Patent ID: 8137004

Claim:
A plug part for an optical waveguide, comprising: a housing having a longitudinally extending outer side wall and enclosing a length of optical waveguide terminating at an exposed front face within the housing; said housing having cooling medium inlet and outlet openings longitudinally spaced along the housing enabling circulation of a gas cooling medium in the housing between the inlet and outlet openings; a cooling collar comprising a tubular sleeve extending inside and along a portion of the side wall of the housing adjacent to and at least along a length of the optical waveguide including the front face thereof; a protective glass closing and secured to an end of the housing side wall opposite said end, the protective glass having an inner surface facing towards the front face of the optical waveguide and arranged so as to be at least partially exposed to a cooling medium circulating in the housing between said inlet and outlet openings; said front face of the optical waveguide also located and arranged so as to be exposed to a circulating cooling medium in the housing between said inlet and outlet openings, and sleeve outflow openings in the sleeve and arranged so as to provide cooling medium flow communication between outer and inner sides of said sleeve; said sleeve and sleeve outflow openings configured so as to direct cooling medium circulating between said inlet and outlet openings of the housing from the outer side of the sleeve towards a common point on a longitudinal center line of the sleeve.