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Front Panel Connections and Controls
Laser out
Figure 5: OI1125 front-panel connectors
Modulator Connectors
OI1125 E/O Transmitter Instruction Manual
The front panel is functionally divided into two sections: the modulator and the
internal DFB laser. The connectors for both sections are shown in Figure 5. Use
the following descriptions to help you connect and use the transmitter in your
system.
Laser in
The modulator section has the following connectors:
MODULATOR DATA IN. This high-performance SMA connector is driven by a
user-supplied electrical data source such as a BERT pattern generator. The
Modulator Data In port is an AC-coupled connection that operates best with a
balanced input data pattern, such as a SONET data stream or PRBS test pattern.
When running high data-rate signals into this connector, use short, low-loss
cables with high frequency connectors. Tektronix recommends the SMA cable
that ships as a standard accessory with the transmitter for use with this connector.
LASER IN. This port can be driven by the internal laser or by a user-supplied
external CW laser source. For correct operation of the modulator, the optical
source must have a polarization-maintaining fiber (PMF) output and must be
connected with a PMF fiber cable, terminated with an FC/APC optical connector
keyed to the slow axis. A short PMF fiber patch cord is included as a standard
accessory, and a 2 meter PMF cable is available as an optional accessory.
MODULATOR OUT. An angled, universal optical connector is used to allow
greater flexibility in connector selection. An FC adapter is included with the
transmitter as a standard accessory. Several different optical connector adapters
are available as optional accessories. The Modulator Out Active LED illuminates
when the Modulator Bias Control loop is stable. This LED may flash momen-
tarily when either the optical or electrical inputs are first applied to the modula-
tor.
Operating Basics
Modulator
Modulator
data in
out
11
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