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

Chao Wang; Jianping Yao D.D.S.

doi:10.1117/12.779128

26 October 2007 All-optical electrical chirped pulse generation based on nonlinear wavelength-to-time conversion in a chirped fiber Bragg grating

Chao Wang, Jianping Yao D.D.S.

Author Affiliations +

Proceedings Volume 6796, Photonics North 2007; 67962K (2007) https://doi.org/10.1117/12.779128
Event: Photonics North 2007, 2007, Ottawa, Canada

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.

Citation Download Citation

Chao Wang and Jianping Yao D.D.S. "All-optical electrical chirped pulse generation based on nonlinear wavelength-to-time conversion in a chirped fiber Bragg grating", Proc. SPIE 6796, Photonics North 2007, 67962K (26 October 2007); https://doi.org/10.1117/12.779128

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