ADC	Analog-to-digital converter
AM	Amplitude modulator
BEDFA	Bidirectional erbium-doped fiber amplifier
BER	Bit error rate
BS	Beam splitter
EDFA	Erbium-doped fiber amplifier
FPGA	Field-programmable gate array
GVD	Group-velocity dispersion
MEMS	Microelectromechanical system
OTDR	Optical time-domain reflectometry
PM	Phase modulator
QCKD	Quantum-Protected Control-Based Key Distribution
QRNG	Quantum random number generator
RSG	Random signal generator
WDM	Wavelength-division multiplexing