Fig. 4 | Nature Communications

Fig. 4

From: Programmable broadband optical field spectral shaping with megahertz resolution using a simple frequency shifting loop

Fig. 4

Demonstration of baseband RF AWG. a–c example of generation of an arbitrary waveform mapping the profile of Belledonne mountain, near Grenoble, France. a input modulation signal (light blue: amplitude, purple: phase) and output time trace (blue background). b train of nine consecutive emitted waveforms (rep. rate: 84.91 MHz). For clarity, the temporal scale has been shifted by 3.77 µs. c comparison of a single output waveform to the desired profile. d–f examples of ~100 ns long arbitrary waveforms with various shapes (sinc2, triangular and flat-top, and a linear ramp). The FSL is implemented such as: fs = 9.482 MHz. The maximum signal bandwidth is limited by the 3.5 GHz detection bandwidth. g–i broadband baseband AWG (sinc2, broken lines profile, and on-off keying modulation for digital communications at 8 Gbits/s (“0100011010100011” in Binary, corresponding to “46A3” in Hex.). The orange plots correspond to the target waveforms. The FSL is implemented such as fs = 84.91 MHz. The maximum signal bandwidth is 25 GHz, limited by the detection equipment

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