Fig. 4: The electrical spectra of 9.1-Gbit/s/28-GHz and 9.1-Gbit/s/24-GHz 16-QAM-OFDM (16-QAM-OFDM, 16-quadrature amplitude modulation-orthogonal frequency-division multiplexing) signals. | Communications Engineering

Fig. 4: The electrical spectra of 9.1-Gbit/s/28-GHz and 9.1-Gbit/s/24-GHz 16-QAM-OFDM (16-QAM-OFDM, 16-quadrature amplitude modulation-orthogonal frequency-division multiplexing) signals.

From: 5G wavelength-division-multiplexing-based bidirectional optical wireless communication system with signal remodulation employing cascaded reflective semiconductor optical amplifiers

Fig. 4

a The electrical spectrum of 9.1-Gbit/s/28-GHz 16-QAM-OFDM signal at λ1 wavelength, through 100-m optical wireless link and at −26.9-dBm received MMW (MMW, millimeter-wave) power. The electrical spectra of 9.1-Gbit/s/24-GHz 16-QAM-OFDM signal at λ1 wavelength in the scenarios of using (b) one RSOA (RSOA, reflective semiconductor optical amplifier) and c two RSOAs, through 100-m optical wireless link and at −27.2-dBm received MMW power.

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