(EN) The invention relates to an optical plug-in connection which comprises an optical plug-in connector (10) and a coupler (24) into which the plug-in connector (10) can be inserted, and unlockable locking elements (14, 17) which effect that the plug-in connector (10) locks in the coupler (24) when the plug-in connector (10) is inserted into the coupler (24). In order to ensure with simple means that the plug-in connection is reliably locked, the locking elements (14, 17) are configured in such a manner that they cannot be unintentionally unlocked when in the locked state.