High-Frequency Phase-Coded RF Pulses
Author :
Chi, Hao ; Yao, Jianping
Author_Institution :
Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ont.
Volume :
19
Issue :
10
fYear :
2007
fDate :
5/15/2007 12:00:00 AM
Firstpage :
768
Lastpage :
770
Abstract :
A novel method to generate high-frequency phase-coded RF pulses using all-fiber components is proposed. The system consists of a mode-locked fiber laser (MLFL), a dispersive element, an unbalanced Mach-Zehnder interferometer (UMZI), an optical phase modulator (PM), and a photodetector (PD). The PM is incorporated in one arm of the UMZI. In the system, an ultrashort pulse generated by the MLFL is broadened and chirped after passing through the dispersive element, which is then sent to the UMZI, to get two time-delayed chirped pulses. By beating the time-delayed chirped pulses at the PD, an RF pulse with its frequency dependent on the time delay difference is obtained. The generated RF pulse can be phase coded if an encoding signal is applied to the PM. A theoretical model is presented which is verified by experiments. The generation of RF pulses with binary phase coding is also experimented
Keywords :
Mach-Zehnder interferometers; chirp modulation; delays; fibre lasers; microwave photonics; optical modulation; optical pulse generation; phase coding; phase modulation; photodetectors; RF pulse generation; fiber laser; laser mode locking; optical phase modulator; phase coding; photodetector; time-delayed chirped pulses; unbalanced Mach-Zehnder interferometer; Chirp; Dispersion; Fiber lasers; Laser mode locking; Optical interferometry; Optical modulation; Optical pulse generation; Phase modulation; Pulse generation; Radio frequency; Microwave photonics; RF signal generation; mode-locked fiber laser (MLFL); phase coding; phase modulation;
fLanguage :
English
Journal_Title :
Photonics Technology Letters, IEEE
Publisher :
ieee
ISSN :
1041-1135
Type :
jour
DOI :
10.1109/LPT.2007.895898
Filename :
4156229
Link To Document :
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