William Smith Stephens

US Patent:

6388782, May 14, 2002

Filed:

Nov 12, 1998

Appl. No.:

09/190675

Inventors:

William Edward Stephens - Belle Mead NJ
Joseph Hy Abeles - Highland Park NJ
John Charles Connolly - Clarksburg NJ

Assignee:

Sarnoff Corporation - Princeton NJ

International Classification:

H04J 1402

US Classification:

359124, 359128, 372 18

Abstract:

A wavelength division multiplex optical crossconnect system and add/drop multiplexer including a dense wavelength division multiplexed (DWDM) source which preferably includes a multiwavelength mode-locked (MWML) external cavity laser as a fundamental sub-circuit for optically crossconnecting several multi-wavelength data channels onto similar data channels having an interchanged set of optical wavelengths. The optical crossconnect architecture allows the rearrangement of multiple logical channels in a timely manner to support protection switching, traffic grooming, and other telecommunications network functions. The crossconnect architecture further supports multiple physical fibers into and out of the crossconnect, where each fiber carries multiple logical channels on multiple wavelengths of light which are assigned particular wavelength carriers, crossconnected onto any other physical fiber, and assigned another wavelength carrier. The add/drop multiplexer provides a completely optical passthrough for received optical signals.

US Patent:

6704283, Mar 9, 2004

Filed:

Feb 17, 2000

Appl. No.:

09/506096

Inventors:

Thomas Michael Stiller - Ewing NJ
William Edward Stephens - Belle Mead NJ
Nisha Pauline Newman - North Brunswick NJ

Assignee:

Sarnoff Corporation - Princeton NJ

International Classification:

H04J 324

US Classification:

370238, 370254, 370392, 370400, 455445, 709242, 709243

Abstract:

A method of transmitting a message from a source node to a destination node in a small, wireless network having up to N nodes in which each message has appended thereto concise network configuration data which eliminates the need for routing protocols without adding significant overhead to the network communications. The method includes the steps of creating for each node a route table containing a count of the number of transmission hops necessary to reach each destination node and a node number of a neighboring node forming a next link in a chain of hops to each destination node, where the node number identifies a unique bit in an N bit address mask. Routing data is appended to the message data which includes an N bit destination word identifying the destination node or nodes, an N bit route word including a logical OR of the address mask of the relay node or nodes, and a route update message identifying what the current node knows about the network configuration. The number of N bit words in the route update message indicates a maximum number of transmission hops away from the current node that the current node could know about the network configuration. Upon receipt of such message data and its routing data, all receiving nodes update their route tables from the route update message.

US Patent:

6801941, Oct 5, 2004

Filed:

Aug 7, 2000

Appl. No.:

09/633669

Inventors:

William Edward Stephens - Belle Mead NJ
Harvey Waldman - Yardley PA
Thomas Michael Stiller - Ewing NJ
Nisha Pauline Newman - North Brunswick NJ

Assignee:

Sarnoff Corporation - Princeton NJ

International Classification:

G06F 15173

US Classification:

709225, 709226, 709227, 709245, 713150, 713155, 713200

Abstract:

A method of assigning a unique IP address to a user of a mobile communication device in an OBS network allows for the dynamic assignment of IP addresses to users entering the OBS network. The OBS network includes a plurality of interconnected OBSs where each of the OBSs includes a user database including an OBS identifier, user identifier, assigned IP address, MAC hardware address, and beam identifier for each user in the network. The OBS network also includes a master ticketing authority that maintains a database of unique IP address that may be assigned to users entering the network, a gateway, a master routing database, and at least one mobile communication device in contact with an OBS. Users in the network are also authenticated through the transmittal of encrypted random numbers between a user authentication site and a mobile communication device.

