David P Rowe

US Patent:

6288817, Sep 11, 2001

Filed:

Jan 21, 1998

Appl. No.:

9/010785

Inventors:

David M. Rowe - Medway MA

Assignee:

Avanex Corporation - Fremont CA

International Classification:

G02B 2608

US Classification:

359204

Abstract:

A scanner includes a single scanning element such as a holographic disc or a polygon mirror and an illumination system that provides a plurality of input beams that are directed to different areas on the scanning element. In one embodiment, a light source provides a single beam that is alternately directed to a first area and a second area. While an input beam is incident on the first area, a first scan line forms. While an input beam is incident on the second area, a second scan line forms. Duty-cycle and energy efficiency of this embodiment are high because the beam from the source is switched from one area to the other during dead time when a scan beam would not otherwise have been directed to the desired scan aperture. Separate scan lines are automatically synchronized since they originate from the same source. Thus, alignment of multiple scan lines to form an extended scan line is simplified.

US Patent:

52708420, Dec 14, 1993

Filed:

Nov 23, 1992

Appl. No.:

7/980010

Inventors:

Burton R. Clay - Wayland MA
David M. Rowe - Bellingham MA

Assignee:

Holographix, Inc. - Hudson MA

International Classification:

G03H 104
B29D 1100

US Classification:

359 12

Abstract:

A system that provides a structure which makes use of a recording geometry in which no significant Seidel induced aberrations arise. The recording geometry results in a pattern recorded on a photosensitive surface, thereby creating the hologram on the scanning disc. Reconstruction of the recorded object may be made by exposing the scanning disc to substantially monochromatic light. The hologram on the scanning disc not only directs the reconstruction beam, but also focuses it. An optical element may be used during reconstruction to correct for bow and linearity, and also optimize flatness of the focal plane. Reconstruction also involves achromatization, or correction of beam placement because of mode hops or drift in laser frequency. The reconstruction comprises both pre-scan holograms and post-scan holograms. Recording of the post-scan hologram is achieved with a plurality of lenses which possess different collimating properties in the vertical and horizontal planes.

US Patent:

51826593, Jan 26, 1993

Filed:

Feb 20, 1991

Appl. No.:

7/657915

Inventors:

Burton R. Clay - Wayland MA
David M. Rowe - Bellingham MA

Assignee:

Holographix, Inc. - Weltham MA

International Classification:

G02B 532
G02B 2610

US Classification:

359 17

Abstract:

A system that provides a structure which makes use of a recording geometry in which no significant Seidel induced aberrations arise. The recording geometry results in a pattern recorded on a photosensitive surface, thereby creating the hologram on the scanning disc. Reconstruction of the recorded object may be made by exposing the scanning disc to substantially monochromatic light. The hologram on the scanning disc not only directs the reconstruction beam, but also focuses it. An optical element may be used during reconstruction to correct for bow and linearity, and also optimize flatness of the focal plane. Reconstruction also involves achromatization, or correction of beam placement because of mode hops or drift in laser frequency. The reconstruction comprises both pre-scan holograms and post-scan holograms. Recording of the post-scan hologram is achieved with a plurality of lenses which possess different collimating properties in the vertical and horizontal planes.

US Patent:

20180338063, Nov 22, 2018

Filed:

Aug 24, 2017

Appl. No.:

15/685379

Inventors:

- Hamilton, BM
Amogh D. Thaly - Caranzalem, IN
David Rowe - Littleton MA, US
Niall D. O'Connell - Clarina, IE
Lucas Valentin Garcia - Valencia, ES

International Classification:

H04N 1/333
H04N 1/327

Abstract:

This disclosure relates generally to communicating video content and other data over networks. An example apparatus includes a transmitter for communicating data via a serial link with a receiver. The transmitter includes an input, an output interface to the serial link, and translation circuitry. The input includes multiple input data lanes and a clock lane, and the input is configured to concurrently receive data on the multiple input data lanes aligned with a clock signal received on the clock lane according to a multi-lane communication protocol. The output interface is a clock-less interface and includes a number of output data lanes less than a number of the multiple input data lanes. The translation circuitry translates the data received according to the multi-lane communication protocol to a serial link communication protocol for transmission on the serial link.