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Proceedings Paper

All-optical electrical chirped pulse generation based on nonlinear wavelength-to-time conversion in a chirped fiber Bragg grating
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Paper Abstract

In this paper, we propose and demonstrate a novel approach to optically generating chirped microwave pulse with tunable chirp rate based on spectral shaping and nonlinear wavelength-to-time conversion using a tunable nonlinearly chirped fiber Bragg grating (NL-CFBG). In our approach, the optical power spectrum of a ultrashort pulse from a femtosecond pulsed laser (FSPL) is shaped by a two-tap Sagnac loop filter (SLF) that has a sinusoidal spectral response. The spectrum shaped pulse is then reflected by an appropriately designed NL-CFBG to perform the nonlinear wavelength-to-time mapping. The microwave pulse with a tunable chirp rate is then generated at the output of a high-speed photodector (PD). The NL-CFBG used in the system is produced from a regular linearly chirped fiber Bragg grating (LCFBG) using a new technique based on strain-gradient beam tuning. A simple mathematical model to describe the chirped pulse generation is developed. A proof-of-principle experiment based on the proposed method is carried out.

Paper Details

Date Published: 26 October 2007
PDF: 5 pages
Proc. SPIE 6796, Photonics North 2007, 67962K (26 October 2007);
Show Author Affiliations
Chao Wang, Univ. of Ottawa (Canada)
Jianping Yao D.D.S., Univ. of Ottawa (Canada)

Published in SPIE Proceedings Vol. 6796:
Photonics North 2007
John Armitage, Editor(s)

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