Paul F Matthews

US Patent:

6362759, Mar 26, 2002

Filed:

Jun 26, 2000

Appl. No.:

09/606098

Inventors:

Paul D. Biernacki - Alexandria VA
Paul J. Matthews - Springfield VA
Michael E. Gingerich - Dumfries VA
Michael L. Frankel - Baltimore MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H03M 112

US Classification:

341137, 341155

Abstract:

A circuit for selectably generating a plurality of preselected digital output signals which are precise and accurate, and among which the circuit can switch rapidly. In one embodiment, the outputs are connected to analog circuit signals, and drive a optical laser such that choice of the particular outputs of the circuit permits controllable switching of the laser output wavelength.

US Patent:

6404366, Jun 11, 2002

Filed:

Dec 1, 2000

Appl. No.:

09/726616

Inventors:

Thomas Clark - Columbia MD
Paul Matthews - Springfield VA

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

H03M 100

US Classification:

341137, 359122

Abstract:

A new pipeline method and apparatus for photonic analog-to-digital converters (ADCs) utilizing wavelength division multiplexing (WDM) and distributed phase modulation is disclosed. The analog-to-digital conversion is performed within the optical system of the ADC, and thus the optical output is a digital bit pattern. The optical output of this system thus facilitates ADC conversion at much higher speeds than available with conventional electronic ADCs. Phase modulators and polarization-based optics are used to map an input analog waveform into a binary output.

US Patent:

6738536, May 18, 2004

Filed:

Dec 20, 2001

Appl. No.:

10/022360

Inventors:

Evelyn Boettcher - Greenbelt MD
Sandeep T. Vohra - Ellicott City MD
Paul J. Matthews - Ellicott City MD
Paul D. Biernacki - Fairfax VA

Assignee:

Optinel Systems, Inc. - Elkridge MD

International Classification:

G02F 1295

US Classification:

385 10, 385 37, 398 84, 398 87

Abstract:

A wavelength tunable filter for optical communication systems has an optical fiber containing a Bragg grating disposed within a compliant support block. A length of the fiber is wrapped in a spiral of fixed pitch around the longitudinal axis of a cylindrical polymer support block. The support block is placed within a support frame to which a micrometer screw assembly is attached and oriented to apply a variable mechanical load substantially parallel to the longitudinal axis of the cylindrical support block. Application of the load introduces a strain on the support block, changing the period of the refractive index in the fiber Bragg grating with a resulting shift in the Bragg reflection peak.

US Patent:

6807343, Oct 19, 2004

Filed:

May 29, 2002

Appl. No.:

10/156197

Inventors:

David A. Tulchinsky - Arlington VA
Paul J. Matthews - Ellicott City MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G02B 626

US Classification:

385 39, 385 15, 385140, 385 24

Abstract:

An array antenna apparatus for producing a time-delay beamformed RF signal includes a laser, a modulator for RF modulating the laser optical signal, a first plurality of optical paths coupling the modulator output to a dispersive prism, another plurality of optical paths coupling the dispersive prism outputs to a corresponding plurality of time delay trimmers, an attenuator coupled to each time delay trimmer, and an optical switching matrix to which the time delay trimmers outputs are input. The inputs to the optical switching matrix accordingly are time and amplitude adjusted to remove front end errors prior to rerouting. This is repeated in the back end of the apparatus, in which the switching matrix outputs are each applied to a corresponding attenuator, the outputs of which are then each applied to a photodetector to generate a plurality of replica RF signals that are each applied to a time shifter, thereby producing an error-corrected output that is then applied to an antenna array. The output of the antenna array is a time-delay beamformed RF signal having a 2-D beamsteering capability.

US Patent:

6907158, Jun 14, 2005

Filed:

Nov 4, 2002

Appl. No.:

10/286975

Inventors:

Sandeep J. Vohra - Ellicott City MD, US
Paul J. Matthews - Ellicott City MD, US

Assignee:

Broadband Royalty Corporation - Wilmington DE

International Classification:

G02B006/28

US Classification:

385 24, 385 16

Abstract:

An arrangement is provided for a configurable optical add/drop multiplexer (OADM) mechanism. The configurable OADM mechanism comprises at least one configurable optical add/drop multiplexer (C-OADM) module and at least one switch associated with the C-OADM modules (the minimum configuration is only one C-OADM with bypass (expansion) switches). The switches can be configured so that some of the C-OADM modules can be selected to form a processing pipeline. Each of the selected C-OADM moduels may be further configured to perform wavelength manipulations such as adding a wavelength, dropping a wavelength, tapping an input optical signal, and a combination thereof.

US Patent:

7127182, Oct 24, 2006

Filed:

Oct 16, 2002

Appl. No.:

10/270726

Inventors:

Paul J. Matthews - Ellicott City MD, US
Paul D. Biernacki - Fairfax VA, US
Sandeep T. Vohra - Ellicott City MD, US

Assignee:

Broadband Royalty Corp. - Wilmington DE

International Classification:

H04B 10/04

US Classification:

398183, 398182, 398185, 398186, 398187, 398188, 398189, 398190, 398191, 398192, 398193, 398194, 398200, 398140, 398141, 398147, 398158, 398159, 398202, 398 25, 398 30, 398 31, 398 32, 370204, 385 2, 342367

Abstract:

A transmitter for optical communication systems includes a source of optical radiation, a source of complex non-information signals, and a modulator unit in communication with the source of optical radiation. The modulator unit is also in communication with the source of complex non-information signals. The modulator has an input adapted to receive information-bearing signals.

US Patent:

20030079233, Apr 24, 2003

Filed:

Oct 9, 2002

Appl. No.:

10/266930

Inventors:

Paul Matthews - Ellicott City MD, US
Paul Biernacki - Fairfax VA, US
Irl Duling - Lancaster PA, US

International Classification:

H04N007/173
H04N007/16

US Classification:

725/129000, 725/117000, 725/147000, 725/118000

Abstract:

An arrangement is provided for consolidating equipment, services, and information and for distributing information from a consolidated information distribution center (CIDC) to a plurality of head ends using spectrally efficient transport. The CIDC generates an optical signal encoded with information of multiple channels aggregated through a multi-level encoding scheme and sends the optical signal to a plurality of head ends via an optical fiber. When a head end receives the optical signal, it decodes the optical signal in multiple stages to produce information of multiple data streams, from which desired data streams are selected.

US Patent:

20030128718, Jul 10, 2003

Filed:

Dec 20, 2002

Appl. No.:

10/267045

Inventors:

Paul Matthews - Ellicott City MD, US
Paul Biernacki - Fairfax VA, US
Irl Duling - Lancaster PA, US

International Classification:

H04J001/00
H04J003/04

US Classification:

370/480000

Abstract:

An arrangement is provided for switching and routing large bandwidth continuous information from a consolidated information distribution center (CIDC). The CIDC generates an optical signal encoded with information of multiple channels carried by one or more dedicated optical carriers and sends the optical signal to a plurality of head ends via an optical fiber. When a head end receives the optical signal, it decodes the optical signal to obtain information intended for the head end from at least one optical carrier that is dedicated to carry the information desired by the head end.