Chapter 13 - Optical Receiver
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13.2 Activating the optical input
You can activate the instruments optical input using
MODE
->
Input RF/Fiber
.
If the instrument’s optical input is activated, “FIB XXXXnm” will appear in the display. XXXXnm
stands for the wavelength set, e.g. 1310 nm. Now you can set a specific measuring range, e.g. TV.
The spectrum analyzer also uses the signal from the optical receive
r.
13.3 Setting the wavelength
As previously stated, the integrated optical receiver is not wavelength-selective. However, you must
set the wavelength used because it is required for measurement of the optical power and the optical
modulation index (OMI). The responsivity of the integrated photodiode depends on the wavelength.
Using
MODE
->
Settings
->
Wavelength LAMBDA
(second page) you can set the wavelength as
1310 nm, 1490 nm or 1550 nm.
13.4 Measuring the optical power
Optical transmission involves modulation of the intensity of the light power.
The measuring instrument measures the average optical power in dBm. This power is also
measured when the light is supplied from an unmodulated laser source. In this case, the instrument
can be used as a purely optical power measuring instrument.
Start the measurement by entering the frequency and pressing
ENTER
to confirm.