US Patent:

8644323, Feb 4, 2014

Filed:

Feb 7, 2012

Appl. No.:

13/368131

Inventors:

Narayanan Natarajan - Marlboro NJ, US
Anindo Bagchi - Ocean NJ, US
William Edward Stephens - Bel Air MD, US
Stephen Leanheart - Ellicott City MD, US

Assignee:

Telcordia Technologies, Inc. - Piscataway NJ

International Classification:

H04L 12/28
H04B 7/185
H04W 4/00
H04N 7/20

US Classification:

370400, 455 121, 455427, 725 63

Abstract:

In a distributed management scheme for LEO satellite networks interactions between a satellite and the designated fixed center occur according to a time schedule and only when the designated center is in the coverage area of the payload. For exception/alarm reporting and real-time configuration updates the interaction varies with time. Interactions of this type occur between a satellite and the management center that is “nearest” to the payload or satellite at the time instant at which the network event occurs or configuration upload is needed. The nearest management center for a payload is the center that can be reached from the payload with fewest number of crosslink hops. A central network operation center determines, prior to payload launch, the association between satellites and management centers for routine information exchange, and the nearest management center for the payload for different snapshots of time.

US Patent:

20120134261, May 31, 2012

Filed:

May 31, 2011

Appl. No.:

13/149106

Inventors:

Narayanan Natarajan - Marlboro NJ, US
Anindo Bagchi - Ocean NJ, US
William E. Stephens - Bel Air MD, US

Assignee:

TELCORDIA TECHNOLOGIES, INC. - Piscataway NJ

International Classification:

H04W 28/02

US Classification:

370225

Abstract:

A payload switching architecture for LEO satellite networks minimizes processing and storage requirements of payloads for deployment as small primary or secondary payloads, payloads perform only forwarding functions. Forwarding rules are provisioned in the payloads enabling them to reroute in case of failures or congestion without intervention from a ground station. Configuration rules are provisioned in the payloads enabling them to dynamically establish and remove interplane crosslinks without intervention from a ground station. The central network operations center on the ground computes forwarding rules and configuration rules for payloads and uploads the rules to the payloads.

US Patent:

20120263042, Oct 18, 2012

Filed:

Oct 4, 2011

Appl. No.:

13/252711

Inventors:

Narayanan Natarajan - Marlboro NJ, US
Anindo Bagchi - Ocean NJ, US
William E. Stephens - Bel Air MD, US

Assignee:

TELCORDIA TECHNOLOGIES, INC. - Piscataway NJ

International Classification:

H04L 12/26

US Classification:

370238

Abstract:

In Low Earth Orbit (LEO) satellite networks data routes for point to point and point to multipoint communication sessions in LEO satellite networks are determined by considering session bandwidth, priority, and the constantly changing terminal-satellite and satellite-satellite connectivity. Multiple routes are computed for a session to facilitate automatic adaptive rerouting by satellite payloads when they encounter network failures or congestion conditions.

US Patent:

D452021, Feb 2, 1999

Filed:

Mar 31, 1998

Appl. No.:

D/085843

Inventors:

Michael J. Fattori - Bordentown NJ
Joseph P. Polak - Swainton NJ
Michael SaFranko - Bordentown NJ
Arthur W. Stephens - Bordentown NJ
Jeffrey C. Stephens - Robbinsville NJ
William H. Stephens - Toms River NJ

Assignee:

Princeton Tectonics, Inc. - Bordentown NJ

International Classification:

2606

US Classification:

D26 39

US Patent:

47962666, Jan 3, 1989

Filed:

Dec 21, 1987

Appl. No.:

7/135916

Inventors:

Thomas C. Banwell - Madison Borough NJ
William E. Stephens - Basking Ridge NJ

Assignee:

Bell Communications Research, Inc. - Livingston NJ

International Classification:

H01S 300

US Classification:

372 38

Abstract:

The laser driver circuit of the invention stabilizes the low operating output power level of a laser (301) modulated by a digital input signal, at a fixed preset value L. sub. o, by automatically adjusting the bias current, I. sub. b, supplied to the laser to compensate for variations in the laser threshold due to temperature changes and aging. The circuit includes a fast photodetector (401) which is responsive to the modulated light output of the laser. The photodetector output is combined (306, 308) with a data sensitive reference signal (i. sub. r) and a preset level setting input signal (i. sub. o) which is equal to. eta. times the desired low operating output power level L. sub. o, where. eta. is the coupling coefficient of the photodetector. Reference signal i. sub.