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Linewidth
Noise
Power range
Offset
Keysight 81618A/9A and Keysight 81620B/3B/4B/6B/8B Optical Heads User's Guide
Note 2: The power-dependent nonlinearity, N(P
expressed by the following formula:
where r(P) is the power-dependent responsivity (for a power meter, the
responsivity is defined as the ratio of displayed power to actual input
power).
FWHM spectral bandwidth. The 3 dB width of the optical spectrum,
expressed in Hertz. Symbol: Δf.
The peak-to-peak change of displayed power level with zero input power
level (dark).
Conditions: Zero prior to measurement, averaging time and observation
time as specified, lowest power range selected and wavelength range as
specified.
Measurement: the measurement result is obtained by:
Noise = P
− P
expressed as peak-to-peak within the given time span.
max
min
Any offset is automatically excluded this way.
The power range is defined from the highest specified input power level to
the smallest input power level that causes a noticeable change of
displayed power level.
Conditions: wavelength, averaging time as specified.
The average power reading without incident optical power (dark).
(
) r P
(
r P
–
x
(
)
-------------------------------- -
N P
=
x
(
)
r P
0
Specifications
), can alternatively be
x
)
0
3
31
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