KI 9000 UM-10
21
DEFINITION OF TERMS
Power Meter
Power Range:
the range of input powers for which the instrument
can be used.
Maximum Input Power:
the input power not to be exceeded to avoid
destroying the instrument.
Uncertainty at Reference Conditions:
the uncertainty for the
specified set of reference conditions, which includes all uncertainties
in the calibration chain, from the national laboratory to the test meter
(connectors and test leads must be absolutely clean and undamaged).
Reference conditions are the conditions during the responsivity
calibration.
Total Uncertainty:
the uncertainty for a specified set of operating
conditions which includes noise and drift (connectors and test leads
must be absolutely clean and undamaged).
Light Source
Output Power:
the CW output power at the specified wavelength at
the end of a reference cable.
Power Uncertainty / Repeatability:
the uncertainty in power level at
the end of a reference cable.
Short / Long Term (Power) Stability:
in CW mode, the uncertainty of
the power level observed over a given time, compared to the mean
power during this time. Measured with an averaging optical power
meter, a 9/125 or 62.5 µm fiber, at constant temperature, and within a
specified temperature window.
Centre wavelength:
the wavelength representing the centre of mass
of the selected peaks
:
cw
= (1/P
º
)
(P
i
i
)
where P
i
and
i
are the power and wavelength of each spectral
component and P
o
is the total power.
Spectral Bandwidth:
FWHM (full width at half the maximum),
describes the spectral width of the half-power points of the laser,
assuming a Gaussian envelope of the spectral power distribution. The
half-power points are those where the power-spectral density is one
half of the peak amplitude of the Gaussian curve:
and
where:
center
= center wavelength of laser diode (in vacuum)
P
total
=
P
i
= total power, in watts
P
i
= power of
i
th
longitudinal mode
i
= wavelength of
i
th
longitudinal mode (in vacuum)
M
= multiplication factor; for a source with a Gaussian envelope
M
= 2.35;
for other types of spectra, use
M
= 2.35 as well.
Содержание KI 9600A-Ge
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