US Patent 7722261 Expanded beam connector

An optical connector comprising: (a) a lens; (b) a ferrule assembly comprising a ferrule with an endface and at least one fiber in the ferrule having a fiber end presented at the endface; (c) a housing for holding the ferrule assembly and the lens in a certain axial and radial relationship; and (d) a glass element having a first and second surface, the first surface affixed to the endface such that it is in physical contact with the fiber end, the second surface having an AR coating and defining a space between it and the lens.