Chee Peng Wong

US Patent:

7346251, Mar 18, 2008

Filed:

Apr 18, 2006

Appl. No.:

11/405732

Inventors:

Ranojoy Bose - Flushing NY, US
Chee Wei Wong - New York NY, US
Xiaodong Yang - New York NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

G02B 6/10

US Classification:

385129, 359332

Abstract:

Devices and methods of manufacturing; for emitting substantially white light using a photonic crystal are described. The photonic crystal has a lattice of air holes and is made from a substrate containing quantum dots. The substrate is etched with three defects that are optically coupled together so that each emits only certain frequencies of light. In combination, the defects can produce substantially white light. The parameters of the photonic crystal are dimensioned so as to cause the coupling between the defects to produce substantially white light.

US Patent:

7424181, Sep 9, 2008

Filed:

Jan 24, 2005

Appl. No.:

11/041350

Inventors:

Milos Popovic - Richmond Hill, CA
Michael R. Watts - Hingham MA, US
Chee Wei Wong - New York NY, US
Lionel C. Kimerling - Concord MA, US

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G02B 6/12

US Classification:

385 16, 385 15, 385 17

Abstract:

An optical device includes a first and a second splitting device. Each of the first and second splitting devices have respective first and second input ports, respective first and second output ports, and a respective transfer matrix. A first optical waveguide is optically coupled to the first output port of the first splitting device and the first input port of the second splitting device. A second optical waveguide is optically coupled to the second output port of the first splitting device and the second input port of the second splitting device. The first and second optical waveguides are configured to introduce a phase shift of π radians to the optical radiation propagating through the first optical waveguide with respect to the optical radiation propagating through the second optical waveguide. The transfer matrix of the second splitting device is the diagonal transpose of the transfer matrix of the first splitting device and the transfer matrix of the second splitting device is substantially different from the transfer matrix of the first splitting device.

US Patent:

7466878, Dec 16, 2008

Filed:

Feb 10, 2006

Appl. No.:

11/351725

Inventors:

Poh-Boon Phua - Singapore, SG
Chee Wei Wong - New York NY, US
Erich P. Ippen - Belmont MA, US

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G02B 6/00

US Classification:

385 11, 385 6, 385 8, 359251, 359281, 359283, 359301, 359302, 359303, 359304, 359352, 359483

Abstract:

A polarization controller includes a phase retarder having a rotation about an {1,0,0} axis that receives an optical signal from a waveguide structure. At least one nanoelectromechanical dielectric perturber produces 45 birefringent axes by placing the at least one nanoelectromechanical dielectric perturber at selective positions around the phase retarder to produce dynamic change in the effective index in one of the modes existent in an extraordinary axial direction.

US Patent:

7532656, May 12, 2009

Filed:

Feb 15, 2006

Appl. No.:

11/354725

Inventors:

Xiaodong Yang - New York NY, US
Chee Wei Wong - New York NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

H01S 3/083

US Classification:

372 94, 372 30, 372 66

Abstract:

Devices for generating a laser beam are disclosed. The devices include a silicon micro ring having at least one silicon optical waveguide disposed at a distance from the micro ring. The radius and the cross-sectional dimension of the microring, the cross-sectional dimension of the waveguide, and the distance between the micro ring and the waveguide are determined such that one or more pairs of whispering gallery mode resonant frequencies of the micro ring are separated by an optical phonon frequency of silicon. Methods of manufacturing a lasing device including a silicon micro ring coupled with a silicon waveguide are also disclosed.

US Patent:

7840099, Nov 23, 2010

Filed:

Jan 18, 2007

Appl. No.:

11/624357

Inventors:

Dong Pan - Andover MA, US
Jifeng Liu - Cambridge MA, US
Lionel C. Kimerling - Concord MA, US
James F. McMillan - New York NY, US
Michael D. Sockin - New York NY, US
Chee Wei Wong - New York NY, US

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G02F 1/01
G02F 1/295

US Classification:

385 1, 385 4, 385 9

Abstract:

An optical modulator structure includes at least two waveguide structures for inputting and outputting an optical signal. At least one ring resonator structure provides coupling between the at least two waveguide structures. The at least one ring resonator structure includes Ge or SiGe.

US Patent:

7840101, Nov 23, 2010

Filed:

Jan 3, 2007

Appl. No.:

12/160043

Inventors:

Chee Wei Wong - New York NY, US
Rohit Chatterjee - Chennai, IN
Xiaochun Li - Madison WI, US
Xugang Zhang - Milwaukee WI, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

G02B 6/00
G01N 21/00

US Classification:

385 12, 385 13, 3562438, 398 33, 398 82

Abstract:

Systems and methods for sensing properties of a workpiece and embedding a photonic sensor in metal are disclosed herein. In some embodiments, systems for sensing properties of a workpiece include an optical input, a photonic device, an optical detector, and a digital processing device. The optical input provides an optical signal at an output of the optical input. The photonic device is coupled to the workpiece and to the output of the optical input. The photonic device generates an output signal in response to the optical signal, wherein at least one of an intensity of the output signal and a wavelength of the output signal depends on at least one of thermal characteristics and mechanical characteristics of the workpiece. The optical detector receives the output signal from the photonic device and is configured to generate a corresponding electronic signal. The digital processing device is coupled to the optical detector and determines at least one of the thermal characteristics and mechanical the characteristics of the workpiece based on the electronic signal.

US Patent:

7869470, Jan 11, 2011

Filed:

Aug 31, 2006

Appl. No.:

12/065406

Inventors:

Chee Wei Wong - New York NY, US
James F. McMillan - New York NY, US
Xiaodong Yang - New York NY, US
Richard Osgood, Jr. - Chappaqua NY, US
Jerry Dadap - Red Bank NJ, US
Nicolae C. Panoiu - Barnet, GB

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

H01S 3/30

US Classification:

372 3

Abstract:

Devices and methods for providing stimulated Raman lasing are provided. In some embodiments, devices include a photonic crystal that includes a layer of silicon having a lattice of holes and a linear defect that forms a waveguide configured to receive pump light and output Stokes light through Raman scattering, wherein the thickness of the layer of silicon, the spacing of the lattice of holes, and the size of the holes are dimensioned to provide Raman lasing. In some embodiments, methods include forming a layer of silicon, and etching the layer of silicon to form a lattice of holes with a linear defect that forms a waveguide configured to receive pump light and output Stokes light through Raman scattering, wherein the thickness of the layer of silicon, the spacing of the lattice of holes, and the size of the holes are dimensioned to provide Raman lasing.

US Patent:

8017419, Sep 13, 2011

Filed:

Feb 25, 2009

Appl. No.:

12/392634

Inventors:

Xiaodong Yang - New York NY, US
Chee Wei Wong - New York NY, US

Assignee:

The Trustees of Columbia University in the City of New York - New York NY

International Classification:

H01L 21/00
H01S 3/083

US Classification:

438 31, 438 29, 438 32, 372 94

Abstract:

Methods of manufacturing a lasing device are provided by some embodiments, the methods including: creating a silicon micro ring with a predetermined radius and a predetermined first cross-sectional dimension; creating a silicon waveguide with a predetermined second cross-sectional dimension, the silicon waveguide spaced from the silicon micro ring by a predetermined distance; and wherein the predetermined distance, the predetermined radius, the predetermined first cross-sectional dimension, and the predetermined second cross-sectional dimension are determined so that at least one first whispering gallery mode resonant frequency of the silicon micro ring and at least one second whispering gallery mode resonant frequency of the silicon micro ring are separated by an optical phonon frequency of silicon.