Title :
Continuously Tunable Microwave Frequency Multiplication by Optically Pumping Linearly Chirped Fiber Bragg Gratings in an Unbalanced Temporal Pulse Shaping System
Author :
Shahoei, Hiva ; Yao, Jianping
Author_Institution :
Sch. of Electr. Eng. & Comput. Sci., Univ. of Ottawa, Ottawa, ON, Canada
fDate :
6/15/2012 12:00:00 AM
Abstract :
We propose and demonstrate a new and simple method for achieving continuously tunable microwave frequency multiplication using an unbalanced temporal pulse shaping (TPS) system incorporating two linearly chirped fiber Bragg gratings (LCFBGs) written in erbium/ytterbium co-doped fibers. By optically pumping the LCFBGs with different pumping power, the dispersion of the LCFBGs is tuned. The incorporation of the LCFBGs in an unbalanced TPS system would enable the generation of a frequency tunable microwave waveform. The operation of the system is discussed which is then verified by an experiment. Continuously tunable microwave frequency multiplication with a multiplication factor from 5.14 to 11.9 is experimentally demonstrated. The impact of the ripples in the magnitude and group delay responses of the LCFBGs on the performance of the microwave generation is also studied.
Keywords :
Bragg gratings; erbium; microwave generation; optical fibres; optical frequency conversion; optical pulse shaping; ytterbium; continuously tunable microwave frequency multiplication; group delay responses; linearly chirped fiber Bragg gratings; microwave generation; multiplication factor; optical pumping; unbalanced temporal pulse shaping system; Bandwidth; Delay; Erbium; Optical fiber dispersion; Optical pulses; Reflection; Frequency multiplication; linearly chirped fiber Bragg grating (LCFBG); real-time Fourier transform; temporal pulse shaping (TPS);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2012.2190581
