Fig. 5: The bit error ratio (BER) of 64-quadrature amplitude modulation (QAM) plaintext and number of masked signals (NMS) with different oversampling ratios (OSR). | Communications Engineering

Fig. 5: The bit error ratio (BER) of 64-quadrature amplitude modulation (QAM) plaintext and number of masked signals (NMS) with different oversampling ratios (OSR).

From: Device-compatible ultra-high-order quantum noise stream cipher based on delta-sigma modulator and optical chaos

Fig. 5

a The BER of plaintext and the NMS versus OSR after quantum noise stream cipher decryption. The dotted line represents the hard-decision forward error correction (HD-FEC, −log10(BER) = 2.42) with an overhead of 7%. b Constellations of 64QAM signal with different OSRs.

Back to article page