Photonic generation of a linearly chirped microwave waveform with long temporal duration using a dispersive loop

Jiejun Zhang, O. Coutinho, J. Yao
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引用次数: 8

Abstract

We propose and experimentally demonstrate a photonic approach to generating a linearly chirped microwave waveform with a large time bandwidth product (TBWP) based on spectral shaping and wavelength-to-time (SS-WTT) mapping. The spectral shaping is performed using a Fabry-Perot interferometer (FPI) consisting of two linearly chirped fiber Bragg gratings (LCFBG) with complementary dispersion to produce a spectral response with a linearly increasing or decreasing free spectral range. The wavelength-to-time mapping is performed using a dispersive loop incorporating a third LCFBG. Thanks to the multiple-time use of the third LCFBG, an extremely large equivalent dispersion can be achieved, which leads to the generation of a linearly chirped microwave waveform with a long temporal duration. The proposed technique is validated by an experiment. Two linearly chirped microwave waveforms with a TBWP of 225 and a temporal duration of 25 and 45 ns are generated.
利用色散环产生具有长时间持续时间的线性啁啾微波波形
我们提出并实验证明了一种基于频谱整形和波长-时间(SS-WTT)映射的光子方法来产生具有大时间带宽积(TBWP)的线性啁啾微波波形。光谱整形使用由两个互补色散的线性啁啾光纤布拉格光栅(LCFBG)组成的法布里-珀罗干涉仪(FPI)进行,以产生自由光谱范围线性增加或减少的光谱响应。波长-时间映射是使用一个色散环路结合第三个LCFBG来完成的。由于多次使用第三个LCFBG,可以实现极大的等效色散,从而产生具有长时间持续时间的线性啁啾微波波形。实验验证了该方法的有效性。产生了两个线性啁啾微波波形,TBWP为225,时间持续时间为25和45 ns。
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