Operating Basics
OI1125 E/O Transmitter Instruction Manual
17
Table 5: Remote Interface signals
Pin
num-
ber
Signal name
Signal
type
Description
Several
Ground
Analog,
Digital
Pin numbers 1, 7, 9, 11, 13, 14, 23, 25
2
Laser Disable
Digital
input
The internal laser is disabled when this signal is high. The Remote Safety Interlock, when
connected for local operation, shorts this signal to ground.
Several
Not used
–––––
Pin numbers 4, 5, 18, 21, 22
6
Laser Power
Unstable
Digital
output
This status signal is driven high when the Internal Laser power control loop is detected to be
in an unstable state, or the laser is powered off.
8
Laser Temperature
Unstable
Digital
output
This status signal is driven high when the Internal Laser temperature control loop is
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.
15
Front Panel Unlock
Digital
input
When driven low, this input signal disables the front-panel controls and forces remote mode.
19
Modulator Input
Not Detected
Digital
output
This status signal is driven high when the modulator bias control loop optical signal
photodetector detects a valid threshold. This signal is low when the laser is powered off.
20
Modulator Bias
Unstable
Digital
output
This status signal is driven high when the modulator bias control loop is detected to be in an
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.
3
ER Adjust Disable
Digital
input
When driven low, this signal illuminates the front-panel Extinction Ratio Adjust LED,
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.
12
ER Adjust
Analog
input
This control signal can be used to control the extinction ratio by varying the Modulator Driver
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.
16
Wavelength Adjust
Disable
Digital
input
When driven low, this signal illuminates the front-panel Wavelength Adjust Enable LED,
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.
24
Wavelength Adjust
Analog
input
This signal can be used to control the internal laser wavelength. In Remote mode, the
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.
17
% Crossing Adjust
Disable
Digital
input
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.
10
% Crossing Adjust
Analog
input
The input range is
±
2.5 V, which adjusts the % crossing at least 45% to 55%. This signal is
active in Remote mode only.
21
Laser Enable
Keyswitch On
Digital
output
This signal is high when the front-panel Laser Enable keyswitch is rotated clockwise to the
On position, and low when the keyswitch is rotated counterclockwise to the Off position.
Summary of Contents for OI1125
Page 4: ......
Page 8: ...Table of Contents iv OI1125 E O Transmitter Instruction Manual...
Page 20: ...Getting Started 8 OI1125 E O Transmitter Instruction Manual...
Page 30: ...Operating Basics 18 OI1125 E O Transmitter Instruction Manual...
Page 36: ...Specifications 24 OI1125 E O Transmitter Instruction Manual...
Page 38: ......
Page 42: ...Theory of Operation 30 OI1125 E O Transmitter Instruction Manual...
Page 72: ...Performance Verification 60 OI1125 E O Transmitter Instruction Manual...