HP 86037B, Instruction Manual

Page: 67 / 204

3-11
Normalization
Adjusting the Power Monitor
5 Enter 0.0 in the
Power constant
field. Click OK .
6 Press the
Local
key on the TLS (tuneable laser source) to put it in local
operation mode.
7 On the TLS, set the wavelength to 1558.5 nm and the power to 0 dBm.
8 Connect a short fiber-optic cable from the
SOURCE OUTPUT
connector to an
optical power meter. Press the
Active
key on the tuneable laser source.
9 Measure the optical power at 1558.5 nm on the power meter and record the
reading P
1
.
P
1
: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________ dBm
10 Disconnect the fiber-optic cable from the power meter and connect it to the
RECEIVER INPUT
port on the HP 83427A test set.
11 Click the
Power Monitor
button on the main window and record the power
reading P
2
.
P
2
: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________ dBm
12 Calculate the difference using the following equation:
∆
P = P
1
– P
2
P
∆
: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ____________ dBm
For example:
∆
P = (–12 dBm) – (–8 dBm)
∆
P = –4 dBm
13 Close the
Power Monitor
window.
14 Choose
Power Monitor Settings
from the
Service
menu.
15 In the
Power Monitor Setup
dialog box, enter the following values:
Power constant:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ∆
P (as calculated above)
Under range limit: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –43 dBm
Insertion loss reference: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –15 dBm
TLS power:. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 dBm
TLS wavelength: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1558.5 nm
16 Click
OK
.
17 Click the
Power Monitor
button on the main window. Verify that the displayed
power is within ±0.5 dB of value P
1
.
18 Click the
Set zero
button from within the
Power Monitor
window.
19 Close the
Power Monitor
window. The TLS automatically reverts to system