Anesthesia system with removable Anästesiemittel metering device

Anesthesia system (1) for providing a enriched with anesthetic respiratory gas, comprising: an anesthesia machine (2) and at least one anesthetic agent dosing device (3) which is detachably coupled to the anesthetic machine, a fluid connection (7, 8, 9) between the anesthesia machine and the at least one metering device, which is designed to direct anesthetic agent from the at least one metering device in the anesthesia machine, at least one optical interface between the anesthesia machine and the at least one metering device, and at least one display device in at least one metering device, wherein the optical interface comprises at least one light source (10) which is provided in the anesthetic machine, and at least one light guide (20) is provided in the anesthetic agent dosing device (3), and wherein by the at least one light source (10) is directed into the at least one optical fiber input light through the at least one light guide (20) to the at least one display device to illuminate this display device directly or indirectly characterized in that the light source (10) is designed as a LED, feeds the light via a light exit surface of the LED by an air gap between anesthesia machine and metering in a light entrance surface of the at least one light guide (20).