Fig. 3: The connected constellation diagrams and eye patterns of 10-Gbps/38-GHz and 1-Gbps/4.4-GHz (y-polarisation; downstream), as well as 10-Gbps/26-GHz and 1-Gbps/3.7-GHz (x-polarisation; upstream) signals. | Communications Engineering

Fig. 3: The connected constellation diagrams and eye patterns of 10-Gbps/38-GHz and 1-Gbps/4.4-GHz (y-polarisation; downstream), as well as 10-Gbps/26-GHz and 1-Gbps/3.7-GHz (x-polarisation; upstream) signals.

From: Two-way free-space optics-based interface between fibre and 5G communication employing polarisation-orthogonal modulation

Fig. 3

The associated constellation diagrams and eye patterns (in-phase component) of a 10-Gbps/38-GHz and b 1-Gbps/4.4-GHz 16-QAM-OFDM (16-QAM-OFDM, 16-quadrature amplitude modulation-orthogonal frequency-division multiplexing) signals (y-polarisation; downstream) at 3.8 × 10−3 BER (BER, bit error rate). The correlated constellation diagrams and eye patterns (in-phase component) of c 10-Gbps/26-GHz and d 1-Gbps/3.7-GHz 16-QAM-OFDM signals (x-polarisation; upstream) at 4.7 × 10−5 BER.

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