EXFO T100S-HP Essential, User Manual, Page: 41 / 70

Enabling Active Wavelength Monitoring
T100S-HP User Guide 41
The following procedure explains how to perform wavelength monitoring of the T100S-
HP using a wavemeter.
Procedure 1. Configure the wavemeter remote interface with the following parameters:
• Remote: [On]
• RS-232: [On]
• Baud: [9600]
• Handshaking: [None]
2. Connect the T100S-HP DB9 serial port to the wavemeter serial port.
3. As the tunable laser acts as the controller device for the wavemeter, press the
2nd + Remote function keys at the T100S-HP front-panel and select:
RS-232 IN: [OFF]
4. Start the Feedback function by pressing the 2nd + mW/dBm keys.
5. Enter the wavelength setting at the T100S-HP front-panel.
• The T100S-HP executes the wavelength monitoring scheme (see Figure 7, p. 40 )
so that the output signal wavelength closely matches the wavelength setting.
The message
Moving…
is displayed at the front-panel indicator until the output
wavelength has reached the target value and has stabilized within wavemeter
accuracy.
To compensate for possible disturbance such as accidental vibrations, shocks,
temperature drifts, and possible malfunction of the wavemeter, the T100S-HP
performs the wavelength monitoring scheme with a 4
-
second periodicity.
• The T100S-HP front-panel display shows the tunable laser operating wavelength,
alternating with the
l FEEDBACK:ON
message to indicate that the "active
wavelength monitoring" is currently on.
If the active wavelength monitoring does not work properly, the
λ FEEDBACK:ERR
message appears, alternating with the tunable laser operating wavelength.
6. To turn off the active wavelength monitoring, press the 2nd + mW/dBm again.
The message
FEEDBACK:OFF
displays once then goes off.