Figure A1
From: Vector—towards quantum key distribution with small satellites
The dependencies of bit error probability on comparator level obtained at different levels of optical power. The bit rate is 100 Mbit/s. Data encoding is implemented by means of an electro-optical modulator. A single point presents data averaged over 104 packets or 2.568×107 bits. Vertical dashed line indicates the comparator level that provides the lowest BER