Tektronix OI1125, Instruction Manual

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Operating Basics
12
OI1125 E/O Transmitter Instruction Manual
The Internal Laser section has the following connectors:
LASER OUT. The laser out connector provides the CW optical source from the
internal DFB laser. The laser output is polarized for use by the modulator input
and is sourced from an FC/APC connector. A PMF fiber cable must be used for
this connection. If the internal laser is used as the optical source for the
modulator, then use the PM jumper included with the transmitter.
The Internal Laser Active LED illuminates under the following conditions:
H
The Internal Laser Off/On keyswitch is in the on position.
H
The Laser Safety Interlock is attached to the rear-panel connector.
H
The internal laser power and wavelength control feedback is stable.
When you power on the transmitter, the Internal Laser Active LED may flash
momentarily while the internal laser power level and temperature stabilize. This
LED may also flash momentarily when you adjust the internal laser wavelength.
Wavelength
adjust Wavelength
adjust enable
Extinction
ratio adjust
Extinction
ratio adjust
enable
Remote
enable Internal laser
on/off
Figure 6: OI1125 front-panel controls
Use Figure 6 with the following descriptions of the front-panel controls.
There are two controls in the modulator section on the front panel of the
OI1125. The controls are described below.
Extinction Ratio Adjust Enable.
This momentary pushbutton switch allows you to
switch between two modes of operation. When the switch is in the disabled
mode, the enable LED is not lighted, and the calibrated extinction ratio setting is
selected. This is the default mode when the instrument is powered on.
Internal Laser Connectors
Modulator Controls