Patents by Inventor Lawrence Edwin Foltzer

Lawrence Edwin Foltzer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5969836
    Abstract: Downstream digital telephony signals are transmitted over the 1310 nm transmission band of a silica optic fiber. Upstream digital telephony signals are transmitted over a "short wavelength" portion of the 1550 nm transmission band of the optic fiber, i.e. within a portion of the 1550 nm transmission band having wavelengths less than a predetermined threshold wavelength of 1550 nm. Simultaneously, downstream analog video signals are transmitted over a "long wavelength" portion of the 1550 nm transmission band of the optic fiber, i.e. within a portion of the 1550 nm transmission band having wavelengths exceeding the predetermined threshold wavelength of 1550 nm but still within an erbium-doped fiber amplifier gain profile. Thus, the upstream digital telephony signals are always transmitted at wavelengths shorter than the threshold wavelength and the downstream analog video signals are always transmitted at wavelengths longer than the threshold wavelength.
    Type: Grant
    Filed: December 12, 1997
    Date of Patent: October 19, 1999
    Assignee: Alcatel USA Sourcing, L.P.
    Inventor: Lawrence Edwin Foltzer