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N OT E
Using Laser Source Modules
How to Use Laser Source Modules
indicated by Modulation Frequency parameter, [M
modulated outputis a square wave, with a duty cycle of 50%.
If <O
> is displayed, the laser source outputs an unmodulated
FF
continuous-wave signal.
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
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 [M
3 Enter 2.000 and press E
4 Move to the [M
5 Move to <I
6 Enable the laser output, by pressing the A
module's front panel.
93
OD
F
] parameter and press E
OD
RQ
.
NTER
S
] parameter and press E
OD
RC
>, by using the cursor key, and press E
NTERNAL
F
]. The
OD
RQ
S
], is <O
>.
RC
N
.
NTER
.
NTER
hardkey on the
CTIVE
.
NTER
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