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7-4
Definition of Terms
Sensitivity
Selectivity
Input Power
Maximum
Number of
Lines Input
Input Return
Loss
Flatness refers to the maximum amplitude error in a
measurement between two lines that are separated in
wavelength by no more than the specified amount.
Linearity indicates the maximum power error in mea-
suring the change in power of one laser line.
Polarization Dependence indicates the maximum dis-
played power variation as the polarization of the input
signal is varied.
Display Resolution indicates the minimum incremen-
tal change in displayed power.
Sensitivity is defined as the minimum power level of a
single laser-line input to measure wavelength and
power accurately. A laser line with less than the mini-
mum power may be measured but with reduced wave-
length and power accuracy. For multiple laser-lines
input, sensitivity may be limited by total input power.
Selectivity indicates the ability to measure the wave-
length and power of a weak laser line in the proximity of
a specified stronger laser line and separated by the
specified amount.
Maximum displayed level indicates the maximum
total input power (total of all laser lines present) to
accurately measure wavelength and power.
Maximum safe input power indicates the maximum
total input power (total of all laser lines present) to
avoid permanent optical damage to the instrument.
Maximum number of lines input is the maximum
number of displayed lines. If more than 200 lines are
input, only the 200 longest wavelength lines are dis-
played.
Input Return Loss indicates the optical power
reflected back to the user's fiber cable relative to the
input power. It is limited by the return loss of the front-
panel connector, and assumes the user's connector is
good.
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