Chia Chien Chang

US Patent:

6580855, Jun 17, 2003

Filed:

Oct 10, 2000

Appl. No.:

09/684816

Inventors:

Sandeep T. Vohra - Fairfax Station VA
Chia Chen Chang - Rockville MD
Bryan Althouse - Annapolis MD

Assignee:

The United States of America as represented by the Secretary of the Navy - Washington DC

International Classification:

G02B 634

US Classification:

385 37

Abstract:

A bandwidth tunable fiber Bragg grating (FBG) device performs tuning in an optical transmission circuit by placing a grating in a compliant material, which is transversely loaded to create longitudinal strain through the Poisson effect of materials. Careful application of various load magnitudes along the length of the grating through the compliant material creates a strain gradient along the length of the grating, which chirps the grating thus resulting in altering the bandwidth of the grating. Tuning the grating bandwidth results, effectively, in tuning the dispersion of light being reflected off the grating. Insertion of such a device in the optical link allows for dynamic dispersion compensation in the link. The ability of the device to âdial-inâ a desired amount of dispersion is what makes it valuable.

US Patent:

20010009003, Jul 19, 2001

Filed:

Feb 5, 2001

Appl. No.:

09/775469

Inventors:

Robert Groat - Valley Lee MD, US
Evan Burfield - Vienna VA, US
Chia Chang - McLean VA, US
Mark Drissel - Columbia MD, US
Matthew Eichler - Arlington VA, US
Richard Garret - Fairfax VA, US
Neil Kipp - Fairfax VA, US
Perry Russell - Lexington Park MD, US

International Classification:

G06F017/60

US Classification:

705/036000

Abstract:

A method implemented in a computer system for dynamically analyzing the status of a numeric system wherein the numeric system which includes one or more numeric objects such as inflow objects, outflow objects, account objects, variable objects, and pipe objects. The present invention also provides numeric objects having a growth property. In addition, the present invention provides single icons which represent either a row or column of a spreadsheet.

US Patent:

20010009004, Jul 19, 2001

Filed:

Feb 5, 2001

Appl. No.:

09/775506

Inventors:

Robert Groat - Valley Lee MD, US
Evan Burfield - Vienna VA, US
Chia Chang - McLean VA, US
Mark Drissel - Columbia MD, US
Matthew Eichler - Arlington VA, US
Richard Garrett - Fairfax VA, US
Neill Kipp - Fairfax VA, US
Perry Rapp - Lexington Park MD, US

International Classification:

G06F017/60

US Classification:

705/036000

Abstract:

A method implemented in a computer system for dynamically analyzing the status of a numeric system wherein the numeric system which includes one or more numeric objects such as inflow objects, outflow objects, account objects, variable objects, and pipe objects. The present invention also provides numeric objects having a growth property. In addition, the present invention provides single icons which represent either a row or column of a spreadsheet.

US Patent:

20010032155, Oct 18, 2001

Filed:

Feb 5, 2001

Appl. No.:

09/775468

Inventors:

Robert Groat - Valley Lee MD, US
Evan Burfield - Vienna VA, US
Chia Chang - McLean VA, US
Mark Drissel - Columbia MD, US
Matthew Eichler - Arlington VA, US
Richard Garrett - Fairfax VA, US
Neill Kipp - Fairfax VA, US
Perry Rapp - Lexington Park MD, US

International Classification:

G06F017/60

US Classification:

705/035000, 705/036000, 705/030000, 705/033000

Abstract:

A method implemented in a computer system for dynamically analyzing the status of a numeric system wherein the numeric system which includes one or more numeric objects such as inflow objects, outflow objects, account objects, variable objects, and pipe objects. The present invention also provides numeric objects having a growth property. In addition, the present invention provides single icons which represent either a row or column of a spreadsheet.

