How to Set the Power Tunable Lasers
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 121
3 Move to one of the following menu items:
– <On>, to enable the dark position, or
– <Off>, to disable the dark position
4 Press Enter to return to the Menu screen.
5 Press [Close] to exit from the Menu screen.
The Analog Output
If there is an output BNC connector on the front panel of your Tunable
Laser module, you can output a DC voltage level that is proportional to
the laser output power. The relationship between this voltage level and
the output power is not calibrated.
Attenuator If your Tunable Laser module has an attenuator installed, the Analog
Output signal depends on the power mode you have chosen. The
voltage level is proportional to the optical power produced by the laser
diode (not the optical output power).
In <Manual Att.> Mode, the relationship between the power value, [P],
and the voltage level is only proportional to the output power if the
attenuation remains constant. The attenuator adds a constant offset to
the voltage level.
In <Automatic> Attenuation Mode, the laser output power, and
therefore the Analog Output signal, is not linearly proportional to the
output power. This is because the actual output optical power is
derived by the optimum combination of the laser output power and
the attenuation.
To set the power to −10 dBm:
Figure 67 Output Power and the Analog Output in <M
ANUAL ATT.> Mode
Vo l t a g e , V
[P], mW
5 V
20 mW
2 mW
[A
TTEN.] = 0 dB[ATTEN.] = 10 dB
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