School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907-2035, USA.
Opt Lett. 2013 Aug 1;38(15):2735-8. doi: 10.1364/OL.38.002735.
We present a scheme to generate a 10 GHz optical frequency comb that is bandwidth reconfigurable on a time scale of tens of nanoseconds via electronic control of the drive signal to a phase modulator. When such a comb is used as the source for a radio-frequency (RF) photonic filter employing dispersive propagation, the RF filter bandwidth varies in inverse proportion to the optical bandwidth. As a result we are able to demonstrate, for the first time to our knowledge, bandwidth-reconfigurable RF filtering with transition times under 20 ns. The reconfiguration speed is determined by the response time of a programmable RF variable attenuator.
我们提出了一种方案，通过对相位调制器的驱动信号进行电子控制，在数十纳秒的时间尺度内实现带宽可重构的 10GHz 光频梳。当这样的梳状结构作为利用色散传播的射频（RF）光子滤波器的光源时，RF 滤波器带宽与光带宽成反比变化。因此，我们首次成功展示了带宽可重构的 RF 滤波，其转换时间小于 20ns。这种重构速度由可编程 RF 可变衰减器的响应时间决定。
