Abstract

We demonstrate serrodyne frequency shifting of light from 200MHzto1.2GHz 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 1.6GHz and +1.6GHz. Compared with competing technologies, this technique is simple and robust, and it offers the largest available tuning range in this frequency band.

© 2010 Optical Society of America

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