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Photonic Generation of Microwave Signals Based on Pulse Shaping

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3 Author(s)
Hao Chi ; Sch. of Inf. Technol. & Eng., Univ. of Ottawa, Ont. ; Fei Zeng ; Jianping Yao

A novel approach to generating microwave signals based on optical pulse shaping is proposed and experimentally demonstrated. The proposed system consists of a femtosecond pulse laser source, a Sagnac-loop filter (SLF), a dispersive element, and a photodetector. The spectrum of the femtosecond pulse is shaped by the SLF that has a sinusoidal spectral response. Thanks to the frequency-to-time conversion in the dispersive element, time-domain pulse exhibiting the shape of the optical power spectrum is obtained. Depending on the free-spectral range of the SLF and the total dispersion of the dispersive element, signals with frequencies up to terahertz can be generated. A model to describe the signal generation is developed. Experimental results agree well with the theoretical analysis

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 9 )