Simultaneously Generating Multiple Chirped Microwave Pulses With Superimposed FBGs

摘要

We demonstrate simultaneous generation of two different chirped microwave waveforms using an optical spectral shaper based on two superimposed linearly chirped fiber Bragg gratings in a Sagnac loop and wavelength-to-time mapping. By tuning the delay time in the Sagnac loop, we can simultaneously tune the central frequency of both waveforms and change the sign of the RF chirp for both waveforms together, from a negative chirp to a V-shape with both positive and negative chirps to a positive chirp.