Yuan P 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:

6539149, Mar 25, 2003

Filed:

Sep 20, 1999

Appl. No.:

09/399575

Inventors:

Giovanni Barbarossa - Tucker GA
Leonard George Cohen - Atlanta GA
Yuan P. Li - Duluth GA
Yan Wang - Norcross GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 634

US Classification:

385 37, 359571

Abstract:

In accordance with the invention, an optical router for an optical communications system comprises a pair of transmissive Echelle gratings having their grating surfaces coupled by a waveguide grating. The arrangement provides for substantial design freedom in that the dispersive parameters include the shapes of the first and second Echelle gratings as well as the path length difference among the waveguides. Moreover the device eliminates any need for reflective surfaces in the Echelle gratings.

US Patent:

6658181, Dec 2, 2003

Filed:

Jan 2, 2002

Appl. No.:

10/038508

Inventors:

Yan Wang - Norcross GA
Yuan P. Li - Duluth GA

Assignee:

Wavesplitter Technologies, Inc. - Fremont CA

International Classification:

G02B 612

US Classification:

385 37, 385 24, 385 27, 385 14

Abstract:

A method and apparatus provides a WDM optical signal having a plurality of channels with a pair-wise orthogonal polarization state. The method begins by receiving a plurality of unpolarized optical wavelengths defining a plurality of optical channels separated by a prescribed channel spacing. A polarization wavelength dependent shift is imparted to the optical wavelengths, which is substantially equal to a particular fraction of the prescribed channel spacing.

US Patent:

6917760, Jul 12, 2005

Filed:

Dec 31, 2001

Appl. No.:

10/039242

Inventors:

Yuan P. Li - Duluth GA, US
Yan Wang - Norcross GA, US
Kevin Sullivan - Fremont CA, US

Assignee:

Wavesplitter Technologies, Inc. - Fremont CA

International Classification:

H04B010/00

US Classification:

398 82, 398 48

Abstract:

A method and apparatus is provided for reformatting or interleaving a WDM signal that includes a plurality of optical channels having a first bandwidth and a first channel spacing. The method begins by receiving the WDM signal and dividing it into first and second subsets of optical channels each having a second channel spacing. Next, the first subset of optical channels are divided into third and fourth subsets of optical channels each having a third channel spacing. In addition, the second subset of optical channels is divided into fifth and sixth subsets of optical channels each having a fourth channel spacing. The third and fifth subsets of optical channels are combined to generate a first output WDM signal, while the fourth and sixth subsets of optical channels are combined to generate a second output WDM signal.

US Patent:

7006729, Feb 28, 2006

Filed:

Dec 31, 2001

Appl. No.:

10/039245

Inventors:

Yan Wang - Norcross GA, US
Yuan P. Li - Duluth GA, US

Assignee:

Wavesplitter Technologies, Inc. - Fremont CA

International Classification:

G02B 6/34
G02B 6/26

US Classification:

385 37, 385 46

Abstract:

An optical device is provided which includes a slab waveguide and at least one input waveguide coupled to a first side of the slab waveguide. The device also includes a plurality of output waveguides coupled to a second side of the slab waveguide. The slab waveguide has a segmented transition region that includes a plurality of waveguiding regions spaced apart from one other by at least one discrete sector.

US Patent:

57063770, Jan 6, 1998

Filed:

Jul 17, 1996

Appl. No.:

8/682453

Inventors:

Yuan P. Li - Duluth GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 626

US Classification:

385 37

Abstract:

A wavelength routing device 500 includes a pair of dielectric slabs 10, 20 that are interconnected by an optical grating 30. The first dielectric slab 10 includes input ports for receiving optical signals that are routed to output ports of the second dielectric slab 20 according to their wavelengths. Y-branch splitters 70-1 are connected to the first dielectric slab. Splitters 70-1 each include a pair of adjacent waveguides, having widths (w. sub. 1), that are separated from each other by a center-to-center distance (c. sub. 1). Y-branch splitter 70-2 is connected to the second dielectric slab. Splitter 70-2 includes a pair of adjacent waveguides, having widths (w. sub. 2), that are separated from each other by a center-to-center distance (c. sub. 2). Preferably, 4w. sub. 2 >w. sub. 1 >1. 5w. sub. 2, and 4c. sub. 2 >c. sub. 1 >1. 5c. sub. 2. Associated with this routing device is a figure-of-merit (B. sub. 1 /B. sub.

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:

59148896, Jun 22, 1999

Filed:

Sep 13, 1996

Appl. No.:

8/713582

Inventors:

Leonard George Cohen - Atlanta GA
Charles Howard Henry - Skillman NJ
Yuan P. Li - Duluth GA
Morton I. Schwartz - Alpharetta GA
Yan Wang - Chamblee GA
Henry Howard Yaffe - Reisterstown MD

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06F 1700
G06F 1750

US Classification:

364491

Abstract:

A computer system and method provide a CAD tool by which a mask for an application specific optical integrated circuit, chip, or wafer may be generated both easily and quickly. The method involves the step of receiving the design for an optical circuit with the circuit design including at least one optical component. Each optical component in the optical circuit is defined by one or more geometric shapes, such as a trapezoid, rectangle, or an arcuate polygon. The method further includes the step of retrieving parameters which define the manufacturing standard by which the optical circuit will be fabricated as well as parameters which define the optical components in the optical circuit. Based on the parameters and the geometric shapes, a plot is generated which forms a mask layout for the optical circuit. The mask layout can then be viewed by a graphical editor whereby a designer can receive visual confirmation that the mask layout accurately portrays the desired optical circuit, chip, or wafer.