AOM	Acousto-optic modulator
ASE	Amplified spontaneous emission
BER	Bit error rate
CW	Continuous wave
CWDM	Coarse wavelength division multiplex
DP-8QAM	Dual-polarization 8 quadrature amplitude modulation
DP-QPSK	Dual-polarization quadrature phase shift keying
DWDM	Dense wavelength division multiplex
EDFA	Erbium-doped fiber amplifier
FBG	Fiber Bragg grating
GMT	Greenwich mean time
GNSS	Global Navigation System Satellite
HD	High definition
IEEE	Institute of Electrical and Electronics Engineers
IPTV	Internet protocol television
UHD	Ultrahigh definition
ITU	International Telecommunication Union
NREN	National Research and Education Network
NTP	Network time protocol
OLS	Open-line system
$\mathsf{\Phi }$-OTDR	Phase-sensitive optical time domain reflectometer
pre-FEC-BER	Pre-forward error correction-bit error rate
PTP	Precision time protocol
RF	Radio frequency
SDM	Space division multiplex
SI	International System of Units
TAI	International atomic time
TIC	Time interval counter
TWSTFT	Two-way satellite time and frequency transfer
USA	United States of America
UDP	User datagram protocol
UTC	Coordinated universal time
VoD	Video on demand
VLBI	Very-long-baseline interferometry
WDM	Wavelength division multiplexing
WR	White Rabbit