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Using Laser Source Modules
How to Use Laser Source Modules
indicated by Modulation Frequency parameter, [MOD FRQ]. The
modulated outputis a square wave, with a duty cycle of 50%.
If <OFF> is displayed, the laser source outputs an unmodulated
continuous-wave signal.
NOTE If you choose to output both wavelengths of the HP 81554SM Dual
Wavelength Laser Source and to modulate the optical output signal, the
two signals will be 180° out of phase with each other.
How to Modulate the Output Signal
This parameter sets the frequency of modulation for a laser source
module. The signal is internally modulated at this frequency if the
Modulation Source parameter, [M
OD SRC], is <ON>.
To modulate the optical output at a frequency of 2 kHz:
1 Move to the laser source channel and press the [Details] softkey.
2 Move to the [MOD FRQ] parameter and press ENTER.
3 Enter 2.000 and press ENTER.
4 Move to the [MOD SRC] parameter and press ENTER.
5 Move to <INTERNAL>, by using the cursor key, and press ENTER.
6 Enable the laser output, by pressing the ACTIVE hardkey on the
module’s front panel.
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