Yuan Li

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:

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.

US Patent:

59262982, Jul 20, 1999

Filed:

Aug 30, 1996

Appl. No.:

8/709240

Inventors:

Yuan P. Li - Duluth GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 1020

US Classification:

359120

Abstract:

An optical multiplexer/demultiplexer 500 comprises first and second star couplers 41, 42 that are interconnected by a number of optical waveguides 430 of unequal length (i. e. , a grating). The multiplexer/demultiplexer functions to distribute optical signals in a first-wavelength region. lambda. sub. A (around 1550 nm) from one input port 401 of the first star coupler 41 to individual output ports 426 of the second star coupler 42 according to wavelength. The first star coupler includes at least one other input port 402 for receiving optical signals in a second wavelength region. lambda. sub. B (around 1310 nm) to be broadcast to all output ports of the second star coupler. In order to properly broadcast the optical signals in the second wavelength region, a power splitter 50 is connected in series with the other input port(s) of the first star coupler. The combined width w. sub. 1 of the output port(s) of the power splitter is greater than the width w. sub.

US Patent:

56804903, Oct 21, 1997

Filed:

Sep 8, 1995

Appl. No.:

8/525938

Inventors:

Leonard G. Cohen - Atlanta GA
Yuan P. Li - Duluth GA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G02B 628

US Classification:

385 24

Abstract:

A comb splitting system demultiplexes and/or multiplexes a plurality of optical signal channels at various wavelengths. The comb splitting system has at least two interconnected successive stages of wavelength division multiplexers (WDMs). A WDM of a first stage communicates bands of channels to respective WDMs of the second stage via suitable optical paths. Each of the bands has a plurality of the individual channels that are separated by at least one other of the channels. Each second stage WDM, which is allocated to a particular band, is interconnected to optical paths, each for carrying one or more individual channels. Furthermore, in accordance with a significant feature of the present invention, the bandpasses and bandpass periodicity (free spectral range) associated with the first stage WDM are smaller than the bandpasses and bandpass periodicity associated with the second stage WDMs. The foregoing feature has numerous advantages. The second stage WDMs are less expensive and physically smaller than the first stage WDM.