Abstract: A ball lens connector part having low total reflections as well as a method of manufacturing such a ball lens connector part are described. The total reflections can be limited to less than -60 dB by means of the present ball lens connector part. The ball lens connector part comprises a fiber with an inclined fiber end in a tubular housing which housing further comprises a ball lens. If the ball lens comprises a flat surface, the total reflections can be lower than -80 dB. By subjecting the end of the housing to a machining treatment, the center line of the said end is moved in such a manner that it coincides with the optical axis of the emanating light beam.

Abstract: Grooves are etched in a glass substrate, using a metallic mask, after which the substrate is coated with a layer of glass having a refractive index which is higher than that of the substrate, the groove being filled completely. Excess glass is removed, the metallic mask being used as a stop layer and a protective layer being provided at the location of the filled grooves. Excess glass is removed at the location of the grooves by means of polishing so that a high accuracy as regards depth can be obtained.

Abstract: A method of manufacturing lens elements, in which a glass preform heated to the softening temperature and an annular metal holder (3) enclosing the glass preform are arranged between the heated moulding dies (7,9) of a mould and are moulded in a pressing step into a lens element comprising a glass lens (21) and a ring (3) enclosing the glass lens and acting as a fitting. During moulding, the ring 3 forms together with the two dies (7,9) a quasi closed moulding cavity having an annular gap (15). During moulding, the ring (3) is expanded radially and a quantity of glass is pressed.