Abstract
A novel all-optical technique based on the incoherent processing of optical signals using high-order dispersive elements is analyzed for microwave arbitrary pulse generation. We show an approach which allows a full reconfigurability of a pulse in terms of chirp, envelope and central frequency by the proper control of the second-order dispersion and the incoherent optical source power distribution, achieving large values of time-bandwidth product.
Highlights
Assisted Arbitrary Waveform Generation (AWG) allows frequency operation ranges of tens of GHz in contrast with pure electronic systems restricted close to 10 GHz
A great number of approaches related to microwave AWG in the optical domain have been proposed including direct spaceto-time pulse shaping, temporal pulse shaping, optical spectral shaping combined with frequency-to-time mapping [3], optical line-by-line intensity and phase modulation [4], incoherent pulse shaping [5, 6] and microwave photonic filtering [7]
In order to increase the waveform flexibility, we recently proposed a photonic scheme that allows both optical arbitrary waveform generation and large time-bandwidth product (TBWP) by the processing of an incoherent optical signal using a nonlinear dispersive element which experimental results were reported in [15]
Summary
Assisted Arbitrary Waveform Generation (AWG) allows frequency operation ranges of tens of GHz in contrast with pure electronic systems restricted close to 10 GHz. A coherent nonlinear frequency-to-time mapping in a highorder dispersive element was proposed [11, 12] In this case, TBWP depends on the secondorder dispersion so this technique is experimentally limited to a TBWP value of 4. In order to increase the waveform flexibility, we recently proposed a photonic scheme that allows both optical arbitrary waveform generation and large TBWP by the processing of an incoherent optical signal using a nonlinear dispersive element which experimental results were reported in [15]. Which operates as an incoherent nonlinear frequency-to-time mapping system where a full reconfigurability can be achieved by controlling the optical source power distribution with a chirp value depending on the second-order dispersion. The use of realistic parameters corresponding to commercial devices allows to obtain TBWP value around 90
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