Patent ID: 7785528

Claim:
A guide system for optical fibers comprising: a guide tube ( 12 ); an optical fiber guided through the guide tube; a cooling system laterally surrounding the guide tube ( 12 ), the cooling system comprising at least one coolant chamber and a coolant in the coolant chamber, at least one inlet ( 10 ) and at least one outlet ( 11 ) for the coolant to be supplied to and from the coolant chamber, the coolant comprising a mixture of an air stream and water droplets; a further tube ( 14 ), having a plurality of orifices ( 17 ), being arranged around the guide tube ( 12 ) in the coolant chamber; and an apparatus configured to draw the water droplets into the guide system, wherein the coolant chamber is tubular in construction and is hermetically sealed by a seal ( 13 ) at least at one end face of the chamber, wherein the coolant achieves and maintains a temperature of about 130° C. inside the guide tube, wherein the apparatus prevents the water droplets from entering the guide system if supply of the air stream fails, and wherein the plurality of orifices ( 17 ) are distributed in a longitudinal direction of the further tube ( 14 ).