Ultra-Wideband Waveform Generator Based on Optical Pulse-Shaping and FBG Tuning
Ultra-Wideband Waveform Generator Based on Optical Pulse-Shaping and FBG Tuning
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基于光脉冲整形和FBG调谐的超宽带波形发生器
DOI：
10.1109/lpt.2007.912523
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发表时间：
2008
影响因子：
2.6
通讯作者：
Sophie LaRochelle
中科院分区：
文献类型：
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作者：
M. Abtahi;M. Mirshafiei;J. Magné;L. A. Rusch;Sophie LaRochelle
我们提出并通过实验演示了一种基于光脉冲整形的超宽带（UWB）波形发生器原型。时域脉冲形状写入频域，单模光纤执行频率到时间的转换。光纤布拉格光栅 (FBG) 在频域中刻画出符合美国联邦通信委员会 (FCC) 标准的高能效脉冲形状，优化脉冲与测量脉冲之间具有出色的匹配性。另外两种流行的 UWB 脉冲形状（高斯单周期脉冲和双峰脉冲）是通过适当调谐两个基于 FBG 的可变光学滤波器来实现的。平衡光电探测器消除了叠加在所需波形上的不需要的矩形脉冲，确保低频下的合规性。
We propose and demonstrate experimentally a prototype for ultra-wideband (UWB) waveform generator based on optical pulse shaping. The time-domain pulse shape is written in the frequency domain, and a single-mode fiber performs frequency-to-time conversion. A U.S. Federal Communications Commission (FCC)-compliant power efficient pulse shape is inscribed in the frequency domain by a fiber Bragg grating (FBG) with an excellent match between optimized and measured pulses. Two other popular UWB pulse shapes (Gaussian monocycle and doublet pulses) are achieved by proper tuning of two FBG-based variable optical filters. A balanced photodetector removes an unwanted rectangular pulse superimposed on the desired waveform, assuring compliance at low frequency.