US Patent:

20010032160, Oct 18, 2001

Filed:

Feb 5, 2001

Appl. No.:

09/775507

Inventors:

Robert Groat - Valley Lee MD, US
Evan Burfield - Fairfax VA, US
Chia Chang - McLean VA, US
Mark Drissel - Columbia MD, US
Matthew Eichler - Arlington VA, US
Richard Garrett - Fairfax VA, US
Neill Kipp - Blacksburg VA, US
Perry Rapp - Lexington Park MD, US

International Classification:

G06F017/60

US Classification:

705/036000, 705/035000, 705/030000

Abstract:

A method implemented in a computer system for dynamically analyzing the status of a numeric system wherein the numeric system which includes one or more numeric objects such as inflow objects, outflow objects, account objects, variable objects, and pipe objects. The present invention also provides numeric objects having a growth property. In addition, the present invention provides single icons which represent either a row or column of a spreadsheet.

US Patent:

20110292371, Dec 1, 2011

Filed:

May 26, 2011

Appl. No.:

13/116621

Inventors:

Chia Chen CHANG - Gaithersburg MD, US

Assignee:

Optical Air Data Systems, LLC - Manassas VA

International Classification:

G01C 3/08
G01P 3/36

US Classification:

356 501, 356 28

Abstract:

Systems and methods are disclosed for measuring a distance, a velocity, etc., of a target using coherent laser radiation. In one example, a method is provided comprising measuring a time required for a light pulse to travel to and from a target, the light pulse reflecting from the target, and determining the distance to the target based on the measuring. The method also comprises measuring a Doppler shift of the reflected light pulse using an optical detection technique and determining the velocity of the target from the Doppler shift. In a further example, a system is disclosed comprising a transceiver, a coherent source, an optical system and a detector configured to measure the distance to the target based on a measured time for a light pulse to travel to and from the target. The system is also configured to determine the velocity of the target from a measured Doppler shift.

US Patent:

20130083389, Apr 4, 2013

Filed:

Sep 27, 2012

Appl. No.:

13/628704

Inventors:

Optical Air Data Systems, L.L.C. - Manassas VA, US
Priyavadan Mamidipudi - Great Falls VA, US
Lance LeClair - Manassas VA, US
Rupak Changkakoti - Haymarket VA, US
Chia Chen Chang - Gaithersburg MD, US
Daniel Dakin - Great Falls VA, US

Assignee:

Optical Air Data Systems, L.L.C. - Manassas VA

International Classification:

H01S 3/067
G02F 1/11
G02F 1/01

US Classification:

359285, 3593411, 359240

Abstract:

A photonic integrated circuit and related method are presented. A photonic integrated circuit comprises a source of radiation, one or more optical amplifiers, a transceiver, and optical waveguides. The optical waveguides couple light between the source of radiation, the one or more optical amplifiers, and the transceiver. The one or more optical amplifiers are configured to increase an optical power of the light up to at least 10 mW. The photonic integrated circuit may be used to perform laser Doppler velocimeter type measurements.

US Patent:

20130179758, Jul 11, 2013

Filed:

Jan 11, 2012

Appl. No.:

13/348447

Inventors:

Guorjuh Thomas Hwang - Sugar Land TX, US
Chia Jen Chang - Sugar Land TX, US

International Classification:

H03M 13/09
G06F 11/10

US Classification:

714801, 714E11032

Abstract:

Circuits, integrated circuits, and methods are disclosed for interleaved parity computation. In one such example circuit, an interleaved parity computation circuit includes a first parity circuit that receives a first set of bits and a second parity circuit that receives a second set of bits. The first set of bits includes a first parity bit, and is received in the first parity circuit during a first clock cycle. The first parity circuit generates a first signal indicative of the parity of the first set of bits. The second set of bits includes a second parity bit, and is received in the second parity circuit during a second clock cycle. The second parity circuit generates a second signal indicative of the parity of the second set of bits. A combining circuit combines the first signal and the second signal into an alert signal.