Fig. 5: The subcarrier EVMs (EVMs, error vector magnitudes) of the 9.1-Gbit/s/28-GHz (downlink) and 9.1-Gbit/s/24-GHz (uplink) 16-QAM-OFDM (16-QAM-OFDM, 16-quadrature amplitude modulation-orthogonal frequency-division multiplexing) signals. | Communications Engineering

Fig. 5: The subcarrier EVMs (EVMs, error vector magnitudes) of the 9.1-Gbit/s/28-GHz (downlink) and 9.1-Gbit/s/24-GHz (uplink) 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. 5

The subcarrier EVMs of the 9.1-Gbit/s/28-GHz (downlink) and 9.1-Gbit/s/24-GHz (uplink) 16-QAM-OFDM signals at different subcarrier indices, in the scenarios of using one RSOA (RSOA, reflective semiconductor optical amplifier) and two RSOAs. Blue triangle/line indicates 9.1-Gbit/s/28-GHz signal (λ1, 1549.3 nm; downlink), brown circle/line indicates 9.1-Gbit/s/28-GHz signal (λ2, 1550.9 nm; downlink), red rhombus/line indicates 9.1-Gbit/s/24-GHz signal (λ1, two RSOAs, uplink), black square/line indicates 9.1-Gbit/s/24-GHz signal (λ2, two RSOAs, uplink), red hollow rhombus/line indicates 9.1-Gbit/s/24-GHz signal (λ1, one RSOA, uplink), and black hollow square/line indicates 9.1-Gbit/s/24-GHz signal (λ2, one RSOA, uplink). The error bars represent the standard deviations of the measured data from three experimental trials.

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