INTUN Tunable Laser
12372-D02, 12/15/2007
Page 22
www.thorlabs.com
The _OPTICAL_POWER_ENABLE signal is well suited to the implementation of a safety circuit that
switches off the laser in critical situations.
Important!
The _OPTICAL_POWER_ENABLE signal should NEVER be used for modulation of the
optical power!
Digital Control: _CONSTANT_CURRENT_ENABLE
The digital control signal _CONSTANT_CURRENT_ENABLE is used to enable current tuning. Read
the appropriate section starting on page 23 carefully prior to using this feature.
Digital Control: _FINE_TUNING_ENABLE
This digital control signal is used to fine tune the wavelength by adjusting the cavity temperature.
Digital Status Signals
The digital status signals are defined with 0 V (LOW) as ON/TRUE/ERROR and 5 V (HIGH) as
OFF/FALSE/Safe. The digital status signals can be read form the interface. Carefully read the Definition
of the Logical States at the top of page 20 before connecting the INTUN TL-T. The digital output
circuitry is shown in Figure 11.
Digital Status Signals
Name
Short Description
_SYSTEM_ERROR
This status signal indicates a major fault such as overheating of the turning
motor or overloading of a control loop
_WAVELENGTH_ERROR
This status signal indicates that the INTUN TL-T does not follow the
applied wavelength sweep voltage.
_OPTICAL_POWER_ERROR
This status signal indicates that the laser current has exceeded 100 mA.
_TEMPERATURE_ERROR
This status signal indicates that the laser cavity is not operating at the
correct temperature
Figure 15: Digital output circuitry
