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Internal Laser Controls
Remote Mode Controls
OI1125 E/O Transmitter Instruction Manual
When the switch is in the enabled mode, the variable extinction ratio is enabled,
and the LED next to the pushbutton switch illuminates. The extinction ratio
adjust control is active in this mode. If this switch is pushed when the transmitter
is in remote mode, the LED flashes momentarily.
Extinction Ratio Adjust. This control varies the extinction ratio of the transmitter
output signal. The extinction ratio control allows you to optimize or degrade the
extinction ratio (and to some extent, the jitter and eye quality). As you turn the
control clockwise, the extinction ratio and eye pattern quality increase to an
optimum point before you reach the extreme clockwise position. When the
transmitter is in remote mode, this front-panel control is disabled.
Internal Laser controls are used to control the optical signal from the Laser Out
connector. They are described in the following text.
Internal Laser Off/On. This keyswitch turns the DFB laser on and off. The rear
panel laser safety interlock connector must be attached, or the laser disable signal
on the laser remote port must be set to a logic low for the keyswitch to work.
When you rotate the keyswitch to the counterclockwise posititon, the key can be
removed from the keyswitch to lock out operation of the internal laser.
The On LED illuminates when the keyswitch is rotated clockwise to the on
position, and the laser safety interlock is attached. The On LED flashes if the
keyswitch is rotated clockwise to the on position and the laser safety interlock
has been removed.
λ Adj Enable. Use this pushbutton switch to switch from a calibrated wavelength
to an adjustable wavelength. An LED next to the pushbutton illuminates when
the adjustment is enabled. If you push this switch when the transmitter is in
remote mode, the LED flashes momentarily.
λ Adjust. You control the wavelength of the internal DFB laser with this knob.
The range of the control is ±1 nm. When the transmitter is in remote mode, this
front panel control is disabled.
Use the remote mode controls to activate the rear-panel remote port.
Remote Enable. Use this pushbutton switch to toggle between local mode and
remote mode. The default mode when you power on the instrument is local.
When set to remote mode, the Remote Enable LED illuminates. The remote
mode can be forced from the remote port with the Front Panel Unlock signal.
When the Front Panel Unlock signal is set to a logic low, remote mode is locked
active. The Remote Enable LED will flash momentarily if you push the Remote
Enable switch when attempting to return to local mode.
Operating Basics
13
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