David S Alavi

US Patent:

7063260, Jun 20, 2006

Filed:

Nov 4, 2003

Appl. No.:

10/704019

Inventors:

Thomas W. Mossberg - Eugene OR, US
Christoph M. Greiner - Eugene OR, US
Dmitri Iazikov - Springfield OR, US
David S. Alavi - Eugene OR, US

Assignee:

LightSmyth Technologies Inc - Eugene OR

International Classification:

G06K 7/10

US Classification:

235454, 235375, 23546206

Abstract:

A spectrally-encoded label comprises a spectrally-selective optical element having a label spectral signature. The label spectral signature is determined according to a spectral-encoding scheme so as to represent predetermined label information within the spectral encoding scheme. The label emits output light in response to input light selected by the label spectral signature of the optical element. A spectrally-encoded label system further comprises an optical detector sensitive to the output light emitted from the label, and a decoder operatively coupled to the detector for extracting the label information according to the spectral encoding scheme, and may also include a light source providing the input light for illuminating the label.

US Patent:

7341189, Mar 11, 2008

Filed:

Jun 20, 2006

Appl. No.:

11/425369

Inventors:

Thomas W. Mossberg - Eugene OR, US
Christoph M. Greiner - Eugene OR, US
Dmitri Iazikov - Springfield OR, US
David S. Alavi - Eugene OR, US

Assignee:

LightSmyth Technologies Inc - Eugene OR

International Classification:

G06K 7/10

US Classification:

235454, 23546235

Abstract:

A spectrally-encoded label comprises a spectrally-selective optical element having a label spectral signature. The label spectral signature is determined according to a spectral-encoding scheme so as to represent predetermined label information within the spectral encoding scheme. The label emits output light in response to input light selected by the label spectral signature of the optical element. A spectrally-encoded label system further comprises an optical detector sensitive to the output light emitted from the label, and a decoder operatively coupled to the detector for extracting the label information according to the spectral encoding scheme, and may also include a light source providing the input light for illuminating the label.

US Patent:

20030081903, May 1, 2003

Filed:

Oct 30, 2002

Appl. No.:

10/284041

Inventors:

Kerry Vahala - San Gabriel CA, US
Peter Sercel - Pasadena CA, US
Oskar Painter - Pasadena CA, US
David Vernooy - Sierra Madre CA, US
David Alavi - Eugene OR, US

International Classification:

G02B006/26
G02B006/27

US Classification:

385/050000, 385/043000, 385/028000, 385/011000

Abstract:

An optical signal may be received into orthogonal linearly polarized modes of a transmission optical waveguide, the transmission waveguide including first and second transverse-coupling segments thereof. Optical signal polarized along one polarization direction may be substantially completely transferred from the transmission waveguide into a first transverse-coupled waveguide, the first transverse-coupled waveguide being optically transverse-coupled to the first transverse-coupling segment of the transmission waveguide. Optical signal polarized along the other polarization direction may be substantially completely transferred from the transmission waveguide into a second transverse-coupled waveguide, the second transverse-coupled waveguide being optically transverse-coupled to the second transverse-coupling segment of the transmission waveguide. The optical signals carried by the first and second transverse-coupled waveguides may be combined into a single waveguide. The polarization directions of the transmission waveguide may be rotated about 90 between the first and second transverse-coupling segments.

US Patent:

20120179699, Jul 12, 2012

Filed:

Jan 10, 2012

Appl. No.:

13/347646

Inventors:

Roy W. Ward - Eugene OR, US
David S. Alavi - Eugene OR, US

International Classification:

G06F 17/30
G06F 7/00

US Classification:

707754, 707797, 707E17039, 707E17044, 707E17018

Abstract:

A data structure comprises a clump header table and an inline tree data structure. The inline tree, representing filterable data fields of hierarchically organized data records, comprises an alternating sequence of first-level binary string segments, each followed by one or more corresponding second-level binary string segments. Each clump header record includes an indicator of a location in the inline tree of corresponding binary string segments. A dedicated, specifically adapted conversion program generates the clump header file and the inline tree for storage on any computer-readable medium, and the inline tree can be read entirely into RAM to be searched or filtered. A dedicated, specifically adapted search and filter program is employed to list or enumerate retrieved data records. Run-time computer code generation can reduce time required for searching and filtering. One example includes spatial searching and filtering of data records that include spatial coordinates as data fields.

