Department of Physics, Stanford University, Stanford, California 94305, USA.
Opt Lett. 2010 Mar 1;35(5):745-7. doi: 10.1364/OL.35.000745.
We demonstrate serrodyne frequency shifting of light from 200 MHz to 1.2 GHz with an efficiency of better than 60%. The frequency shift is imparted by an electro-optic phase modulator driven by a high-frequency high-fidelity sawtooth waveform that is passively generated by a commercially available nonlinear transmission line. We also implement a push-pull configuration using two serrodyne-driven phase modulators, allowing for continuous tuning between -1.6 GHz and +1.6 GHz. Compared with competing technologies, this technique is simple and robust, and it offers the largest available tuning range in this frequency band.
我们展示了从 200MHz 到 1.2GHz 的光的外差频率移动，效率超过 60%。这种频率移动是由电光相位调制器施加的，相位调制器由一个通过商业上可用的非线性传输线被动产生的高频高保真锯齿波驱动。我们还使用两个外差驱动的相位调制器实现了推挽配置，允许在-1.6GHz 和+1.6GHz 之间连续调谐。与竞争技术相比，该技术简单且坚固，并且在该频带中提供了最大的可用调谐范围。
