TIMOTHY LEE GROTZINGER
Engineers in Old Line, PA

5450245, Sep 12, 1995

Oct 26, 1993

8/143179

Timothy L. Grotzinger - Manheim PA
William C. Yager - Blue Bell PA

Laser Communications, Inc. - Lancaster PA

G02B 702

359822

The apparatus is a laser transmitter and receiver unit with independent adjustment of the focus of each and preservation of precise parallel alignment between the two lines of sight. The transmitter laser and the receiver photodetector are each mounted in a precisely machined two part mounting assembly. The first part of both mounting assemblies includes an objective lens and is fitted against the same precise surface of a reference fixture. The second part of each mounting assembly, holding the laser or photodetector, is connected to the first part by means of precisely mated coaxial sliding cylinders, so that the laser or photodetector can be replaced on the fixture with high accuracy. Axial adjustment of the distance of the laser or photodetector from their respective objective lenses is furnished by spacer washers inserted between the two parts of the assemblies. Thus, once a laser or photodetector is initially aligned relative to a common reference surface, each one can be moved closer to or farther from its respective objective lens without affecting the parallelism of the laser and photodetector lines of sight.

4959827, Sep 25, 1990

Mar 30, 1989

7/331253

Timothy L. Grotzinger - Manheim PA
Herbert A. Frederiksen - Mountville PA

Laser Communications, Inc. - Lancaster PA

H04B 900

370 3

A circuit for mixing audio, video and data signals for transmission by laser link. The data signal is first modulated by frequency shift keying and then, after passing through a bandpass filter, is mixed with the audio signal and then frequency modulated at about 12 MHz. The combined signal is then mixed with the 70 MHz frequency modulated video signal, but each signal is isolated from the mixed signal by an appropriate filter so that each signal is not fed to the other source.