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

Wang, Chao and Yao, Jianping (2009) 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. Journal of Lightwave Technology, 27 (16). pp. 3336-3341. ISSN 0733-8724. (doi:https://doi.org/10.1109/JLT.2008.2010561) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1109/JLT.2008.2010561

Abstract

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.

Item Type: Article
Uncontrolled keywords: INSPEC: CONTROLLED INDEXING Bragg gratings chirp modulation dispersive media microwave photonics mirrors optical fibre filters optical pulse generation optical pulse shaping optical tuning photodetectors reflectivity INSPEC: NON CONTROLLED INDEXING Sagnac loop mirror chirped fiber Bragg grating chirped microwave pulse generation dispersive element fiber-optic spectral filter high-speed photodector linear wavelength-to-time mapping optical power spectrum optical spectral shaping reflection spectral response tunable chirp profile ultrashort optical pulse shaping AUTHOR KEYWORDS Chirped microwave pulse Sagnac loop mirror dispersion fiber Bragg grating (FBG) optical pulse shaping wavelength-to-time mapping
Subjects: T Technology
Divisions: Faculties > Sciences > School of Engineering and Digital Arts
Faculties > Sciences > School of Engineering and Digital Arts > Broadband & Wireless Communications
Depositing User: Tina Thompson
Date Deposited: 28 Oct 2013 15:28 UTC
Last Modified: 30 Oct 2013 10:30 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/35722 (The current URI for this page, for reference purposes)
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