Yuan Li

US Patent:

6351581, Feb 26, 2002

Filed:

Mar 17, 1998

Appl. No.:

09/040477

Inventors:

Christopher Richard Doerr - Middletown NJ
Yuan P. Li - Duluth GA

Assignee:

Agere Systems Optoelectronics Guardian Corp. - Orlando FL

International Classification:

G02B 626

US Classification:

385 24, 359124

Abstract:

An optical add-drop multiplexer (ADM) avoids waveguide crossings by being constructed in the form of a Mach-Zehnder interferometer having a demultiplexer/multiplexer (demux/mux) pair in each of its arms. Each demux/mux pair is interconnected by coherent connecting paths having heating elements for increasing the path length of selected connecting paths. Waveguide optical couplers having asymmetric transfer functions are used at the input and output of the ADM. These couplers cooperate with the activated heating elements to add and/or delete a selected optical channel to/from an optical transmission path. Each coherent connecting path includes a number of waveguides. The end-to-end transmission characteristic of the ADM through each individual waveguide has a Gaussian shape. These Gaussian shapes are designed intersect at their -3 dB wavelengths so that the end-to-end transmission characteristic of the ADM is flat.

US Patent:

8536777, Sep 17, 2013

Filed:

Aug 29, 2012

Appl. No.:

13/597739

Inventors:

Yuan Qiang Li - Plainsboro NJ, US
Michael D. Romanelli - North Plainfield NJ, US
Yongchi Tian - Princeton Junction NJ, US

Assignee:

Lightscape Materials, Inc. - Princeton NJ

International Classification:

H01J 1/63
C09K 11/79
C09K 11/65

US Classification:

313503, 2523014 F, 2523016 F

Abstract:

A red phosphor is provided. Also provided is a lighting apparatus containing a red phosphor.

US Patent:

20140015400, Jan 16, 2014

Filed:

Jul 13, 2012

Appl. No.:

13/548492

Inventors:

Yuan Qiang Li - Plainsboro NJ, US
Michael D. Romanelli - North Plainfield NJ, US
Yongchi Tian - Princeton Junction NJ, US

Assignee:

Rohm and Haas Electronic Materials LLC - Marlborough MA

International Classification:

C09K 11/77

US Classification:

313503, 2523014 F

Abstract:

A red phosphor is provided. Also provided is a lighting apparatus containing a red phosphor.

US Patent:

20140062287, Mar 6, 2014

Filed:

Aug 29, 2012

Appl. No.:

13/597633

Inventors:

Yuan Qiang Li - Plainsboro NJ, US
Michael D. Romanelli - North Plainfield NJ, US
Yongchi Tian - Princeton Junction NJ, US

Assignee:

LIGHTSCAPE MATERIALS, INC. - Princeton NJ

International Classification:

C09K 11/77
H05B 33/12

US Classification:

313503, 2523014 F

Abstract:

A red phosphor is provided. Also provided is a lighting apparatus containing a red phosphor.

US Patent:

20140062288, Mar 6, 2014

Filed:

Aug 31, 2012

Appl. No.:

13/601489

Inventors:

Yuan Qiang Li - Plainsboro NJ, US
Michael D. Romanelli - North Plainfield NJ, US
Yongchi Tian - Princeton Junction NJ, US

Assignee:

LIGHTSCAPE MATERIALS, INC. - Princeton NJ

International Classification:

C09K 11/77
H05B 33/12

US Classification:

313503, 2523014 F

Abstract:

A red phosphor is provided. Also provided is a lighting apparatus containing a red phosphor.

US Patent:

55966616, Jan 21, 1997

Filed:

Dec 28, 1994

Appl. No.:

8/365618

Inventors:

Charles H. Henry - Skillman NJ
Edward J. Laskowski - Scotch Plains NJ
Yuan P. Li - Alpharetta GA
Cecilia Y. Mak - Bedminster NJ
Henry H. Yaffe - Dunwoody GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

C02B 628

US Classification:

385 24

Abstract:

In accordance with the invention, a new type of monolithic optical waveguide filter comprises a chain of optical couplers of different effective lengths linked by differential delays of different lengths. The transfer of the chain of couplers and delays is the sum of contributions from all possible optical paths, each contribution forming a term in a Fourier series whose sum forms the optical output. A desired frequency response is obtained by optimizing the lengths of the couplers and the delay paths so that the Fourier series best approximates the desired response. The filter is advantageously optimized so that it is insensitive to uncontrolled fabrication errors and is short in length. The wavelength dependence of practical waveguide properties is advantageously incorporated in the optimization. Consequently, the filter is highly manufacturable by mass production.

US Patent:

57199760, Feb 17, 1998

Filed:

Oct 24, 1995

Appl. No.:

8/547767

Inventors:

Charles Howard Henry - Skillman NJ
Edward John Laskowski - Scotch Plains NJ
Yuan P. Li - Duluth GA
Henry Howard Yaffe - Dunwoody GA

Assignee:

Lucent Technologies, Inc. - Murray Hill NJ

International Classification:

G02B 626

US Classification:

385 50

Abstract:

An optimized waveguide structure enables the functional integration of various passive optic components on a single substrate. The optimized waveguide structure is characterized by a thicker core layer than used for square core waveguides and a core width that changes according to different functional regions of the optic circuit within which it is incorporated. The height (H) of the waveguide core is determined by the thickness of the core layer defined during the fabrication process and is ideally uniform across the circuit. The width (W) of the core, however, is changed between functional regions by the photo-lithographic mask and the chemical etching during the fabrication process. By way of example, an optimized waveguide structure for a P-doped silica planar waveguide with a. DELTA. approximately 0.

US Patent:

56299990, May 13, 1997

Filed:

Mar 10, 1995

Appl. No.:

8/401545

Inventors:

Charles H. Henry - Skillman NJ
Edward J. Laskowski - Scotch Plains NJ
Yuan P. Li - Scotch Plains NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 626

US Classification:

385 43

Abstract:

The present invention relates to a waveguide taper. The waveguide taper has a first end and a second end for being coupled with a fiber. The core has an overall width that progressively increases from the waveguide end toward the fiber end such that the width of the fiber end of the taper corresponds to the diameter of the core of the fiber. Side-gaps are disposed in the sides of the core and extend into the core but not across the entire width of the core. The depth of the side-gaps progressively increases from the waveguide end to the fiber end of the taper. In one embodiment, the side-gaps may be aperiodically and/or randomly disposed along the length of the taper and the side-gaps can be disposed at different angles to a direction of light propagation along a length of the core.