8163A/B, 8164A/B, 8166A/B User’s Guide
141
Tunable Lasers
5
•
<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.
Figure 81
Output Power and the Analog Output in <Manual ATT.> Mode
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.
Voltage, V
[P], mW
5 V
20 mW
2 mW
[A
TTEN
.] = 0 dB
[A
TTEN
.] = 10 dB
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