Tektronix OI1125, Instruction Manual

Page: 22 / 88

Operating Basics
10
OI1125 E/O Transmitter Instruction Manual
If you connect fiber cores larger than 9
m
m, the transmitter may still couple light,
but the mismatch in core diameter will cause lower conversion gain and higher
insertion loss.
All OI1125 optical connectors are angled physical contact (APC) connectors for
improved return-loss performance. A keyway on the connectors ensures that the
angled connectors mate together correctly.
A short, polarization-maintaining fiber (PMF) patch cord with FC/APC
connectors is included with the transmitter. Use the patch cord when connecting
the internal laser output to the modulator laser input.
To attach a fiber optic cable with FC/APC connectors to FC/APC input
receptacles, refer to Figure 4 and do the following:
1. Unscrew the dust cover from the optical receptacle.
2. Clean your optical cables using the procedure on page 62.
3. Carefully align the keyway on the receptacle with the key on the connector.
Keyway
Key
FC/APC
Receptacle
FC/APC connector
Fiber optic cable with
FC/APC connector
Dust
cover
Figure 4: Connecting a fiber optic cable
4. Tighten the nut lightly with finger pressure only. Overtightening an optical
connector may result in degraded optical signal performance.