An all-photonic approach of microwave waveforms generation and transformation is proposed and experimentally demonstrated. From the perspective of envelope function operation in time domain, an initial triangular waveform is transformed into square waveform and sawtooth (or reversed-sawtooth) waveform via two types of differentiators, respectively. In addition, by using a SOA as a multiplier, both bright and dark parabolic pulses are achieved, which are further transformed into sawtooth (or reversed-sawtooth) waveform by taking the first derivative operation. The feasibility of the system is verified by theoretical analysis and simulation. In experiment, all of the expected results are successfully demonstrated and agree with the theoretical analysis well. This scheme provides a novel access to implement all-optical microwave waveforms generation, transformation, signal processing and computing.
A new scheme of arbitrary microwave waveform generation based on one single-drive Mach-Zehnder modulator (MZM) is proposed. Due to the characteristic of the wavelengthdependent bias shift in a MZM, two light fields with different wavelength can carry two sets of modulation components and contribute the desired waveforms through both of the Fourier synthesis and time-domain synthesis. Thanks to plentiful and controllable harmonics generation, some challenging waveforms generation, such as parabolic waveform, sawtooth waveform and frequency doubling triangular waveform, can be achieved, which are verified by the theoretical analysis and experimental results. This method exhibits not only more flexible waveform generation ability, but also the advantages of simple configuration, easy operation and high efficiency of bandwidth utilization.
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