Laser Sources How to Use Laser Source Modules
114 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Sixth Edition
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.
Figure 61 The Modulated Signal
How to Set the Frequency of a Modulated Signal
To set the frequency of the modulation to 6.500 kHz:
1 Move to the frequency parameter, [Mod Frq], press Enter.
2 Enter 6.500 press Enter.
How to Set the Modulation Mode
3 Move to the modulation source parameter, [Mod Src], and press Enter.
4 Move to <Internal>, by using the cursor key, and press Enter. The text Int
appears in the Laser Source channel.
How to Increase Linewidth
You can use coherence control to increase the linewidth of the optical
signal output from your Agilent 8163A/B Series Laser Source module.
Enabling the coherence control increases the linewidth of the optical
output signal to between 50 and 500 MHz (typically). Coherence control
greatly reduces interference effects and therefore improves the power
stability in sensitive test setups.
To enable coherence control:
1 Move to the Laser Source channel and press [Details].
2 Move to [Mod Src] and press Enter.
3 Move to <Coherence Ctrl.>, Coherence Control, to increase linewidth.
For typical values, refer to User’s Guide for your laser source module, among the
Supplementary Performance Characteristics provided with the module’s
Specifications.
4 Press Enter. The text CC appears in the Laser Source channel.
Output
Power
t
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