Mark K Lowry

US Patent:

20020149817, Oct 17, 2002

Filed:

Mar 29, 2002

Appl. No.:

10/113777

Inventors:

Han Kiliccote - Sunnyvale CA, US
Cuneyt Ozveren - Saratoga CA, US
Mark Lowry - Castro valley CA, US

International Classification:

H04B010/20
H04J014/00
H04J014/02

US Classification:

359/119000, 359/127000

Abstract:

Methods and apparatuses of open ring optical networks are disclosed, as well as optical nodes, for example open intercepts and closed intercepts, supporting open ring optical networks. Open ring optical networks can prevent optical wavelengths from traversing an optical node in an optically transparent network. Optical feedback can be prevented in open ring optical networks, for example optical networks containing optical amplifiers. Coherent crosstalk can be prevented in open ring optical networks. Some open ring networks further allow standard communication protection techniques that are typically associated with rings which are topologically closed. These network architectures can enable low cost-of-maintenance bandwidth upgrades to the entire network.

US Patent:

20020154357, Oct 24, 2002

Filed:

Mar 29, 2002

Appl. No.:

10/112091

Inventors:

Cuneyt Ozveren - Saratoga CA, US
Stephen Shaffer - Alameda CA, US
Mark Lowry - Castro Valley CA, US

International Classification:

H04B010/20
H04J014/00
H04J014/02

US Classification:

359/124000, 359/119000

Abstract:

Methods and apparatus for dynamic bandwidth provisioning in wavelength division multiplexing (WDM) optical ring networks. A plurality of nodes within the network are configured to transmit optical signals at variable wavelengths and receive optical signals at a predetermined wavelength. A network management system computer may be provided to communicate with the network nodes to direct the wavelengths at which each node transmits and receives. A series of one or more lightpath rings within the network are defined by selecting a first plurality of network nodes to provide a channel to support the optical transmission of a communication signal therebetween having a first bandwidth allocation. Each network node within the first plurality of network nodes is instructed upon command by the network management system to transmit an optical signal at a predetermined wavelength that is to be received by only one other network node within the first plurality of network nodes to form a first series of optical links therebetween which in the aggregate form the lightpath ring. Each network node within the second plurality of network nodes is instructed upon command by the network management system to transmit an optical signal at a predetermined wavelength that is to be received by only one other network node within the second plurality of network nodes to form a second series of optical links therebetween which in the aggregate reforms the lightpath ring. Accordingly, the lightpath ring may be reformed upon command by the network management system by altering the number of network nodes within the first plurality of network nodes to define a second plurality of network nodes which dynamically provides the channel with a different bandwidth allocation.

US Patent:

20120250133, Oct 4, 2012

Filed:

Mar 19, 2012

Appl. No.:

13/423498

Inventors:

Richard E. Stewart - San Ramon CA, US
Stephen P. Vernon - Pleasanton CA, US
Paul T. Steele - Livermore CA, US
Mark E. Lowry - Castro Valley CA, US

Assignee:

Lawrence Livermore National Security, LLC - Livermore CA

International Classification:

G02B 26/00

US Classification:

359238

Abstract:

A high sensitivity transient grating ultrafast radiation to optical image converter is based on a fixed transmission grating adjacent to a semiconductor substrate. X-rays or optical radiation passing through the fixed transmission grating is thereby modulated and produces a small periodic variation of refractive index or transient grating in the semiconductor through carrier induced refractive index shifts. An optical or infrared probe beam tuned just below the semiconductor band gap is reflected off a high reflectivity mirror on the semiconductor so that it double passes therethrough and interacts with the radiation induced phase grating therein. A small portion of the optical beam is diffracted out of the probe beam by the radiation induced transient grating to become the converted signal that is imaged onto a detector.

US Patent:

58570470, Jan 5, 1999

Filed:

Mar 20, 1996

Appl. No.:

8/618935

Inventors:

Oliver T. Strand - Castro Valley CA
Mark E. Lowry - Castro Valley CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

G02B 0000

US Classification:

385 88

Abstract:

The Automated Fiber Pigtailing Machine (AFPM) aligns and attaches optical fibers to optoelectonic (OE) devices such as laser diodes, photodiodes, and waveguide devices without operator intervention. The so-called pigtailing process is completed with sub-micron accuracies in less than 3 minutes. The AFPM operates unattended for one hour, is modular in design and is compatible with a mass production manufacturing environment. This machine can be used to build components which are used in military aircraft navigation systems, computer systems, communications systems and in the construction of diagnostics and experimental systems.

US Patent:

52987558, Mar 29, 1994

Filed:

Feb 1, 1993

Appl. No.:

8/011635

Inventors:

Craig R. Wuest - Danville CA
Mark E. Lowry - Castro Valley CA

Assignee:

The United States of America as represented by the United States
Department of Energy - Washington DC

International Classification:

G01T 1185

US Classification:

250389

Abstract:

An optical ionization detector wherein a beam of light is split so that one arm passes through a fiber optics and the other arm passes through a gas-filled region, and uses interferometry to detect density changes in a gas when charged particles pass through it. The gas-filled region of the detector is subjected to a high electric field and as a charged particle traverses this gas region electrons are freed from the cathode and accelerated so as to generate an electron avalanche which is collected on the anode. The gas density is effected by the electron avalanche formation and if the index or refraction is proportional to the gas density the index will change accordingly. The detector uses this index change by modulating the one arm of the split light beam passing through the gas, with respect to the other arm that is passed through the fiber optic. Upon recombining of the beams, interference fringe changes as a function of the index change indicates the passage of charged particles through the gaseous medium.