Andrew K Robinson

Address:

905 Hillside Ln, Flower Mound, TX 75028

VIN:

1G6DM57T570144109

Make:

CADILLAC

Model:

CTS

Year:

2007

US Patent:

6377374, Apr 23, 2002

Filed:

Nov 16, 1999

Appl. No.:

09/441527

Inventors:

Gary B. Davis - Rowlett TX
Reddy Urimindi - Plano TX
Andrew N. Robinson - Plano TX
Rainer Iraschko - Sunnyville CA
George Georgiou - Garland TX

Assignee:

MCI Communications Corporation - Washington DC

International Classification:

H04J 1402

US Classification:

359128, 359110, 359161

Abstract:

An method, apparatus, and computer program product for restoring a failed system in an optical mesh network. A system includes a first light termination element (LTE) and a second LTE. A first node in the network includes an optical switching unit (OSU) coupled to the first (LTE) of the system. A second node in the network includes a second OSU coupled to the second (LTE) of the system. The first node is coupled to the second node by a path. Optical data traffic can be transmitted between the first node and the second node via the path. Upon detection of a failure of the system, the first OSU and second OSU are notified of the failure. A primary role is assigned to one of the first and second OSUs, and a secondary role is assigned to the other one of the first and second OSUs. A primary restoration plan is determined by the primary OSU. Information identifying the primary restoration plan is sent from the primary OSU for effecting the restoration path to restore the system.

US Patent:

6493116, Dec 10, 2002

Filed:

Feb 9, 1999

Appl. No.:

09/248521

Inventors:

Andrew Niall Robinson - McKinney TX
Xiaoping Charles Mao - Plano TX

Assignee:

MCI WorldCom, Inc. - Jackson MS

International Classification:

H04B 1008

US Classification:

359110, 359156, 359161

Abstract:

A fiber optic communications link having PMD characterization across multiple optical channels to identify PMD problems. The communications link has adaptive PMD controls employed along the optical link, whereby PMD phenomena detected by instruments, such as PMD compensators, are interpreted as being either attributable to perturbation of fiber characteristics at large, or by failure of PMD equipment along the link. The present invention avoids taking unnecessary control or maintenance actions upon PMD related controllers and compensators. PMD notifications from various PMD compensators are correlated to identify which portion of the link has undergone a change in polarization characteristics to further identify PMD related errors and problems.

US Patent:

6704510, Mar 9, 2004

Filed:

Nov 27, 2001

Appl. No.:

09/993644

Inventors:

Andrew Niall Robinson - McKinney TX
Xiaoping Charles Mao - Plano TX

Assignee:

WorldCom, Inc. - Clinton MS

International Classification:

H04J 1402

US Classification:

398 81, 398 17, 398 65, 398152, 398147

Abstract:

A fiber optic communications link having PMD characterization across multiple optical channels to identify PMD problems. The communications link has adaptive PMD controls employed along the optical link, whereby PMD phenomena detected by instruments, such as PMD compensators, are interpreted as being either attributable to perturbation of fiber characteristics at large, or by failure of PMD equipment along the link. The present invention avoids taking unnecessary control or maintenance actions upon PMD related controllers and compensators. PMD notifications from various PMD compensators are correlated to identify which portion of the link has undergone a change in polarization characteristics to further identify PMD related errors and problems.

US Patent:

61574775, Dec 5, 2000

Filed:

May 27, 1998

Appl. No.:

9/085368

Inventors:

Andrew Niall Robinson - McKinney TX

Assignee:

MCI Communications Corporations - Washington DC

International Classification:

H04B 1018

US Classification:

359161

Abstract:

A bidirectional chromatic dispersion system includes an optical circulator that includes four ports. A first port is coupled to a first optical transmission medium and a third port is coupled to the second optical transmission medium. A first dispersion compensating grating is coupled to a second port, and a second dispersion compensating grating is coupled to a fourth port. The first dispersion compensating grating is operative to reflect wavelengths in a first optical band, and the second dispersion compensating grating is operative to reflect wavelengths in a second optical band. The first dispersion compensating grating is substantially transparent to wavelengths in the second optical band, and the second dispersion compensating grating is substantially transparent to wavelengths in the first optical band. The first dispersion compensating grating is coupled to the second port of the optical circulator through the second dispersion compensating grating and a dispersion compensating fiber. Similarly, the second dispersion compensating grating is coupled to the fourth port through the first dispersion compensating grating and the dispersion compensating grating.

