Gregory A Fish

US Patent:

6590924, Jul 8, 2003

Filed:

May 4, 2001

Appl. No.:

09/848791

Inventors:

Gregory A. Fish - Santa Barbara CA
Larry A. Coldren - Santa Barbara CA

Assignee:

Agility Communications, Inc. - Goleta CA

International Classification:

H01S 308

US Classification:

372 96, 372 20, 372 50, 372108, 356301, 385 37, 438 34

Abstract:

A tunable laser comprised of a gain section for creating a light beam by spontaneous emission over a bandwidth, a phase section for controlling the light beam around a center frequency of the bandwidth, a cavity for guiding and reflecting the light beam, a front mirror bounding an end of the cavity, and a back mirror bounding an opposite end of the cavity. The back mirror has a approximately equal to , where is an effective coupling constant and is the maximum amount of propagation loss anticipated for an amount of peak tuning required, and a length of the back mirror is made to produce greater than approximately 80% reflectivity.

US Patent:

6614819, Sep 2, 2003

Filed:

Jul 12, 2000

Appl. No.:

09/614376

Inventors:

Gregory Fish - Santa Barbara CA
Larry Coldren - Santa Barbara CA

Assignee:

Agility Communications, Inc. - Goleta CA

International Classification:

H01S 310

US Classification:

372 26, 372 32

Abstract:

A method of converting an optical wavelength includes providing a wavelength converter assembly with a photodetector and a laser with a common epitaxial structure. The expitaxial structure has areas of differing bandgap. An optical input having a first wavelength at the wavelength converter assembly is absorbed. A first electrical signal is generated from the photodetector in response to the optical input. The first electrical signal is conditioned to produce a conditioned first electrical signal. A second electrical signal is generated from the conditioned first electrical signal. A laser output is generated from a gain medium of the laser at a second wavelength in response to the second electrical signal.

US Patent:

6628690, Sep 30, 2003

Filed:

Jul 12, 2000

Appl. No.:

09/614378

Inventors:

Gregory Fish - Santa Barbara CA
Larry Coldren - Santa Barbara CA

Assignee:

Agility Communications, Inc. - Goleta CA

International Classification:

H01J 5026

US Classification:

372 50

Abstract:

A laser assembly includes an epitaxial structure formed on a substrate. A laser resonator, a modulator and a coupler are formed in the epitaxial structure. The coupler is positioned to receive and adjust an output received from the modulator.

US Patent:

6654400, Nov 25, 2003

Filed:

Jul 12, 2000

Appl. No.:

09/614224

Inventors:

Thomas Beck Mason - Middletown NJ
Gregory Fish - Santa Barbara CA
Larry Coldren - Santa Barbara CA

Assignee:

Agility Communications, Inc. - Goleta CA

International Classification:

H01S 5026

US Classification:

372 50, 372 20, 438 22

Abstract:

A method of making a diode laser assembly provides a substrate. An epitaxial structure is formed on the substrate. Different areas of the epitaxial structure have different optical properties. A laser, a modulator and a coupler are formed in the epitaxial structure.

US Patent:

6658035, Dec 2, 2003

Filed:

Jul 12, 2000

Appl. No.:

09/614375

Inventors:

Thomas Beck Mason - Middletown NJ
Gregory Fish - Santa Barbara CA
Larry Coldren - Santa Barbara CA

Assignee:

Agility Communications, Inc. - Goleta CA

International Classification:

H01S 5026

US Classification:

372 50, 372 43

Abstract:

A laser assembly includes an epitaxial structure formed on a substrate. A separately controllable tunable laser resonator and external optical amplifier are formed in the epitaxial structure. At least a portion of the laser and amplifier share a common waveguide, which may have non-uniform optical or geometrical properties along the waveguide centerline or across a normal to the centerline.

US Patent:

6687278, Feb 3, 2004

Filed:

Jul 12, 2000

Appl. No.:

09/614665

Inventors:

Thomas Beck Mason - Middletown NJ
Gregory Fish - Santa Barbara CA
Larry Coldren - Santa Barbara CA

Assignee:

Agility Communications, Inc. - Goleta CA

International Classification:

H01S 5026

US Classification:

372 50, 372 20, 438 22

Abstract:

A method of generating an optical signal provides a diode laser assembly including an epitaxial structure formed on a substrate. A laser and an amplifier are formed in the epitaxial structure. At least a portion of the laser and amplifier share a common waveguide. A tunable laser output is produced from the laser. The laser output is coupled into the amplifier along the common waveguide. An optical signal is generated from the amplifier.

US Patent:

6714566, Mar 30, 2004

Filed:

Jan 3, 2002

Appl. No.:

09/914728

Inventors:

Larry A. Coldren - Santa Barbara CA
Thomas Gordon Beck Mason - San Jose CA
Gregory Fish - Santa Barbara CA

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

H01S 310

US Classification:

372 20, 372 9

Abstract:

A wavelength monitor is provided based on the transmission response of an optical filter. The monitor provides feedback to the laser enabling it to lock to any given wavelength within its tuning range. The invention is also a process for integrating the wavelength monitor directly on chip with a variety of tunable semiconductor lasers. The invention also comprises a method for controlling the wavelength of a tunable laser by using a wavelength monitor to measure the output light and provide feedback to a control system. The laser and wavelength monitor are integrated together on a single indium phosphide chip. The wavelength monitor comprises a filter with a wavelength dependent transmission function and a pair of detectors. One detector is illuminated with light that has passed through the filter and the other provides a reference to measure the input intensity. Taking the ratio of the filtered light level to the unfiltered light provides a wavelength dependent wavelength.

US Patent:

6909734, Jun 21, 2005

Filed:

Jun 1, 2001

Appl. No.:

09/872438

Inventors:

Larry A. Coldren - Santa Barbara CA, US
Gregory A. Fish - Santa Barbara CA, US
Michael C. Larson - Santa Barbara CA, US

Assignee:

Agility Communications, Inc. - Goleta CA

International Classification:

H01S003/08

US Classification:

372 96, 372 43, 372 46, 372 50

Abstract:

A tunable laser is disclosed including a gain section for creating a light beam over a bandwidth, a phase section for controlling the light beam around a center frequency of the bandwidth, a waveguide for guiding and reflecting the light beam in a cavity including a relatively low energy bandgap separate-confinement-heterostructure (SCH), a front mirror bounding an end of the cavity and a back mirror bounding an opposite end of the cavity wherein gain is provided by at least one of the group comprising the phase section, the front mirror and the back mirror.