Michael Keith Larson

US Patent:

6419404, Jul 16, 2002

Filed:

Jun 30, 2000

Appl. No.:

09/607992

Inventors:

Robert J. Deri - Pleasanton CA
Michael D. Pocha - Livermore CA
Michael C. Larson - Goleta CA
Henry E. Garrett - Livermore CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

G02B 636

US Classification:

385 89, 385 39, 385 49, 385 91

Abstract:

A compact multiwavelength transmitter module for multimode fiber optic ribbon cable, which couples light from an MÃN array of emitters onto N fibers, where the M wavelength may be distributed across two or more vertical-cavity surface-emitting laser (VCSEL) chips, and combining emitters and multiplexer into a compact package that is compatible with placement on a printed circuit board. A key feature is bringing together two emitter arrays fabricated on different substratesâeach array designed for a different wavelengthâinto close physical proximity. Another key feature is to compactly and efficiently combine the light from two or more clusters of optical emitters, each in a different wavelength band, into a fiber ribbon.

US Patent:

20020075920, Jun 20, 2002

Filed:

Dec 15, 2000

Appl. No.:

09/738534

Inventors:

Sylvia Spruytte - Palo Alto CA, US
Michael Larson - Walnut Creek CA, US
James Harris - Stanford CA, US
Christopher Coldren - Sunnyvale CA, US

International Classification:

H01S005/00
H01S003/08

US Classification:

372/045000, 372/046000, 372/096000

Abstract:

In an active region of an optical-electronic semiconductor device, nitrogen is incorporated in a barrier adjacent a GaNAs-based (e.g., GaInNAs) quantum well to improve device performance at wavelength bands above 1.2 microns. In a specific example embodiment, a mirror or cladding layer is grown over the active region in a manner that removes nitrogen complex otherwise present with Ga—N bonds in the active region. The embodiment can be implemented as one of a number of configurations including vertical cavity surface emitting lasers (VCSEL) and edge emitting lasers.

US Patent:

20050202614, Sep 15, 2005

Filed:

Mar 9, 2005

Appl. No.:

11/075951

Inventors:

Sylvia Spruytte - Palo Alto CA, US
Michael Larson - Walnut Creek CA, US
James Harris - Stanford CA, US
Christopher Coldren - Sunnyvale CA, US

International Classification:

H01L021/338
H01S005/00

US Classification:

438167000, 438021000, 438047000

Abstract:

In an active region of an optical-electronic semiconductor device, nitrogen is incorporated in a barrier adjacent a GaNAs-based (e.g., GaInNAs) quantum well to improve device performance at wavelength bands above 1.2 microns. In a specific example embodiment, a mirror or cladding layer is grown over the active region in a manner that removes nitrogen complex otherwise present with Ga—N bonds in the active region. The embodiment can be implemented as one of a number of configurations including vertical cavity surface emitting lasers (VCSEL) and edge emitting lasers.

US Patent:

20140010248, Jan 9, 2014

Filed:

Jul 5, 2012

Appl. No.:

13/542547

Inventors:

Michael C. Larson - Oakland CA, US

Assignee:

JDS Uniphase Corporation - Milpitas CA

International Classification:

H01S 3/10
G02B 6/34

US Classification:

372 20, 385 37

Abstract:

A spatially modulated waveguide Bragg grating mirror is suspended over a substrate by plurality of fingers extending laterally away from the waveguide centerline. The positions of the fingers are coordinated with the positions of crests and valleys of amplitude or phase modulation of the Bragg grating, to avoid disturbing the Bragg grating when it is tuned by heating. When the Bragg grating is heated, the heat flows through the fingers creating a quasi-periodic refractive index variation along the Bragg grating due to quasi-periodic temperature variation created by the heat flow from the grating through the supporting fingers. Due to coordination of the positions of supporting fingers with positions of the crests and valleys of modulation, the optical phase coherence is maintained along the Bragg grating, so that the spectral lineshape or filtering property of the Bragg grating is substantially preserved.

