Patent ID: 7198415

Claim:
An optical receptacle to be optically coupled with a connector plug that secures an external fiber with a core to transmit light and a cladding surrounding said core, said optical receptacle comprising: a sleeve assembly for receiving said connector plug, said sleeve assembly having a cylindrical shape; and a stub secured within said sleeve assembly and having a front end and a rear end opposite to said front end, said stub having a bore filled with a filler and an opening with a diameter substantially equal to a diameter of said cladding of said external fiber to expose said filler at said front end, said bore having a constant diameter greater than a diameter of said cladding of said external fiber at a side of said rear end, said stub together with said filler forming a convex shape at said front end to have said filler in physical contact to said core of said external fiber, wherein said filler is made of silica glass.