Daniel Kucharski

US Patent:

7215194, May 8, 2007

Filed:

May 28, 2004

Appl. No.:

10/857582

Inventors:

Daniel Kucharski - Ithaca NY, US
Kevin Kornegay - Ithaca NY, US

Assignee:

Cornell Research Foundation, Inc. - Ithaca NY

International Classification:

H03F 3/45

US Classification:

330252, 330253, 330260

Abstract:

Circuit topologies that provide extended bandwidth of operation are disclosed. The circuits have two stages that share inductors, in which in-phase current components sum at a summing node and flow together, increasing the magnitude of the current in the inductors. The inductive peaking exhibited by the circuits is increased without using excessively large inductors.

US Patent:

7450787, Nov 11, 2008

Filed:

Feb 27, 2006

Appl. No.:

11/363512

Inventors:

Daniel Kucharski - Carlsbad CA, US
Behnam Analui - Del Mar CA, US
Roger Koumans - Irvine CA, US
Thierry Pinguet - Cardiff by the Sea CA, US
Thiruvikraman Sadagopan - Carlsbad CA, US

Assignee:

Luxtera, Inc. - Carlsbad CA

International Classification:

G02F 1/035

US Classification:

385 2, 385 3

Abstract:

High speed optical modulators can be made of k modulators connected in series disposed on one of a variety of semiconductor substrates. An electrical signal propagating in a microwave transmission line is tapped off of the transmission line at regular intervals and is amplified by k distributed amplifiers. Each of the outputs of the k distributed amplifiers is connected to a respective one of the k modulators. Distributed amplifier modulators can have much higher modulating speeds than a comparable lumped element modulator, due to the lower capacitance of each of the k modulators. Distributed amplifier modulators can have much higher modulating speeds than a comparable traveling wave modulator, due to the impedance matching provided by the distributed amplifiers.

US Patent:

7515775, Apr 7, 2009

Filed:

Sep 29, 2006

Appl. No.:

11/540172

Inventors:

Daniel Kucharski - Carlsbad CA, US
Behnam Analui - Del Mar CA, US
Roger Koumans - Irvine CA, US
Thierry Pinguet - Cardiff by the Sea CA, US
Thiruvikraman Sadagopan - Carlsbad CA, US

Assignee:

Luxtera, Inc. - Carlsbad CA

International Classification:

G02F 1/01

US Classification:

385 1, 385 2, 385 3

Abstract:

Various embodiments described herein comprises an optoelectronic device comprising a waveguide structure including a plurality of optical modulator elements each having an optical property that is adjustable upon application of an electrical signal so as to modulate light guided in the waveguide structure. The optoelectronic device also comprises a plurality of amplifiers in distributed fashion. Each amplifier is electrically coupled to one of the optical modulators to apply electrical signals to the optical modulator.

US Patent:

7899276, Mar 1, 2011

Filed:

Jan 12, 2009

Appl. No.:

12/352415

Inventors:

Daniel Kucharski - Carlsbad CA, US
Behnam Analui - Del Mar CA, US
Roger Koumans - Irvine CA, US
Thierry Pinguet - Cardiff by the Sea CA, US
Thiruvikraman Sadagopan - Carlsbad CA, US

Assignee:

Luxtera, Inc. - Carlsbad CA

International Classification:

G02F 1/025
G02F 1/225
G02B 6/12

US Classification:

385 2, 385 3, 385 14, 385 32

Abstract:

Various embodiments described herein comprises an optoelectronic device comprising a waveguide structure including a plurality of optical modulator elements each having an optical property that is adjustable upon application of an electrical signal so as to modulate light guided in the waveguide structure. The optoelectronic device also comprises a plurality of amplifiers in distributed fashion. Each amplifier is electrically coupled to one of the optical modulators to apply electrical signals to the optical modulator.

