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Table 5: Remote Interface signals
Pin
num-
ber
Signal name
Several
Ground
2
Laser Disable
Several
Not used
6
Laser Power
Unstable
8
Laser Temperature
Unstable
15
Front Panel Unlock Digital
19
Modulator Input
Not Detected
20
Modulator Bias
Unstable
3
ER Adjust Disable
12
ER Adjust
16
Wavelength Adjust
Disable
24
Wavelength Adjust
17
% Crossing Adjust
Disable
10
% Crossing Adjust
21
Laser Enable
Keyswitch On
OI1125 E/O Transmitter Instruction Manual
Signal
type
Description
Analog,
Pin numbers 1, 7, 9, 11, 13, 14, 23, 25
Digital
Digital
The internal laser is disabled when this signal is high. The Remote Safety Interlock, when
input
connected for local operation, shorts this signal to ground.
–––––
Pin numbers 4, 5, 18, 21, 22
Digital
This status signal is driven high when the Internal Laser power control loop is detected to be
output
in an unstable state, or the laser is powered off.
Digital
This status signal is driven high when the Internal Laser temperature control loop is
output
detected to be in an unstable state, such as momentarily when the wavelength is adjusted.
This signal is low when the laser is powered off.
When driven low, this input signal disables the front-panel controls and forces remote mode.
input
Digital
This status signal is driven high when the modulator bias control loop optical signal
output
photodetector detects a valid threshold. This signal is low when the laser is powered off.
Digital
This status signal is driven high when the modulator bias control loop is detected to be in an
output
unstable state, such as momentarily when the modulation signal is connected or removed. It
is low when the modulation bias stabilizes or the laser is powered off.
Digital
When driven low, this signal illuminates the front-panel Extinction Ratio Adjust LED,
input
indicating that the Modulator Driver is not in the calibrated gain state. When this signal is
high, the Modulator Driver is in the calibrated state and the ER Adjust Control signal is
disabled. This signal is active in Remote mode only.
Analog
This control signal can be used to control the extinction ratio by varying the Modulator Driver
input
gain. In Remote mode, the front panel ER Adjust control is inactive, and the ER is controlled
by the analog signal. The input range is ±2.5 V, which adjusts the extinction ratio from
<5 dB to >12dB. Due to component variation, the maximum extinction ratio may not be at
+2.5 V. This signal is active in remote mode only.
Digital
When driven low, this signal illuminates the front-panel Wavelength Adjust Enable LED,
input
indicating that the wavelength is not in its calibrated state. When this signal is high, the
wavelength is in its calibrated state, and the Wavelength Adjust signal is disabled. This
signal is active in Remote mode only.
Analog
This signal can be used to control the internal laser wavelength. In Remote mode, the
input
front-panel Wavelength Adjust control is inactive, and the wavelength is controlled by the
analog signal. The input range is ±2.5 V, which adjusts the wavelength at least ±1 nm. This
signal is active in Remote mode only.
Digital
When driven low, this input signal allows the % crossing adjustment to be controlled
remotely through a ±2.5 V signal on pin #10. This signal is active in Remote mode only.
input
The input range is ±2.5 V, which adjusts the % crossing at least 45% to 55%. This signal is
Analog
input
active in Remote mode only.
Digital
This signal is high when the front-panel Laser Enable keyswitch is rotated clockwise to the
output
On position, and low when the keyswitch is rotated counterclockwise to the Off position.
Operating Basics
17
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