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Appendix C: Acronyms
(continued)
MZI
Mach-Zehnder interferometer
MZM
Mach-Zehnder modulator
NA
Numerical aperture
NF
Noise figure
NIST
National Institute of Standards and Technology
NMS
Network management system
NPL
National Physical Laboratory
NRZ
Nonreturn-to-zero
NZDSF
Non-zero dispersion-shifted fiber
O/E/O
Optical-to-electrical-to-optical
OADM
Optical add/drop multiplexer
OBS
Optical burst switching
OC
Optical carrier
ODU
Optical channel data unit
OLS
Optical label swapping
OLT
Optical line terminal
OMA
Optical modulation amplitude
OMI
Optical modulation index
OMS
Optical multiplex section
ONT
Optical network terminal
ONU
Optical network unit
OOK
On-off keying
OPM
Optical performance monitor
OPS
Optical pulse suppressor
OPS
Optical packet switching
OPU
Optical channel payload unit
ORL
Optical return loss
OSA
Optical spectrum analyzer
OSI
Open system interconnect
OSNR
Optical signal-to-noise ratio
OST
Optical standards tester
OTDM
Optical time-division multiplexing
OTDR
Optical time domain reflectometer
OTN
Optical transport network
OTS
Optical transport section
OTU
Optical channel transport unit
OVPO
Outside vapor-phase oxidation
(continued)