Discretely programmable microwave photonic filter based on temporal Talbot effects
Discretely programmable microwave photonic filter based on temporal Talbot effects
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DOI：
10.1364/oe.27.014381
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发表时间：
2019-05-13
期刊：
影响因子：
3.8
通讯作者：
Chen, Lawrence R.
中科院分区：
文献类型：
--
作者：
Maram, Reza;Onori, Daniel;Chen, Lawrence R.
提出并实验验证了一种基于时间塔尔博特效应的可重构微波光子滤波器。微波信号首先通过电光强度调制被一串光脉冲均匀采样。然后将采样的光脉冲引导到基于Talbot的光信号处理器;由电光时间相位调制器和色散线组成。基于Talbot的微波光子滤波器（TMPF）利用塔尔博特自成像效应的固有特性来抑制光脉冲的脉冲间强度波动，从而透射某些波动频率并抑制或完全阻挡其他微波光谱分量。输出微波信号最终从处理的光脉冲中重构，并且由网络分析仪测量所得的RF响应。TMPF表现出具有周期性、椭圆曲线通带的RF响应，其中心频率和自由频谱范围（FSR）由采样率和色散值定义。滤波器通带可以在离散步骤中电气地重新配置。通过调节相位调制器的调制功能，即，而不需要手动调节光学部件。这使得能够在主通带中选择特定通带。使用任意波形发生器提供相位调制功能。具有快速调谐滤波器的光谱响应的潜力。滤波器通带的带宽也可以通过使用光学带通滤波器调节采样脉冲的时间宽度来容易地定制。各种通带配置中的滤波器性能的例子也在时域中提出，以进一步验证滤波器的操作。(C)根据OSA开放获取出版协议的条款，2019年美国光学学会
We propose and experimentally/demonstrate a reconfigurablc microwave photonic filter based on temporal Talbot effects. The microwave signal is First uniformly sampled by a train of optical pulses through clectro-optic intensity modulation. The sampled optical pulses are then directed to a Talbot-based optical signal processor; consisting of an clectro-optic temporal phase modulator and a chromatic dispersion line. The Talbot-based microwave photonic filter (TMPF) exploits the inherent properties of the Talbot self-imaging effect for mitigating pulse-to-pulse intensity fluctuations of optical pulses to transmit some fluctuation frequencies and mitigate or entirely block other microwave spectral components. The output microwave signal is finally reconstructed from the processed optical pulses and the resultant RF response is measured by a network analyzer. The TMPF exhibits an RF response with periodic, symmetric-profile passbands whose center frequency and free spectral range (FSR) are defined by the sampling rate and the dispersion value. The filter passbands can be reconfigured electrically, in discrete steps. by adjusting the modulation function of the phase modulator, i.e., without the need for manual adjustment of the optical components. This enables the capability of selection of specific passbands among the primary passbands. The phase modulation function is provided using an arbitrary waveform generator. with the potential for fast tuning of the filter's spectral response. The bandwidth of the filter passband can also be easily customized by adjusting the sampling pulse's temporal width using an optical bandpass filter. Examples of filter performance in various passband configurations are also presented in the time domain to further validate the operation of the filter. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement