Tektronix OI1125, Instruction Manual, Page: 46 / 88

Performance Verification
34
OI1125 E/O Transmitter Instruction Manual
Internal Laser
The following procedures check the output power and wavelength of the internal
laser circuit.
CAUTION.
To prevent eye damage, always disable the laser with the front-panel
keyswitch when making optical connections.
Check the output power of the internal laser in the transmitter by doing the
following:
1. If the optical patch cord between the internal laser output and the modulator
optical input is connected, disconnect it from the front of the instrument.
2. Connect the internal laser output to the optical power meter input, using the
FC/APC-to-FC single mode cable. See Figure 12.
3. Enable the laser by turning the keyswitch clockwise (to the unlocked
position). The Laser On LED and Laser Output Active LED both light.
4. Set the power meter to display units in dBm.
5. Check that the measured optical power is within the limits on the test record,
and record the value of the measured optical power on the test record.
6. Disable the laser by turning the keyswitch counterclockwise to the locked
position. The Laser On LED and Laser Output Active LED both turn off.
OI1125
Laser out
(FC/APC)
Optical in
(FC/PC)
Laser On
LED
Laser Output
Active LED
Power meter
Optical cable
174-4727-00
Figure 12: Setup for the output power test
Output Power