Glossary
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IQ-2600B
CW
Abbreviation for continuous wave. Refers to non-modulated,
constant-intensity light.
CR
Coupling ratio
dB
Decibel
dBm
Decibel referenced to a milliwatt.
DC
Direct current
decibel (dB)
The standard unit used to express gain or loss of optical
power. A standard logarithmic unit for the ratio of two
powers.
DFB
Distributed feedback (laser)
diffraction grating
An optical element that causes a wavelength-dependent
reflection, often at one or more wavelength-dependent
angles. This element is based upon coherent scattering from
an array of fine, parallel, equally spaced reflecting or
transmitting lines.
directivity
In a 3-port optical circulator, the ratio of power launched
into port 1 that exits via port 2 vs. the fraction that exits via
port 3.
distributed feedback
laser (DFB)
An injection laser diode that has a Bragg reflection grating in
the active region to suppress multiple longitudinal modes
and enhance a single-longitudinal mode.
DUT
Device under test
DWDM
Dense wavelength division multiplexing
dynamic range
Another commonly used term for “optical rejection ratio” in
an optical system. See this term.
EDFA
Erbium doped fiber amplifier
EDFFA
Erbium doped fluoride fiber amplifier
EDFSA
Erbium doped silica fiber amplifier
EIA
Electronics Industries Association
EL
Excess loss
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