US Patent:

8238014, Aug 7, 2012

Filed:

Sep 8, 2009

Appl. No.:

12/555291

Inventors:

Daniel Kucharski - Carlsbad CA, US
Brian Welch - San Diego CA, US
Sherif Abdalla - Carlsbad CA, US

Assignee:

Luxtera Inc. - Carlsbad CA

International Classification:

G02B 26/00
G02F 1/01
G02F 1/03
G02F 1/07

US Classification:

359238, 359245, 359279, 359290

Abstract:

Methods and systems for encoding multi-level pulse amplitude modulated signals using integrated optoelectronics are disclosed and may include generating a multi-level, amplitude-modulated optical signal utilizing an optical modulator driven by two or more electrical input signals. The optical modulator may include optical modulator elements coupled in series and configured into groups. The number of optical modular elements and groups may configure the number of levels in the multi-level amplitude modulated optical signal. Unit drivers may be coupled to each of the groups. The electrical input signals may be synchronized before communicating them to the unit drivers utilizing flip-flops. Phase addition may be synchronized utilizing one or more electrical delay lines. The optical modulator may be integrated on a single substrate, which may include one of: silicon, gallium arsenide, germanium, indium gallium arsenide, polymers, or indium phosphide. The optical modulator may include a Mach-Zehnder interferometer or one or more ring modulators.

US Patent:

8289067, Oct 16, 2012

Filed:

Sep 13, 2010

Appl. No.:

12/880908

Inventors:

Daniel Kucharski - Carlsbad CA, US

Assignee:

Luxtera Inc. - Carlsbad CA

International Classification:

H03K 17/687

US Classification:

327427, 327372, 327359

Abstract:

A method and system for bandwidth enhancement using hybrid inductors are disclosed and may include providing an electrical impedance that increases with frequency via hybrid inductors comprising a transistor, a capacitor, an inductor, and a resistor. A first terminal of the hybrid inductors may comprise a first terminal of the transistor. A second terminal of the transistor may be coupled to a first terminal of the resistor and a first terminal of the capacitor. A second terminal of the resistor may comprise a second terminal of the hybrid inductors. A third terminal of the transistor may be coupled to a first terminal of an inductor, and a second terminal of the inductor may be coupled to a second terminal of the capacitor. The hybrid inductors may be configured by varying transconductance, resistance, and/or capacitance and may be utilized as an amplifier load.

US Patent:

8358940, Jan 22, 2013

Filed:

Jul 6, 2010

Appl. No.:

12/830917

Inventors:

Daniel Kucharski - San Marcos CA, US

Assignee:

Luxtera Inc. - Carlsbad CA

International Classification:

H04B 10/06

US Classification:

398209, 375345, 4551273, 4552532

Abstract:

A method and system for optoelectronic receivers for uncoded data are disclosed and may include amplifying received electrical signals in a signal amplifier comprising differential gain stages with signal detectors coupled to the outputs. First and second output voltages may be tracked and held utilizing the signal detectors. A difference between the tracked and held value may be amplified in a feedback path of the gain stage, which enables the dynamic configuration of a decision level. The received electrical signals may be generated from an optical signal by a PIN detector, an avalanche photodiode, or a phototransistor. The electrical signal may be received from a read channel. The feedback path may comprise digital circuitry, including an A/D converter, a state machine, and a D/A converter. The detectors may comprise envelope detectors utilized to detect maximum or minimum voltages. The signal amplifier may be integrated in a photonically-enabled CMOS chip.

US Patent:

8604866, Dec 10, 2013

Filed:

Oct 16, 2012

Appl. No.:

13/653041

Inventors:

Daniel Kucharski - San Diego CA, US

Assignee:

Luxtera, Inc. - Carlsbad CA

International Classification:

H03K 17/687

US Classification:

327427, 327372, 327359

Abstract:

A method and system for bandwidth enhancement using hybrid inductors are disclosed and may include a complementary metal oxide semiconductor (CMOS) transceiver providing an electrical impedance that increases with frequency via hybrid inductors comprising a transistor, a capacitor, an inductor, and a resistor. A first terminal of the hybrid inductors may comprise a first terminal of the transistor. A second terminal of the transistor may be coupled to a first terminal of the resistor and a first terminal of the capacitor. A second terminal of the resistor may comprise a second terminal of the hybrid inductors. A third terminal of the transistor may be coupled to a first terminal of an inductor, and a second terminal of the inductor may be coupled to a second terminal of the capacitor. The hybrid inductors may be configured by varying transconductance, resistance, and/or capacitance and may be utilized as an amplifier load.