Tong Shan Chen

US Patent:

20120320448, Dec 20, 2012

Filed:

Jun 15, 2012

Appl. No.:

13/525189

Inventors:

Jiang LI - Pasadena CA, US
Tong CHEN - Pasadena CA, US
Kerry VAHALA - Pasadena CA, US

International Classification:

G02F 2/02
C03C 25/68
C03C 25/22

US Classification:

359332, 65414

Abstract:

A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.

US Patent:

20120321245, Dec 20, 2012

Filed:

Jun 12, 2012

Appl. No.:

13/494707

Inventors:

Kerry VAHALA - PASADENA CA, US
Tong CHEN - PASADENA CA, US
Jiang LI - PASADENA CA, US

International Classification:

G02B 6/125
G02B 6/136
H01L 21/02
G02B 6/10

US Classification:

385 14, 385130, 438 31, 257E21002

Abstract:

A method of manufacturing a waveguide eliminates a prior art reflow step and introduces certain new steps that permit fabricating of an ultra-low loss waveguide element on a silicon chip. The ultra-low loss waveguide element may be adapted to fabricate a number of devices, including a wedge resonator and a ultra-low loss optical delay line having an extended waveguide length.

US Patent:

20160267188, Sep 15, 2016

Filed:

Mar 12, 2015

Appl. No.:

14/656053

Inventors:

- REDWOOD SHORES CA, US
YASIN CENGIZ - IRVINE CA, US
ELIZABETH LINGG - PLEASANTON CA, US
TONG CHEN - REDWOOD CITY CA, US

Assignee:

ORACLE INTERNATIONAL CORPORATION - REDWOOD SHORES CA

International Classification:

G06F 17/30

Abstract:

Embodiments of the present invention allow a system to use data gathered from social networks and other systems to determine an ordered list of desired topics or skills to define a subject matter area and incorporate the order of the topics or skills into a search. To define this subject matter area, embodiments can consider not just the topics or skills that are listed, but those topics or skills that are similar based on a pre-computed topic graph. These considerations can be incorporated into a generated query, so that the query itself accounts for similarity of topics via the topic graph and the order of desired terms. The query generation process can include a claimed skills veracity model that provides differential weighting to claimed skills, based on the skill-sets of users who are deemed to be similar to the user being evaluated.

US Patent:

20160190769, Jun 30, 2016

Filed:

Feb 8, 2016

Appl. No.:

15/018824

Inventors:

- PASADENA CA, US
Tong CHEN - PASADENA CA, US
Kerry VAHALA - PASADENA CA, US

International Classification:

H01S 5/227
H01S 3/17
H01S 3/0941
H01S 5/10
H01S 3/30
H01S 3/094

Abstract:

A highly-coherent chip-based laser generating system includes a disk resonator incorporating a wedge structure fabricated from a silicon dioxide layer of a chip. The disk resonator is operable to generate a highly-coherent laser from a low-coherence optical pump input provided at an optical power level as low as 60 μW. The disk resonator is fabricated with sub-micron cavity size control that allows generation of a highly-coherent laser using a controllable Stimulated Brillouin Scattering process that includes matching of a cavity free-spectral-range to a Brillouin shift frequency in silica. While providing several advantages due to fabrication on a chip, the highly-coherent laser produced by the disk resonator may feature a Schawlow-Townes noise level as low as 0.06 Hz/Hz (measured with the coherent laser at a power level of about 400 μW) and a technical noise that is at least 30 dB lower than the low-coherence optical pump input.

US Patent:

20150092808, Apr 2, 2015

Filed:

Jun 15, 2012

Appl. No.:

13/525147

Inventors:

Jiang LI - PASADENA CA, US
Tong CHEN - PASADENA CA, US
Kerry VAHALA - PASADENA CA, US

International Classification:

H01S 5/10
H01S 5/227

US Classification:

372 95, 438 31

Abstract:

A highly-coherent chip-based laser generating system includes a disk resonator incorporating a wedge structure fabricated from a silicon dioxide layer of a chip. The disk resonator is operable to generate a highly-coherent laser from a low-coherence optical pump input provided at an optical power level as low as 60 μW. The disk resonator is fabricated with sub-micron cavity size control that allows generation of a highly-coherent laser using a controllable Stimulated Brillouin Scattering process that includes matching of a cavity free-spectral-range to a Brillouin shift frequency in silica. While providing several advantages due to fabrication on a chip, the highly-coherent laser produced by the disk resonator may feature a Schawlow-Townes noise level as low as 0.06 Hz/Hz (measured with the coherent laser at a power level of about 400 μW) and a technical noise that is at least 30 dB lower than the low-coherence optical pump input.

US Patent:

20150029579, Jan 29, 2015

Filed:

Oct 13, 2014

Appl. No.:

14/513058

Inventors:

- Pasadena CA, US
Tong CHEN - PASADENA CA, US
Kerry VAHALA - PASADENA CA, US

International Classification:

G02F 1/35

US Classification:

359332

Abstract:

A frequency comb generator fabricated on a chip with elimination of a disadvantageous reflow process, includes an ultra-high Q disk resonator having a waveguide that is a part of a wedge structure fabricated from a silicon dioxide layer of the chip. The disk resonator allows generation of a frequency comb with a mode spacing as low as 2.6 GHz and up to 220 GHz. A surface-loss-limited behavior of the disk resonator decouples a strong dependence of pumping threshold on repetition rate.

US Patent:

20140105232, Apr 17, 2014

Filed:

Mar 15, 2013

Appl. No.:

13/831692

Inventors:

California Institute of Technology - , US
Tong Chen - Pasadena CA, US

International Classification:

H01S 3/00
H01S 3/13
H01S 3/08

US Classification:

372 9, 3593411, 3593414

Abstract:

An optical apparatus comprises a waveguide substrate and an optical reference cavity. The optical reference cavity comprises an optical waveguide formed on the waveguide substrate and arranged to form a closed loop greater than or about equal to 10 cm in length. The RMS resonance frequency fluctuation is less than or about equal to 100 Hz. The Q-factor can be greater than or about equal to 10. The optical waveguide can exhibit optical loss less than or about equal to 0.2 dB/m for propagation of an optical signal along the optical waveguide. The closed loop path can comprise two or more linked spirals greater than or about equal to 1 meter in length and can occupy an area on the waveguide substrate less than or about equal to 5 cm.