John J Stronczer

US Patent:

6389050, May 14, 2002

Filed:

Jun 11, 2001

Appl. No.:

09/878736

Inventors:

John J. Stronczer - Mattawan MI

Assignee:

Applied Micro Circuits Corporation - San Diego CA

International Classification:

H01S 300

US Classification:

372 3802, 372 3803, 372 3807, 359152, 359153, 315209 R, 315209 T

Abstract:

High-speed driver circuits interface with and enhance the performance of vertical-cavity surface-emitting laser (VCSEL) diodes used within fiber optic communication systems, according to embodiments of the invention. A reference diode is formed from a first transistor, and a first current mirror sets a modulation current through the reference diode for driving a light-emitting device. A second current mirror sets a reference biasing current to maintain a constant bias of the reference diode. A first capacitor, charged by a differential amplifier and coupled to the reference diode, supplies complementary charge to the reference diode during differential input voltage transitions. Components of the driver circuit provide asymmetrical operation of the laser, allowing rapid light-emitting-device turn-on and turn-off.

US Patent:

6512617, Jan 28, 2003

Filed:

Feb 3, 1999

Appl. No.:

09/243583

Inventors:

Todd M. Tanji - Egan MN
John J. Stronczer - Mattawan MI

Assignee:

Applied Micro Circuits Corporation - San Diego CA

International Classification:

H04B 1000

US Classification:

359152

Abstract:

An optical transceiver system includes circuitry including a light-emitting device, a driver for the light-emitting device being coupled to the light-emitting device for providing activating power to said light-emitting device and an optical detector disposed to receive light emitted from the light-emitting device, said circuitry being substantially constructed using CMOS technology. A calibration interface is coupled to the circuitry for automatically executing an iterative cycle for a calibration of optical link parameters. And, an optical loop-back is included for optically coupling the light-emitting device and the optical detector, the optical detector receiving light emitted by the light-emitting device, the light emission being selectively stimulated by the calibration interface, the received light emission being communicated to the calibration interface for comparison with a known light signal. A method of automatic calibration and control of optical link parameters in a VCSEL-based optical transceiver is included.

US Patent:

6825964, Nov 30, 2004

Filed:

Oct 22, 2002

Appl. No.:

10/277290

Inventors:

Prashant Singh - Eden Prairie MN
Helga Foulk - Ambler PA
Scott Redinger - Breinigsville PA
Todd Tanji - Eagan MN
Keith Maile - New Brighton MN
John Stronczer - Minneapolis MN

Assignee:

T-Networks, Inc. - Allentown PA
AMCC - San Diego CA

International Classification:

G02F 103

US Classification:

359248, 372 43, 385 2

Abstract:

Drive circuitry to provide a DC bias voltage and a high frequency modulation current to an electroabsorption modulator (EAM), including a high frequency modulation current source, a coupling capacitor, and a first DC lead. The drive circuitry may include termination circuitry. One lead of the high frequency modulation current source is electrically coupled to the first semiconductor type contact of the EAM and the other lead of the high frequency modulation current source is electrically coupled to an AC ground. The coupling capacitor includes a first electrode electrically coupled to the second semiconductor type contact of the EAM, a second electrode electrically coupled to the AC ground, and a dielectric layer between the electrodes. The first DC lead is electrically coupled to the EAM-side capacitor electrode and configured to be coupled to a first DC potential.

US Patent:

6836350, Dec 28, 2004

Filed:

Mar 5, 2004

Appl. No.:

10/793971

Inventors:

Prashant Singh - Eden Prairie MN
Helga Foulk - Ambler PA
Scott Redinger - Breinigsville PA
Todd Tanji - Eagan MN
Keith Maile - New Brighton MN
John Stronczer - Minneapolis MN

Assignee:

T-Networks, Inc. - Allentown PA
AMCC - San Diego CA

International Classification:

G02F 101

US Classification:

359240, 359245, 359246, 359248, 438718

Abstract:

Drive circuitry to provide a DC bias voltage and a high frequency modulation current to an electroabsorption modulator (EAM), including a high frequency modulation current source, a coupling capacitor, and a first DC lead. The drive circuitry may include termination circuitry. One lead of the high frequency modulation current source is electrically coupled to the first semiconductor type contact of the EAM and the other lead of the high frequency modulation current source is electrically coupled to an AC ground. The coupling capacitor includes a first electrode electrically coupled to the second semiconductor type contact of the EAM, a second electrode electrically coupled to the AC ground, and a dielectric layer between the electrodes. The first DC lead is electrically coupled to the EAM-side capacitor electrode and configured to be coupled to a first DC potential.

