Erbium-Doped Fiber Amplifiers
Chapter 7: Making Safety Interlock Connections
Page 10
TTN256521-D02
Making Safety Interlock Connections
The EDFA300S and EDFA300P instruments are equipped with a remote interlock connector located on the rear
panel. 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.
All units shipped from Thorlabs are configured with a shorting BNC 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 (BNC male) and wire it to your remote interlock switch.
