Ming Li

US Patent:

6529307, Mar 4, 2003

Filed:

Jun 4, 2001

Appl. No.:

09/874474

Inventors:

Song Peng - Pleasanton CA
Ming Li - Pleasanton CA

Assignee:

Avanex Corporation - Fremont CA

International Classification:

G02F 103

US Classification:

359256, 359315, 359319, 359245, 359250

Abstract:

A method and apparatus for achieving dynamic intensity modulation of the channels in a wavelength-division multiplexed optical communication system is presented. Wavelengths are spatially separated into a plurality of channels, the polarization states of which are individually modulated. The channels can be combined or filtered by polarization states to achieve the desired intensity in the output signal. An exemplary embodiment includes at least a polarization modulator, a birefringent wedge, a lens, and a dispersive element (e. g. , diffraction grating) arranged in various order. Each segment of the polarization modulator can be made to rotate the polarization direction of an incident channel by a specified angle. A half-wave plate may be inserted between the second dispersive element and the second birefringent wedge to eliminate polarization-dependent loss. Optionally, a parallel birefringent plate may be inserted after the second birefringent wedge to reduce polarization mode dispersion.

US Patent:

6546159, Apr 8, 2003

Filed:

Aug 22, 2002

Appl. No.:

10/225650

Inventors:

Song Peng - Pleasanton CA
Ming Li - Pleasanton CA

Assignee:

Avanex Corporation - Fremont CA

International Classification:

G02B 600

US Classification:

385 11, 356399, 2502014, 349 77

Abstract:

An improved digital differential group delay (DGD) controller is capable of producing variable DGD used to compensate for DGD in a fiber optic link in real time. The DGD controller comprises one or more sets of a polarization modulator optically coupled with a fixed delay component, such as a birefringent plate. Each set provides an amount of DGD compensation. By controlling the number of stages in the controller, the amount of DGD compensation provided by each stage, and which stages are placed in the ON state, the total amount of DGD compensation provided by the digital DGD controller can be varied.

US Patent:

6594082, Jul 15, 2003

Filed:

Feb 26, 2001

Appl. No.:

09/794590

Inventors:

Ming Li - Pleasanton CA
Song Peng - Fremont CA

Assignee:

Avanex Corporation - Fremont CA

International Classification:

G02B 2600

US Classification:

359618, 359290, 385 11

Abstract:

An optical wavelength router utilizes a dispersive medium (e. g. , a diffraction grating) and reflective surfaces. The dispersive medium separates an input optical signal (light beam) into a plurality of components, for example by wavelengths. The reflective surfaces convert the components into separate output beams traveling in the desired directions. The number and the direction of the output beams can be controlled by manipulating the angle of incidence at which the components strike the reflective surfaces. A micro-mirror array modulator serves as the reflective surfaces. Each mirror in the micro-mirror array modulator is positioned to direct individual components into a number of output signals. Alternatively, a polarization steering device which includes a polarization modulator and at least one birefringent element in addition to reflective surfaces is utilized. A Wollaston prism with a reflective surface may also be used.

US Patent:

6720251, Apr 13, 2004

Filed:

Nov 21, 2001

Appl. No.:

09/990197

Inventors:

Bart van Schravendijk - Sunnyvale CA
Ming Li - Pleasanton CA
Jason Tian - Milpitas CA
Tom Mountsier - San Jose CA
M. Zlaul Karim - San Jose CA

Assignee:

Novellus Systems, Inc. - San Jose CA

International Classification:

H01L 21205

US Classification:

438636, 438790

Abstract:

A nitrogen-free anti-reflective layer for use in semiconductor photolithography is fabricated in a chemical vapor deposition process, optionally plasma-enhanced, using a gaseous mixture of carbon, silicon, and oxygen sources. By varying the process parameters, acceptable values of the refractive index n and extinction coefficient k can be obtained. The nitrogen-free anti-reflective layer produced by this technique eliminates the mushrooming and footing problems found with conventional anti-reflective layers.

US Patent:

6728488, Apr 27, 2004

Filed:

Jan 23, 2002

Appl. No.:

10/056452

Inventors:

Song “Sean” Peng - Pleasanton CA
Ming “Miles” Li - Pleasanton CA

Assignee:

Avanex Corporation - Fremont CA

International Classification:

H04J 1402

US Classification:

398 86, 358 87, 359639, 359640

Abstract:

An optical device includes: a collimator; at least one anamorphic pair of prisms optically coupled to the collimator; a diffraction grating optically coupled to the at least one anamorphic pair of prisms at a side opposite to the collimator; and a focusing lens optically coupled to the diffraction grating. The anamorphic pair of prisms permits light incident upon the diffraction grating to be relatively narrow in a dimension perpendicular to the dispersive direction of the grating so that the grating can produce high spectral resolution while preserving compact system size and simplicity.

US Patent:

6870246, Mar 22, 2005

Filed:

Aug 31, 2001

Appl. No.:

09/944545

Inventors:

Donald R. Mullen - Mountain View CA, US
Belgacem Haba - Cupertino CA, US
Ming Li - Fremont CA, US

Assignee:

Rambus Inc. - Los Altos CA

International Classification:

H01L023/02

US Classification:

257678, 257713

Abstract:

An integrated circuit cover incorporating a spring portion is described. The spring portion may include any structure that allows displacement between a plate portion of the integrated circuit cover and an attachment portion of the integrated circuit cover and that provides a substantially equalizing effect of pressure on the plate portion. The spring portion is preferably more flexible than the plate portion. The integrated circuit cover accommodates variations in the mounted height of integrated circuits over which the integrated circuit cover is installed The integrated circuit cover may be formed as a unitary structure or may be constructed as an assembly of multiple components.

US Patent:

6947628, Sep 20, 2005

Filed:

Aug 28, 2002

Appl. No.:

10/231407

Inventors:

Song Peng - Pleasanton CA, US
Ming Li - Pleasanton CA, US

Assignee:

Avanex Corporation - Fremont CA

International Classification:

G02B006/26

US Classification:

385 18, 385 16, 385 15

Abstract:

A wavelength-selective optical add-drop switch includes a first and a second 1×2 wavelength switch optically coupled to one another via at least one mirror. Each of the first and second 1×2 wavelength switches has a switch input and two switch outputs, a wavelength dispersive medium optically coupled to the switch input and the two switch outputs, a lens optically coupled to the wavelength dispersive medium and a segmented beam steering apparatus optically coupled to the lens opposite to the wavelength dispersive medium. The add-drop wavelength switch has a high extinction ratio and low loss.

US Patent:

7052988, May 30, 2006

Filed:

Feb 5, 2004

Appl. No.:

10/773821

Inventors:

Bart van Schravendijk - Sunnyvale CA, US
Ming Li - Pleasanton CA, US
Jason Tian - Milpitas CA, US
Tom Mountsier - San Jose CA, US
M. Ziaul Karim - San Jose CA, US

Assignee:

Novellus Systems, Inc. - San Jose CA

International Classification:

H01L 21/44

US Classification:

438636

Abstract:

A nitrogen-free anti-reflective layer for use in semiconductor photolithography is fabricated in a chemical vapor deposition process, optionally plasma-enhanced, using a gaseous mixture of carbon, silicon, and oxygen sources. By varying the process parameters, acceptable values of the refractive index n and extinction coefficient k can be obtained. The nitrogen-free anti-reflective layer produced by this technique eliminates the mushrooming and footing problems found with conventional anti-reflective layers.