US Patent:

6879608, Apr 12, 2005

Filed:

Mar 31, 2003

Appl. No.:

10/404908

Inventors:

Robert John Schuelke - Lakeville MN, US
John J. Stronczer - Minneapolis MN, US

Assignee:

Applied Micro Circuits Corporation - San Diego CA

International Classification:

H01S003/00

US Classification:

372 3802, 372 3807

Abstract:

A laser driver includes two DC-coupled differential drive circuits in which the common mode voltage of the first differential drive circuit is maintained a level affording a high compliance voltage for a laser diode driven by the second differential drive circuit. This is accomplished by means of an operational amplifier which compares the common mode voltage of the second differential drive circuit to a reference voltage. The operational amplifier operates in a closed-loop configuration to draw current through a common mode bias resistor in the first differential drive circuit in order to force the common mode voltage of the second differential drive circuit to a desired value determined by the reference voltage.

US Patent:

60378417, Mar 14, 2000

Filed:

Oct 7, 1998

Appl. No.:

9/168027

Inventors:

Todd M. Tanji - Egan MN
John J. Stronczer - Mattawan MI

Assignee:

Applied Micro Circuits Corporation - San Diego CA

International Classification:

H03F 308
H01J 4014

US Classification:

330308

Abstract:

A transimpedance amplifier according to the present invention is designed for high-speed fiber optic communications. The transimpedance amplifier preferably includes an input stage, a second stage and a bias generator. The input stage is operably coupled to the second stage and has an input impedance. The second stage has an output impedance. The bias generator is operably coupled to the input stage and the second stage, and operates to bias the input stage and second stage such that the input impedance substantially matches the output impedance. In this manner, the input and output impedances of a transimpedance amplifier of a fiber optics communication receiver are controllable to a desired impedance for interfacing with a transmission line.

US Patent:

62721607, Aug 7, 2001

Filed:

Feb 3, 1999

Appl. No.:

9/243585

Inventors:

John J. Stronczer - Mattawan MI

Assignee:

Applied Micro Circuits Corporation - San Diego CA

International Classification:

H01S 300

US Classification:

372 3802

Abstract:

High-speed driver circuits interface with and enhance the performance of vertical-cavity surface-emitting laser (VCSEL) diodes used within fiber optic communication systems, according to embodiments of the invention. A reference diode is formed from a first transistor, and a first current mirror sets a modulation current through the reference diode for driving a light-emitting device. A second current mirror sets a reference biasing current to maintain a constant bias of the reference diode. A first capacitor, charged by a differential amplifier and coupled to the reference diode, supplies complementary charge to the reference diode during differential input voltage transitions. Components of the driver circuit provide asymmetrical operation of the laser, allowing rapid light-emitting-device turn-on and turn-off.

US Patent:

6275114, Aug 14, 2001

Filed:

Jan 6, 2000

Appl. No.:

9/478593

Inventors:

Todd M. Tanji - Egan MN
John J. Stronczer - Mattawan MI

Assignee:

Applied Micro Circuits Corporation - San Diego CA

International Classification:

H03F 308
H01J 4014

US Classification:

330308

Abstract:

A transimpedance amplifier according to the present invention is designed for high-speed fiber optic communications. The transimpedance amplifier preferably includes an input stage, a second stage and a bias generator. The input stage is operably coupled to the second stage and has an input impedance. The second stage has an output impedance. The bias generator is operably coupled to the input stage and the second stage, and operates to bias the input stage and second stage such that the input impedance substantially matches the output impedance. In this manner, the input and output impedances of a transimpedance amplifier of a fiber optics communication receiver are controllable to a desired impedance for interfacing with a transmission line.