Riza Nabeel A, Reza Syed Azer, Marraccini Philip J
Photonic Information Processing Systems Laboratory, The College of Optics and Photonics (CREOL), University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816-2700, USA.
Appl Opt. 2010 Dec 10;49(35):6718-25. doi: 10.1364/AO.49.006718.
To the best of our knowledge, proposed for the first time is the design of an optically broadband variable photonic delay line (VPDL) using an electronically controlled variable focus lens (ECVFL), mirror motion, and beam-conditioned free-space laser beam propagation. This loss-minimized fiber-coupled VPDL design using micro-optic components has the ability to simultaneously provide optical attenuation controls and analog-mode high-resolution (subpicoseconds) continuous delays over a moderate (e.g., <5 ns) range of time delays. An example VPDL design using a liquid-based ECVFL demonstrates up to a 1 ns time-delay range with >10 dB optical attenuation controls. The proposed VPDL is deployed to demonstrate a two-tap RF notch filter with tuned notches at 854.04 and 855.19 MHz with 22.6 dB notch depth control via VPDL attenuation control operations. The proposed VPDL is useful in signal conditioning applications requiring fiber-coupled broadband light time delay and attenuation controls.
据我们所知，首次提出了一种光学宽带可变光子延迟线（VPDL）的设计，该设计使用电控可变焦距透镜（ECVFL）、镜面运动和光束条件自由空间激光束传播。这种使用微光学元件的损耗最小化光纤耦合VPDL设计能够在适度（例如，<5 ns）的时间延迟范围内同时提供光衰减控制和模拟模式高分辨率（亚皮秒）连续延迟。一个使用基于液体的ECVFL的VPDL设计示例展示了高达1 ns的时间延迟范围以及>10 dB的光衰减控制。所提出的VPDL被用于演示一个双抽头射频陷波滤波器，通过VPDL衰减控制操作，在854.04和855.19 MHz处具有调谐陷波，陷波深度控制为22.6 dB。所提出的VPDL在需要光纤耦合宽带光时间延迟和衰减控制的信号调节应用中很有用。