US Patent:

57267880, Mar 10, 1998

Filed:

Sep 30, 1996

Appl. No.:

8/720477

Inventors:

John A. Fee - Plano TX
Shoa-Kai Liu - Richardson TX
Andrew Niall Robinson - Plano TX
Reddy Urimindi - Plano TX

Assignee:

MCI Corporation - Washington DC

International Classification:

H04B 1000
H04J 1408

US Classification:

359163

Abstract:

An optical interface device dynamically reconfigures a telecommunications network. The device includes an optically switched backplane connected between two stages of an optical tapped amplifier. Various modules may be plugged into the backplane for performing selective processing of the optical signal without any signal conversion to electrical domain. The modules are electrically controlled by a controller, which is also a module, overseeing the operations upon the optical signal by other modules.

US Patent:

60059974, Dec 21, 1999

Filed:

Dec 31, 1997

Appl. No.:

9/001829

Inventors:

Andrew N. Robinson - Plano TX
Scott A. Welch - Allen TX

Assignee:

MCI Communications Corporation - Washington DC

International Classification:

G02B 602
H04B 1000

US Classification:

385 24

Abstract:

The present invention provides an improved terrestrial optical fiber communications network link including an increased number of amplification sites spaced at intervals along the link in series with shorter optical fiber spans. One embodiment of the invention includes an improved long-haul terrestrial optical fiber link having low-power line optical amplifiers (LPLAs) at the amplification sites connected together by optical fiber spans. In other embodiments of the present invention, some or all of the LPLAs have integrated dispersion compensation modules (DCMs). Another embodiment of the improved optical fiber link system uses proper adjustment and spacing of LPLA amplifiers (e. g. , spaced between 30-60 km long fiber spans) to eliminate the need for lightwave regenerators (LREs) even along very long (e. g. , 300-2500 km long or even longer) links.

US Patent:

63172321, Nov 13, 2001

Filed:

Mar 25, 1998

Appl. No.:

9/047637

Inventors:

John A. Fee - Plano TX
Andrew Niall Robinson - Plano TX

Assignee:

MCI Communications Corporation - Washington DC

International Classification:

H04J 1402

US Classification:

359124

Abstract:

An all-optical system for regenerating a first optical signal carried in a first direction on an optical transmission medium and a second optical signal carried in a second direction on the optical transmission medium includes a bi-directional clock recovery loop and a bi-directional optical gate. The bi-directional clock recovery loop includes a first optical clock recovery circuit for recovering a first clock signal from the first optical signal and a second optical circuit for recovering a second clock signal from the second optical signal. The first and second optical circuits of the clock recovery loop share at least some common optical circuit elements. The bi-directional optical gate includes a first non-linear optical light mirror circuit for producing a first regenerated signal based on the first optical signal and the first clock signal and a second non-linear optical light mirror circuit for producing a second regenerated signal based on the second optical signal and the second clock signal. The first and second non-linear optical light mirror circuits share at least some common optical circuit elements.

US Patent:

56085710, Mar 4, 1997

Filed:

Oct 5, 1995

Appl. No.:

8/539626

Inventors:

Richard E. Epworth - Sawbridgeworth, GB
Andrew N. Robinson - Plano TX
Moira J. Stewart - Harlow, GB

Assignee:

Northern Telecom Limited - Montreal

International Classification:

H01S 300

US Classification:

359341

Abstract:

An optical amplifier for a wavelength multiplexed transmission system has a set of optically amplifying fibres (26a, 26b) each provided with an associated spectrally selective Bragg reflector (27a, 27b). The amplifying fibres are optically coupled with a coupler (23) such that an optical signal having different spectral components launched into an input (21a) of the coupler is emitted from an output (21b) of the coupler after the different components have propagated through different ones of the amplifying fibres each after reflection in its associated reflector.