US Patent:

20220271489, Aug 25, 2022

Filed:

Feb 22, 2022

Appl. No.:

17/677888

Inventors:

- Lorton VA, US
David S. Alavi - Eugene OR, US

Assignee:

Microtech Instruments, Inc. - Lorton VA

International Classification:

H01S 3/083
H01S 3/063

Abstract:

A ring optical resonator and one or more input optical waveguides are arranged on a substrate, and are arranged and positioned to establish evanescent optical coupling between them. The ring optical resonator, the substrate, or both include one or more nonlinear optical materials. To detect an electromagnetic signal at frequency νincident on the resonator, an input optical signal at frequency νpropagates along the waveguide and around the resonator. The incident electromagnetic signal and the input optical signal generate one or more sideband optical signals at corresponding optical sideband frequencies ν=ν+νor ν=ν−ν. To generate an electromagnetic signal to propagate away from the resonator, input optical signals at frequencies νand νpropagate along one or more waveguides and around the resonator and generate the electromagnetic signal incident at frequency ν=|ν−ν|.

US Patent:

20190294599, Sep 26, 2019

Filed:

Mar 29, 2019

Appl. No.:

16/370802

Inventors:

- Eugene OR, US
David S. Alavi - Eugene OR, US

International Classification:

G06F 16/22
G06F 16/2458

Abstract:

A method includes generating from a time-series dataset multiple corresponding time-slice datasets. Each time-slice dataset has a corresponding time-slice time index and includes field-value data strings and associated field-value-time-index data strings, or pointers indicating the corresponding strings in an earlier time-slice dataset, that are the latest in the time-series dataset that are also earlier than the corresponding time-slice time index. A query of the time-series dataset for latest data records earlier than a given query time index is performed by using the time-slice datasets to reduce or eliminate the need to directly access or interrogate the time-series dataset.

US Patent:

20170228405, Aug 10, 2017

Filed:

Feb 9, 2016

Appl. No.:

15/019965

Inventors:

- Eugene OR, US
David S. Alavi - Eugene OR, US

International Classification:

G06F 17/30

Abstract:

A method includes generating from a time-series dataset multiple corresponding time-slice datasets. Each time-slice dataset has a corresponding time-slice time index and includes field-value data strings and associated field-value-time-index data strings, or pointers indicating the corresponding strings in an earlier time-slice dataset, that are the latest in the time-series dataset that are also earlier than the corresponding time-slice time index. A query of the time-series dataset for latest data records earlier than a given query time index is performed by using the time-slice datasets to reduce or eliminate the need to directly access or interrogate the time-series dataset.

US Patent:

20150205814, Jul 23, 2015

Filed:

Jan 27, 2015

Appl. No.:

14/607038

Inventors:

- Eugene OR, US
David S. Alavi - Eugene OR, US

International Classification:

G06F 17/30

Abstract:

A data structure comprises a clump header table and an inline tree data structure. The inline tree, representing filterable data fields of hierarchically organized data records, comprises an alternating sequence of first-level binary string segments, each followed by one or more corresponding second-level binary string segments. Each clump header record includes an indicator of a location in the inline tree of corresponding binary string segments. A dedicated, specifically adapted conversion program generates the clump header file and the inline tree for storage on any computer-readable medium, and the inline tree can be read entirely into RAM to be searched or filtered. A dedicated, specifically adapted search and filter program is employed to list or enumerate retrieved data records. Run-time computer code generation can reduce time required for searching and filtering. One example includes spatial searching and filtering of data records that include spatial coordinates as data fields.