Jim Z Huang

US Patent:

20190190610, Jun 20, 2019

Filed:

Feb 14, 2019

Appl. No.:

16/275727

Inventors:

- Houston TX, US
Jim Huang - Palo Alto CA, US
Ashkan Seyedi - Palo Alto CA, US
Marco Fiorentino - Mountain View CA, US
Raymond G. Beausoleil - Seattle WA, US

International Classification:

H04B 10/50
G02F 1/01
G02F 1/225

Abstract:

One example includes a bias-based Mach-Zehnder modulation (MZM) system. The system includes a Mach-Zehnder modulator to receive and split an optical input signal and to provide an intensity-modulated optical output signal based on a high-frequency data signal to modulate a relative phase of the split optical input signal to transmit data and based on a bias voltage to modulate the relative phase of the split optical input signal to tune the Mach-Zehnder modulator. The system also includes a bias feedback controller to compare a detection voltage associated with the intensity-modulated output signal with a reference voltage to measure an extinction ratio associated with an optical power of the intensity-modulated optical output signal and to adjust the bias voltage based on the comparison to substantially maximize the extinction ratio.

US Patent:

20180109322, Apr 19, 2018

Filed:

May 27, 2015

Appl. No.:

15/566929

Inventors:

- Houston TX, US
Jim Huang - Palo Alto CA, US
Ashkan Seyedi - Palo Alto CA, US
Marco Fiorentino - Palo Alto CA, US
Raymond G Beausoleil - Palo Alto CA, US

International Classification:

H04B 10/50
G02F 1/01

Abstract:

One example includes a bias-based Mach-Zehnder modulation (MZM) system. The system includes a Mach-Zehnder modulator to receive and split an optical input signal and to provide an intensity-modulated optical output signal based on a high-frequency data signal to modulate a relative phase of the split optical input signal to transmit data and based on a bias voltage to modulate the relative phase of the split optical input signal to tune the Mach-Zehnder modulator. The system also includes a bias feedback controller to compare a detection voltage associated with the intensity-modulated output signal with a reference voltage to measure an extinction ratio associated with an optical power of the intensity-modulated optical output signal and to adjust the bias voltage based on the comparison to substantially maximize the extinction ratio.

US Patent:

20160363952, Dec 15, 2016

Filed:

Jun 11, 2015

Appl. No.:

14/736908

Inventors:

- Cupertino CA, US
Nicholas J. Kunst - San Francisco CA, US
Jim Z. Huang - San Jose CA, US

International Classification:

G05F 5/00
H02J 7/00

Abstract:

A series pass circuit conducts a pass current between a first side and a second side. A power source is coupled to the first side, while a capacitor is coupled to the second side. A system component whose power supply input is coupled to the capacitor may exhibit pulse-type activity. A control circuit increases the resistance to the pass current, in the series pass circuit, in accordance with a reporting signal that indicates whenever the system component is more active or less active. Other embodiments are also described and claimed.

US Patent:

20140253150, Sep 11, 2014

Filed:

Mar 6, 2013

Appl. No.:

13/787669

Inventors:

- Cupertino CA, US
Kevin M. Keeler - Los Gatos CA, US
Jim Z. Huang - Sunnyvale CA, US
Parviz Mishkanian - San Jose CA, US

Assignee:

Apple Inc. - Cupertino CA

International Classification:

G01R 27/26
G01R 27/02

US Classification:

324664, 324694

Abstract:

Electronic devices may be accidentally exposed to liquid during operation. To detect liquid intrusion events, an electronic device may be provided with one or more electronic liquid contact sensors. The liquid contact sensors may have electrodes. Control circuitry may make measurements across the electrodes such as resistance and capacitance measurements to detect the presence of liquid. Liquid contact sensor data may be maintained in a log within storage in the electronic device. The liquid contact sensor data can be used to display information for a user of the electronic device or can be loaded onto external equipment for analysis. Liquid contact sensor electrodes may be formed from metal traces on substrates such as printed circuits, from contacts in a connector, from contacts on an integrated circuit, or from other conductive electrode structures.