an anesthesia system for providing a breathing gas enriched with anesthetic has an anesthesia apparatus and at least one anesthetic dispensing device , which is detachably coupled with the anesthesia apparatus . a fluid connection is provided between the anesthesia apparatus and the dispensing device , which is designed to send anesthetic from the dispensing device into the anesthesia apparatus . at least one optical interface is provided between the anesthesia apparatus and the dispensing device . at least one display device is provided in the dispensing device . the optical interface has at least one light source , which is provided in the anesthesia apparatus , and at least one fiber optic light guide , which is provided in the anesthetic dispensing device . the light fed by the light source into the fiber optic light guide is sent to the display device to directly or indirectly light the display device .