Keysight Technologies 86120B, User Manual

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43
Using the Multi-Wavelength Meter
Displaying Wavelength and Power
Total power and average wavelength
In the third available display mode, the Agilent 86120B displays the average wave-
length as shown in the following figure. The displayed power level is the total input
power to the instrument. It is the sum of the powers of each laser line; it is
not a
measure of the average power level of the laser lines.
The following equation shows how individual wavelengths of laser lines are
summed together to obtain the average wavelength value:
where,
n is the number of laser lines included in the average.
P
i
is the peak power of an individual laser line. Power units are in Watts (linear).
The following equation shows how individual powers of laser lines are summed
together to obtain the total power value:
where,
n is the number of laser lines included in the measurement.
P
i
is the peak power of an individual laser line. Power units are in Watts (linear).
λ
avg
P
i
λ
i
i 1 =
n

P
i
i 1 =
n

--------------------
=
P
total
P
i
i 1 =
n

=