Richard J Roth

US Patent:

6501877, Dec 31, 2002

Filed:

Nov 16, 1999

Appl. No.:

09/442061

Inventors:

Robert T. Weverka - San Mateo CA
Steven P. Georgis - Boulder CO
Richard S. Roth - Boulder CO

Assignee:

Network Photonics, Inc. - Boulder CO

International Classification:

G02B 626

US Classification:

385 31, 385 33, 385 39, 385 37

Abstract:

A wavelength router that selectively directs spectral bands between an input port and a set of output ports. The router includes a free-space optical train disposed between the input ports and said output ports, and a routing mechanism. The free-space optical train can include air-spaced elements or can be of generally monolithic construction. The optical train includes a dispersive element such as a diffraction grating, and is configured so that the light from the input port encounters the dispersive element twice before reaching any of the output ports. The routing mechanism includes one or more routing elements and cooperates with the other elements in the optical train to provide optical paths that couple desired subsets of the spectral bands to desired output ports. The routing elements are disposed to intercept the different spectral bands after they have been spatially separated by their first encounter with the dispersive element.

US Patent:

56665245, Sep 9, 1997

Filed:

Aug 31, 1994

Appl. No.:

8/299225

Inventors:

Douglas F. Kunkel - Piedmont CA
Richard K. Roth - Santa Fe NM
Jay Robert Poulos - Salem OR

Assignee:

Price Waterhouse LLP - Sacramento CA

International Classification:

G06F 1730
G06F 1516

US Classification:

395603

Abstract:

A parallel processing system is provided which traverses logical records of an events or transactional database contained in two or more physical files in accordance with one or more view definitions specified by the user. Each view definition includes a set of processing parameters and may reference one or more of the physical files. The one or more view definitions are transformed into entries of a logic table, the logic table including a plurality of sets, each set corresponding to a respective physical file and containing entries corresponding to the view definitions which reference its respective physical file. Each set of the logic table is transformed into machine code instructions for a separate thread of the parallel processing system. Each thread operates on its respective physical file in parallel with one or more of the other threads to traverse the physical file, to retrieve information based upon the view definitions corresponding to the thread, and to store the retrieved information in extract files designated by the view definitions in formats designated by the view definitions.