Chin Cheng Chang

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.

US Patent:

51931362, Mar 9, 1993

Filed:

Nov 26, 1991

Appl. No.:

7/799716

Inventors:

Chin L. Chang - West Covina CA
Daniel A. Niebauer - Woodland Hills CA
Albert Choi - Woodland Hills CA

Assignee:

Litton Systems, Inc. - Woodland Hills CA

International Classification:

G02B 610

US Classification:

385129

Abstract:

Methods for making proton-exchanged, multi-function integrated optics chips, preferably chips based on the stable, rhombohedral lithium niobate structure, and having substantially diffused protons, while being substantially free of microcracking and of internal stresses that can result in microcracking, and yet having optimally high electro-optic coefficients, include the steps of: forming a multi-function integrated optics chip substrate from a substrate such as lithium niobate; affixing a removable mask or mask pattern to at least one surface of the chip to form one or more proton-exchanged patterns of desired size and shape at the surface of the chip; treating the masked chip with a proton-exchanging acid such as benzoic acid at a temperature and for a time sufficient to cause substantial proton exchange at and below the unmasked surface of the chip, but for a time insufficient to create any microcracking or internal stresses that lead to microcracking in the chip; removing the mask or mask pattern from the chip; and thermally annealing the chip, in an oxygen-containing environment, at a temperature and for a time sufficient to diffuse the hydrogen ions at and near the surface of the chip substantially below its surface, at a temperature and for a time sufficient to optimize the polarization extinction ratio of the chip, and for a time and at a temperature sufficient to restore and to optimize the electro-optic coefficient and to reduce light and propagation losses in the chip.

US Patent:

60441860, Mar 28, 2000

Filed:

May 28, 1998

Appl. No.:

9/086784

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 - Burbank CA

International Classification:

G02B 626

US Classification:

385 23

Abstract:

A fiber optic switching apparatus includes a first fiber alignment head having a V-groove formed therein. A first optical fiber is mounted in the V-groove with an end of the first optical fiber being arranged to be spaced apart from an end of the V-groove. A second fiber alignment head is arranged to be adjacent the first fiber alignment head. The second fiber alignment head includes a switching member arranged to be pivotable between a first position and a second position. A second optical fiber is connected to the switching member with the second optical fiber being arranged to have an end extending into the V-groove such that the ends of the first and second optical fibers are in longitudinal alignment when the switching member is in its first position and being out of alignment when the switching member is in its second position. The second optical fiber preferably is arranged such that when the switching member is in the first position, a portion of the second optical fiber is bent so that elastic forces in the first optical fiber retain it in the first position in the V-groove.

US Patent:

50076957, Apr 16, 1991

Filed:

Sep 29, 1989

Appl. No.:

7/415014

Inventors:

Chin L. Chang - West Covina CA

Assignee:

Honeywell Inc. - Minneapolis MN

International Classification:

G02B 600
G02F 129

US Classification:

350 9614

Abstract:

A cladded optical fiber is secured in a slot in a substrate which is ground and polished to access the evanescent field. A thin electro-optically active layer of PLZT is deposited on the top of the fiber substrate. A pair of parallel electrodes is then deposited on top of the crystal PLZT film. An electric field distribution parallel to the electro-optical film is generated at the center of the electrode gap by applying a voltage to the electrode pair so as to effect a phase shift of the light wave propagating in the fiber.