Fig. 6
From: Quantum dash multi-wavelength lasers for Tbit/s coherent communications and 5G wireless networks
Measured spectra (in red) with smoothing version of the results (in black) for − 3 dB and − 20 dB linewidth measurements of a 46.82639 GHz MMW signal at 300 mA (resolution bandwidth (RBW) = 51 kHz, video bandwidth (VBW) = 1 kHz) and b 47.16556 GHz MMW signal at 360 mA (RBW = 51 kKHz, VBW = 510 Hz). c Photonic mm-wave-over-fiber signal generation and data transmission using optical heterodyne and d Received PAM-4 signals’ eye diagram