Ronald C Schmidt, 691203 Embassy Ct, Powder Springs, GA 30127

4012113, Mar 15, 1977

Dec 17, 1975

5/641649

Herwig Werner Kogelnik - Fair Haven NJ
Ronald Vernon Schmidt - Matawan NJ

G02B 516

350 96C

An optical switch of the switched directional coupler type is provided with an adjustable cross-over state as well as an adjustable straight-through state, in order to provide reduced crosstalk in the cross-over state, for example, when the switches are used in an optical switching system. The improved switch is based on asynchronous or phase-mismatched coupling between two parallel optical strip guides driven by electrodes to which the voltage is applied. In order to use phase-mismatched coupling instead of phase-matched coupling for the cross-over state, in order thereby to obtain electrical adjustability of that state, the driving electrodes are split into two or more sequential sections, thereby defining two sequential coupling sections of the parallel optical strip guides. The cross-over coupling is then achieved by switching the mismatch conditions so that at the point of partial coupling the "nonoriginating" guide appears to the coupled optical waves to be the "originating" guide.

4211467, Jul 8, 1980

Jan 13, 1978

5/869364

Peter S. Cross - Middletown NJ
Ronald V. Schmidt - Matawan NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

G02B 514

350 9614

An integrated optically-controlled 4-port bistable switch having a waveguide directional coupler as one of its elements is disclosed. A photodetector is positioned so as to be sensitive to the optical energy at one output port of the directional coupler and the voltage developed by this photodetector is coupled to electrode elements of the directional coupler. The resulting bistable device permits such functions as remote optical switching to be performed.

5606664, Feb 25, 1997

Apr 12, 1993

8/046405

Brian Brown - San Jose CA
Shabbir A. Chowdhury - San Jose CA
Jean-Luc Fontaine - Maisons Laffitte, FR
Chao-Yu Liang - San Jose CA
Ronald V. Schmidt - Portola Valley CA
Chang-Jung Wang - Cupertino CA

Bay Networks, Inc. - Santa Clara CA

G06F 1516
G06F 15177
H04L 1228

3952001

Apparatus for monitoring and displaying the status of a local area network. The network includes a hub with ports for connection to various data terminal equipment in a star configuration and for connection to other hubs of the network. The hubs each have different types of plug-in modules which have ports for connecting the hub to different types of network cable such as fiber optic cable, unshielded twisted pair cable and shielded twisted pair cable. Information is automatically provided to a control console identifying the types of modules and the location of the modules in the hub so that an image of the actual hub can be displayed on the screen of the control console. The actual hub image shows the location and types of modules installed in the hub. In addition, information regarding the connection of each of the hubs to other hubs of the network is obtained and provided to the control console. The information is processed so as to automatically produce a topology map on the control console display showing the overall topology of the network.

4155056, May 15, 1979

Aug 25, 1977

5/827576

Peter S. Cross - Middletown NJ
Ronald V. Schmidt - Matawan NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H03H 926
H03H 932
G02B 5124
G02B 526

333195

Acoustical and optical surface wave filters are described wherein the filter characteristic near resonance is provided by cascaded grating resonators. The out-of-band suppression for these resonators is provided by a track changing element that includes a four-port directional coupler having one port connected to receive input energy and a fourth port connected to couple energy into the cascaded grating resonators. Tapered and chirped reflection gratings are positioned so as to selectively reflect energy present at the second and third ports of the directional coupler. In a surface acoustic wave embodiment of the invention, the directional coupler is provided by a multistrip coupler. In an optical embodiment, the directional coupler function is provided by waveguiding structures that are brought sufficiently close to induce 3 dB coupling.

3946338, Mar 23, 1976

Jun 9, 1975

5/584765

Ronald Vernon Schmidt - Matawan NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

H03H 926
H03H 930
H03H 932
H01L 4118

333 30R

Acoustic waveguides, acoustic filters and acoustic reflectors are based upon the discovery of increased acoustic wave velocity in materials such as lithium niobate and lithium tantalate into which a metal such as titanium, nickel or chromium has been diffused. Velocity increases larger than 1 percent have been obtained; and negligible effect on acoustic loss is incurred thereby. The technique and the resulting devices result in a simpler structure than provided by the metallic strips or the ion beam etched surface regions of prior acoustic devices in which velocity perturbations of comparable magnitude have been desired.

4146297, Mar 27, 1979

Jan 16, 1978

5/869515

Rodney C. Alferness - Matawan NJ
Ronald V. Schmidt - Matawan NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

G02B 514

350 9614

An integrated optical filter composed of coupled nonidentical strip waveguides in LiNbO. sub. 3 is disclosed. The device has a broad bandwidth, is tunable over several hundred angstroms, and offers electrical control of the crossover efficiency. Several devices are combined on a single substrate to provide an electrically tunable multiplexer or demultiplexer.

4284663, Aug 18, 1981

Dec 17, 1979

6/104676

John R. Carruthers - Murray Hill NJ
Ivan P. Kaminow - New Shrewsbury NJ
Ronald V. Schmidt - Matawan NJ

Bell Telephone Laboratories, Incorporated - Murray Hill NJ

B05D 506

427164

There is disclosed a method of fabricating an optical waveguiding surface layer in an optically transparent crystalline substrate, such as lithium niobate, by selectively indiffusing metal ions, such as titanium, into the crystal to effect an increase in the index of refraction of a surface portion thereof. The indiffused metal ions serve to raise both the ordinary and extraordinary refractive indices of the substrate by amounts which are of the order of one percent at the diffusion surface and which gradually decrease by one-half at depths of the order of one micrometer below the surface. By properly adjusting the relevant diffusion parameters in the method, the important surface waveguide characteristics can be independently controlled.

4531238, Jul 23, 1985

Dec 3, 1981

6/326869

Eric G. Rawson - Saratoga CA
Hallam G. Murray - Menlo Park CA
Ronald V. Schmidt - Portola Valley CA
Lawrence C. Stewart - Palo Alto CA

Xerox Corporation - Stamford CT

H04B 900

455601

An active repeater for a star configured communications network includes a threshold detector for collision detection. Whenever two or more terminals simultaneously feed data into the repeater, a threshold sensitive collision detector is triggered to logically isolate the data from the output of the repeater and to logically substitute a predetermined collision signal therefor, thereby causing the competing terminals to reset to retry the transmissions at randomly selected later times.