Chin P Chang

US Patent:

6597842, Jul 22, 2003

Filed:

May 21, 2001

Appl. No.:

09/862146

Inventors:

Jyl Ren Dent - Rolling Heights CA
Amado Cordova - Venice CA
Ronald J. Michal - Wrightwood CA
Chin L. Chang - Walnut CA
Trong-Huang Lee - Walnut CA

Assignee:

Copley Networks, Inc. - City of Industry CA

International Classification:

G02B 642

US Classification:

385 39, 385 24, 385 33, 385 42, 359124, 359127, 359131

Abstract:

An optical interleaver. The interleaver is based upon the Mach Zender interferometer. At least one of the optical paths joining opposed couplers of the arrangement includes an optical image transfer element intermediate the ends of fibers associated with the couplers. In one embodiment, the optical image transfer element is a single imaging lens whereas, in another embodiment, the element consists of an aligned pair of collimating lenses. During fabrication, optical positioning stages support the optical image transfer element and fiber ends to permit ready adjustment of , the optical path length difference between the arms of the interleaver, to assure predetermined optical channel spacing of an input DWDM signal.

US Patent:

7542820, Jun 2, 2009

Filed:

Sep 28, 2006

Appl. No.:

11/536582

Inventors:

Chung-Ho Huang - San Jose CA, US
Shih-Jeun Fan - San Jose CA, US
Chin Chuan Chang - Los Altos CA, US
Nicolas Bright - San Jose CA, US

Assignee:

Lam Research Corporation - Fremont CA

International Classification:

G06F 19/00

US Classification:

700104

Abstract:

A method for affecting a creation of a recipe for processing a substrate in a processing system. The method includes providing a best-known method driven recipe editor. The best-known method driven recipe editor incorporates best-known methods (BKMs), which are best practice specifications for the recipe. The method also includes creating a plurality of BKM modules based on the BKMs for the recipe. The method further includes defining rules for parameters in the plurality of BKM modules. The rules are propagated by the BKMs. The methods moreover includes creating a BKM driven recipe by employing the best-known method driven recipe editor to enter values for the parameters within the guidelines of BKM rules.

US Patent:

8427126, Apr 23, 2013

Filed:

Nov 30, 2009

Appl. No.:

12/627912

Inventors:

Hao Peng - Sunnyvale CA, US
Chin Chang - Agoura Hills CA, US

Assignee:

Semtech Corporation - Camarillo CA

International Classification:

G05F 1/575

US Classification:

323283, 323284

Abstract:

A system and method for controlling a digital pulse-width modulated power converter achieves a fast large-signal transient response while maintaining a slow response near the steady-state operating point in order to assure stability and to reduce the system's susceptibility to noise. Digital output error samples are processed through a gain scheduling block that applies a non-linear gain function to produce a weak loop response when the system is near its steady-state equilibrium point and a strong loop response when large transients are encountered. The resulting system maintains a fast transient response to large error signals while reducing noise and loop jittering and assuring loop stability.

US Patent:

20020181830, Dec 5, 2002

Filed:

May 21, 2001

Appl. No.:

09/861910

Inventors:

Jyh Dent - Rolling Heights CA, US
Amado Cordova - Venice CA, US
Ronald Michal - Wrightwood CA, US
Chin Chang - Walnut CA, US
Trong-Huang Lee - Walnut CA, US

International Classification:

G02B006/26

US Classification:

385/015000

Abstract:

A method for forming an all-fiber, low-loss interleaver to obtain a predetermined optical channel spacing. The interleaver features at least one arm formed with and continuous between couplers of a Mach Zender type arrangement. The interleaver is formed by first analytically determining , the difference in optical lengths between the two optical paths between the couplers. The difference is then fine-tuned by the application of heat and tension to a jacket-stripped segment of the continuous fiber arm as a DWDM signal is observed at the output of the interleaver.

US Patent:

20040120720, Jun 24, 2004

Filed:

Dec 24, 2002

Appl. No.:

10/329225

Inventors:

Chin Chang - Walnut CA, US
Amado Cordova - Venice CA, US

International Classification:

H04B010/00

US Classification:

398/139000, 398/135000

Abstract:

A fiber optic transceiver includes a VCSEL light source. The transceiver is adapted to communicate with existing LED-based transceivers to enable external electronic circuits to interact. The transceiver of the invention includes an InGaAs photodetector for receiving 1310 nm signals emitted from the LED light source of an existing transceiver. The existing transceiver typically includes an InGaAs photodetector characterized by distinct responsivities at 850 nm and at 1310 nm. This enables signals transmitted at 850 nm from the VCSEL light source of the transceiver to be detected by an existing LED-based transceiver, while the InGaAs photodetector of the transceiver of the invention is capable of receiving signals emitted from the LED light source.

US Patent:

20040184746, Sep 23, 2004

Filed:

Mar 17, 2003

Appl. No.:

10/388990

Inventors:

Chin Chang - Walnut CA, US
Chung-Chien Chen - Rowland Heights CA, US
Trong-Huang Lee - Walnut CA, US

International Classification:

G02B006/44

US Classification:

385/100000

Abstract:

Apparatus for extending the range of effective communication of high speed digital video data between remote devices, such as a microprocessor and a flat panel display, having associated DVI standard connectors. A fiber optic cable comprising a plurality of fibers provides optical paths for signal transmission between the DVI connectors. Electrooptic converters are provided for converting the electrical signals sent and received by each of the connectors to optical form for transmission over the optical fiber cable.

US Patent:

54427193, Aug 15, 1995

Filed:

Jul 21, 1993

Appl. No.:

8/095278

Inventors:

Chin L. Chang - West Covina CA
Albert Choi - Agoura Hills CA
Sheri L. Douglas - Newbury Park CA

Assignee:

Litton Systems, Inc., a Delaware corporation - Woodland Hills CA

International Classification:

G02B 610

US Classification:

385 3

Abstract:

Lithium niobate waveguides for light and lithium niobate channel waveguide electro-optic phase modulators for light include sufficient lithium ions such that, when an electrical signal of known value is applied to such waveguides and modulators, the phase of light passing through the waveguide or the modulator changes to a desired value within a time period that is substantially instantaneous.

US Patent:

59405546, Aug 17, 1999

Filed:

May 23, 1997

Appl. No.:

8/862762

Inventors:

Chin L. Chang - Walnut CA
Chao Yung Yeh - Rosemead CA
Michel K. Smith - Cerritos CA
Keyth M. Smith - Mission Hills CA
Ricardo A. Rosette - Oxnard CA
Robert Straede - Woodland Hills CA

Assignee:

Lightwave Link, Inc. - Burbank CA

International Classification:

G02B 626

US Classification:

385 22

Abstract:

A method for coupling light from an input optical fiber into a selected one of a plurality of output optical fibers includes the steps of forming the input optical fiber to include a length of beam expanded fiber, arranging the plurality of output optical fibers in an array and moving an end of the input optical fiber into alignment with a selected one of the plurality of output optical fibers.