William C Law

US Patent:

7049843, May 23, 2006

Filed:

Mar 10, 2005

Appl. No.:

11/077691

Inventors:

Christopher P. Yakymyshyn - Seminole FL, US
William Q. Law - Beaverton OR, US
William A. Hagerup - Portland OR, US

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G01R 31/26

US Classification:

324765, 324753

Abstract:

A signal acquisition probing system uses a micro-cavity laser to acquire an electrical signal from a device under test. The micro-cavity laser has VCSEL gain mediums and an electro-optic optical resonant cavity. The micro-cavity laser is pumped by an external laser source and generates polarized frequency modulated optical signals derived from the device under test electrical signal creating an electro-magnetic field distribution in electro-optic material in the micro-cavity laser that overlaps the optical path of the polarized optical signals propagating in the electro-optic material. The polarized frequency modulated optical signals are coupled to an optical receiver which converts the polarized frequency modulated optical signals to an electrical signal. The electrical signal is coupled to measurement test instrument for processing and displaying of the electrical signal.

US Patent:

7187187, Mar 6, 2007

Filed:

Mar 10, 2005

Appl. No.:

11/077692

Inventors:

Christopher P. Yakymyshyn - Seminole FL, US
William Q. Law - Beaverton OR, US
William A. Hagerup - Portland OR, US

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G01R 31/302
G01R 31/308

US Classification:

324753, 324750

Abstract:

A signal acquisition probing system uses a micro-cavity laser to acquire an electrical signal from a device under test. The micro-cavity laser has a VCSEL gain medium and an electro-optic optical resonant cavity. The micro-cavity laser is pumped by an external laser source and generates a frequency modulated optical signal derived from the device under test electrical signal creating an electro-magnetic field distribution in electro-optic material in the micro-cavity laser that overlaps the optical path of the optical signal propagating in the electro-optic material. The frequency modulated optical signal is coupled to an optical receiver which converts the frequency modulated optical signal to an electrical signal. The electrical signal is coupled to measurement test instrument for processing and displaying of the electrical signal.

US Patent:

7221813, May 22, 2007

Filed:

Mar 10, 2005

Appl. No.:

11/077787

Inventors:

Christopher P. Yakymyshyn - Seminole FL, US
William Q. Law - Beaverton OR, US
William A. Hagerup - Portland OR, US
Timothy R. Piwonka-Corle - Portland OR, US

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G02B 6/00
G01R 31/00
G01B 9/02

US Classification:

385 12, 385 2, 385 8, 385 39, 385 40, 385 14, 324501, 356454

Abstract:

A signal acquisition probing system uses an optical cavity to acquire a signal under test. The probing system has an optical transmitter and receiver that are coupled to the optical cavity via an optical transmission system. The optical cavity has an electrode structure having apertures formed in the optical cavity that are parallel to propagation path of the optical signal within the cavity. A modulated optical signal is generated by the optical cavity in response to the signal under test creating an electro-magnetic field distribution in electro-optic material in the optical cavity that overlaps the optical path of the optical signal propagating in the optical cavity which varies the index of refraction of electro-optic material in the optical path. The signal acquisition probing system is connected to a measurement instrument to form a voltage measurement system.

US Patent:

7251265, Jul 31, 2007

Filed:

Mar 10, 2005

Appl. No.:

11/077710

Inventors:

Christopher P. Yakymyshyn - Seminole FL, US
William Q. Law - Beaverton OR, US
William A. Hagerup - Portland OR, US

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

H01S 3/08

US Classification:

372108, 257 86, 385129

Abstract:

An optically pumped micro-cavity laser has an optical gain cavity and an optical resonant cavity. The optical gain cavity has a gain medium disposed that generates an optical output in response to an optical pump signal. The optical resonant cavity has an electro-optic material in which is disposed an electrode structure with first and second apertures disposed generally parallel to an optical signal propagating within the electro-optic material. Electrically conductive material is disposed within the apertures coupling an electrical signal to the optical cavity. Optically reflective material is disposed on the opposing surfaces of the micro-cavity laser and between the optical gain cavity and the optical resonant cavity.

US Patent:

7310455, Dec 18, 2007

Filed:

Mar 10, 2005

Appl. No.:

11/077788

Inventors:

Christopher P. Yakymyshyn - Seminole FL, US
Timothy R. Piwonka-Corle - Portland OR, US
William Q. Law - Beaverton OR, US
William A. Hagerup - Portland OR, US

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G02B 6/00
G02F 1/07

US Classification:

385 12, 359256

Abstract:

A variable attenuation signal acquisition probing system and voltage measurement system uses an optical cavity to acquire a signal under test. The probing system has an optical transmitter and receiver that are coupled to the optical cavity via an optical transmission system. The optical cavity has an electrode structure having apertures formed in the optical cavity that are parallel to propagation path of the optical signal within the cavity. A modulated optical signal is generated by the optical cavity in response to the signal under test creating an electromagnetic field distribution in electro-optic material in the optical cavity that overlaps the optical path of the optical signal propagating in the optical cavity which varies the index of refraction of electro-optic material in the optical path. Changes in the polarization state of the optical signal attenuates the magnitude of the output electrical signal of the optical receiver.

US Patent:

7424177, Sep 9, 2008

Filed:

Mar 2, 2007

Appl. No.:

11/681709

Inventors:

Christopher P. Yakymyshyn - Seminole FL, US
Timothy R. Piwonka-Corle - Portland OR, US
William Q. Law - Beaverton OR, US
William A. Hagerup - Portland OR, US

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G02B 6/00

US Classification:

385 12

Abstract:

A variable attenuation signal acquisition probing system and voltage measurement system uses an optical cavity to acquire a signal under test. The probing system has an optical transmitter and receiver that are coupled to the optical cavity via an optical transmission system. The optical cavity has an electrode structure having apertures formed in the optical cavity that are parallel to propagation path of the optical signal within the cavity. A modulated optical signal is generated by the optical cavity in response to the signal under test creating an electro-magnetic field distribution in electro-optic material in the optical cavity that overlaps the optical path of the optical signal propagating in the optical cavity which varies the index of refraction of electro-optic material in the optical path. Changes in the polarization state of the optical signal attenuates the magnitude of the output electrical signal of the optical receiver.

US Patent:

20050201684, Sep 15, 2005

Filed:

Mar 10, 2005

Appl. No.:

11/077649

Inventors:

Christopher Yakymyshyn - Seminole FL, US
William Law - Beaverton OR, US
William Hagerup - Portland OR, US

International Classification:

G02F001/035

US Classification:

385040000

Abstract:

An electrode structure for electro-optic material used in optical cavities is described. The electrode structure has first and second apertures disposed generally parallel to an optical signal propagating within the electro-optic material. Electrically conductive material is disposed within the apertures coupling an electrical signal to the electro-optic material.

US Patent:

20050201685, Sep 15, 2005

Filed:

Mar 10, 2005

Appl. No.:

11/077705

Inventors:

Christopher Yakymyshyn - Seminole FL, US
William Law - Beaverton OR, US
William Hagerup - Portland OR, US

International Classification:

G02B006/26

US Classification:

385040000

Abstract:

An optical cavity having an electro-optic material disposed between opposing optically reflective material has an electrode structure with first and second apertures disposed generally parallel to an optical signal propagating within the electro-optic material. Electrically conductive material is disposed within the apertures coupling an electrical signal to the optical cavity.