How to Modulate a Signal Tunable Lasers
Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition 133
How to Modulate a Signal
NOTE The signal modulation feature is not available when Auto Cal Off is
selected.
There are two ways of modulating the amplitude of the optical output.
• Using the internal modulation, and
• using external modulation.
How to Use the Internal Modulation
The internal modulation is a square wave with a 50% duty cycle. You
can set both the amplitude and the frequency of this signal. The
amplitude is set by the power parameter. This is the maximum output
power of the output signal; at the minimum output power, no power is
output.
How to Set the Output Power of a Modulated Signal
To set the output power to 555.000 µW:
1 Move to the Tunable Laser channel and press [Details] softkey.
2 Move to the power parameter, [P], and press [Pwr unit].
3 Move to <W>, by using the cursor key, and press Enter.
4 Press Enter to start editing the output power value.
5 Enter 555.000, press [Unit+] or [Unit−], as required, to select <µW>
as the power units, and press Enter.
How to Set the Frequency of a Modulated Signal
To set the frequency of the modulation to 6.500 kHz:
6 Move to the frequency parameter, [Mod Frq], press Enter.
7 Enter 6.500 press Enter.
Figure 75 The Modulated Signal
Output
Power
t
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