US Patent:

20230070789, Mar 9, 2023

Filed:

Jul 18, 2022

Appl. No.:

17/867198

Inventors:

- Los Angeles CA, US
Laszlo Takacs - Fremont CA, US
Michael Larson - Fremont CA, US
Artem Mishin - Fremont CA, US

International Classification:

H04B 3/54
H05B 47/185

Abstract:

A network communication module (NCM), comprising: (a) a housing configured to connect to an outlet containing power wiring; (b) a PLC interface in said housing and electrically connected to said power wiring; (c) a legacy control interface configured for electrical connection with one or more downstream devices; (d) a microprocessor and memory configured for causing said microprocessor to perform at least the following steps: communicate over the powerline via PLC to at least receive control signals or transmit data related to said one or more downstream devices, and communicate with said one or more downstream devices via said legacy control interface to transmit control signals or receive said data from one or more said downstream devices.

US Patent:

20230073927, Mar 9, 2023

Filed:

Nov 14, 2022

Appl. No.:

18/054989

Inventors:

- San Jose CA, US
Duanhua KONG - Milpitas CA, US
Michael C. LARSON - Oakland CA, US
Amit MIZRAHI - San Jose CA, US

International Classification:

H01S 5/024
H01S 5/068
H01S 5/22
H01S 5/06

Abstract:

In some implementations, a thermally-controlled photonic structure may include a suspended region that is suspended over a substrate; a plurality of bridge elements connected to the suspended region and configured to suspend the suspended region over the substrate, where a plurality of openings are defined between the plurality of bridge elements; and at least one heater element having a modulated width disposed on the suspended region. The at least one heater element having the modulated width may include at least one section of a greater width and at least one section of a lesser width. The at least one section of the greater width may be in alignment with an opening of the plurality of openings and the at least one section of the lesser width may be in alignment with a bridge element of the plurality of bridge elements.

US Patent:

20210344166, Nov 4, 2021

Filed:

Sep 25, 2020

Appl. No.:

17/032787

Inventors:

- San Jose CA, US
Duanhua KONG - Milpitas CA, US
Michael C. LARSON - Oakland CA, US
Amit MIZRAHI - San Jose CA, US

International Classification:

H01S 5/068
H01S 5/06
H01S 5/22

Abstract:

In some implementations, a thermally-controlled photonic structure may include a suspended region that is suspended over a substrate; a plurality of bridge elements connected to the suspended region and configured to suspend the suspended region over the substrate, where a plurality of openings are defined between the plurality of bridge elements; and at least one heater element having a modulated width disposed on the suspended region. The at least one heater element having the modulated width may include at least one section of a greater width and at least one section of a lesser width. The at least one section of the greater width may be in alignment with an opening of the plurality of openings and the at least one section of the lesser width may be in alignment with a bridge element of the plurality of bridge elements.

US Patent:

20210263387, Aug 26, 2021

Filed:

Jun 30, 2020

Appl. No.:

16/917113

Inventors:

- San Jose CA, US
Michael C. LARSON - Oakland CA, US

International Classification:

G02F 1/225
G02B 6/293

Abstract:

A nested Mach-Zehnder device may comprise a parent pre-stage interferometer, a parent interferometer coupled to the parent pre-stage interferometer, a first child pre-stage interferometer, a first child interferometer coupled to the first child pre-stage interferometer, a second child pre-stage interferometer, a second child interferometer coupled to the second child pre-stage interferometer, wherein a phase of each interferometer is electrically adjustable. The nested Mach-Zehnder device may comprise one or more components to: determine a performance parameter associated with a constellation diagram generated by the nested Mach-Zehnder device; determine that the performance parameter does not satisfy a threshold, and cause a phase of at least one pre-stage interferometer, of the parent pre-stage interferometer, the first child pre-stage interferometer, or the second child pre-stage interferometer, to be electrically adjusted to cause the performance parameter to satisfy the threshold.