Chirped Microwave Pulse Generation Based on Optical Spectral Shaping and Wavelength-to-Time Mapping Using a Sagnac Loop Mirror Incorporating a Chirped Fiber Bragg Grating

In this paper, we propose and demonstrate an approach to optically generating chirped microwave pulses with tunable chirp profile based on optical spectral shaping using a Sagnac loop filter incorporating a chirped fiber Bragg grating (CFBG) and linear wavelength-to-time mapping in a dispersive elem...

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Bibliographic Details
Published in:Journal of lightwave technology 2009-08, Vol.27 (16), p.3336-3341
Main Authors: Chao Wang, Chao Wang, Jianping Yao, Jianping Yao
Format: Article
Language:English
Subjects:
Bragg gratings
Chirp
Chirped microwave pulse
Dispersion
fiber Bragg grating (FBG)
High speed optical techniques
Mapping
Mathematical models
Microwave generation
Microwaves
Mirrors
Optical fibers
Optical filters
Optical pulse generation
Optical pulse shaping
Optical pulses
Pulse generation
Sagnac interferometers
Sagnac loop mirror
Spectral lines
wavelength-to-time mapping
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Summary:In this paper, we propose and demonstrate an approach to optically generating chirped microwave pulses with tunable chirp profile based on optical spectral shaping using a Sagnac loop filter incorporating a chirped fiber Bragg grating (CFBG) and linear wavelength-to-time mapping in a dispersive element. In the proposed approach, the optical power spectrum of an ultrashort optical pulse is shaped by a CFBG-incorporated Sagnac loop mirror that has a reflection spectral response with a linearly increasing or decreasing free spectral range. The spectrum-shaped optical pulse is then sent to a dispersive element to perform the linear wavelength-to-time mapping. A chirped microwave pulse with the pulse shape identical to that of the shaped spectrum is obtained at the output of a high-speed photodector. The central frequency and the chirp profile of the generated chirped microwave pulse can be controlled by simply tuning the time delay in the Sagnac loop mirror. A simple mathematical model to describe the chirped microwave pulse generation is developed. Numerical simulations and a proof-of-principle experiment are implemented to verify the proposed approach.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2008.2010561