Fiber Amplifier
Chapter 6: Making Safety Interlock Connections
TTN118382-D02, Rev A, November 18, 2016
Page 10
Making Safety Interlock Connections
The EDFA100S and EDFA100P are equipped with a remote interlock connector located on the rear panel, as shown
in Figure 1 on page 7. In order to enable the fiber amplifier, a short circuit must be applied across the terminals of
the Remote Interlock connector. This connection is made available to allow the user to connect a remotely actuated
switch to the connector (i.e. an open door indicator).
The switch that is connected to this interlock must be normally open (N.O.), meaning that it has to be closed in
order for the unit to be enabled. If the switch is changed to an open state, the amplifier will automatically shut down.
If the switch returns to a closed condition, the amplifier will not re-enable until the ENABLE switch is pressed or until
the Set Enable command is entered in the command-line interface (see Section 7.3).
All units shipped from Thorlabs are configured with a shorting device installed in the interlock connector. If you are
not going to use this feature then you can leave the shorting device installed and the unit will operate normally, as
described throughout this manual. If you wish to make use of the interlock feature you will need to acquire the
appropriate mating connector (e.g., a 2.5 mm mono jack, available at most electronics stores) and wire it your
remote interlock switch.
The electrical specifications for the interlock input are shown in the following table.
Specification
Value
Mating Connector
2.5 mm Mono Phono Jack
Open Circuit Voltage
Internal Pull Up to 5 VDC
Short Circuit Requirements
1.0 mA DC
Interlock Switch Requirements
Must be N.O. Dry Contacts
Under No Circumstances Should Any External
Voltages be Applied to the Interlock Input
Ground
Interlock Circuitry
