1
You should notice that the power reading on the multimeter is approximately
half the value set on the laser source. This is because the output is modulated
by a square wave with a 50% duty cycle.
Measuring a Wavelength Characteristic
For the second part, we assume that the instruments are in the state given after
the rst task (see Figure 1-8).
We now want to measure the wavelength characteristic by measuring the power
at 1nm steps between 1535nm and 1545nm, at the highest power level possible
that is available over the full sweep range.
11.
On the laser source, press
NNNNNNNNNNNNNNNNNNNN
Mod/CW
to return the laser source to CW
operation.
Setting Up the Wavelength Sweep
12. On the laser source:
a. Press
4
WAVELENGTH
5
,and then
N
NNNNNNNNNNNNNNNNNNNNNN
-Sweep
.
b. Type in 1535 on the keypad and press
4
ENTER
5
to set the start wavelength
for the sweep.
c. Type in 1545 on the keypad and press
4
ENTER
5
to set the stop wavelength
for the sweep.
d. Type in 1 on the keypad and press
4
ENTER
5
to set the size of the
wavelength step for the sweep.
Figure 1-9.
Tunable Laser Source Display during Setting Up for the Wavelength
Sweep
Getting Started 1-11
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