Ming Chen 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:

6556306, Apr 29, 2003

Filed:

Jan 4, 2001

Appl. No.:

09/754183

Inventors:

Zhiping Jiang - Ottawa, CA
Ming Li - Cupertino CA

Assignee:

Rensselaer Polytechnic Institute - Troy NY

International Classification:

G01B 902

US Classification:

356517, 356487

Abstract:

A non-contact, free-space method for determining the index of refraction of a thin film at a desired angular frequency. The method includes generating an input desired-frequency pulse and an optically detectable probe pulse. The thin film is moved in and out of the path of the input pulse, creating an output pulse that alternates between a transmitted signal, created when the film intercepts the input pulse path, and a reference signal, created when the sample is outside the input pulse path. The output pulse modulates the probe pulse, which is then detected with a photo detector, and the difference between the transmitted signal and the reference signal is calculated. The above steps are repeated over a plurality of delay times between the input pulse and the probe pulse until a complete field waveform of the differential signal is characterized. The index of refraction is calculated as a function of a ratio between the differential signal for the thin film and the reference signal. A complete field waveform of the reference signal may be characterized by repeating the above steps for a reference plate identical to the sample except having a non-transmissive film instead of the thin, transmissive film.

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:

6833161, Dec 21, 2004

Filed:

Feb 26, 2002

Appl. No.:

10/084767

Inventors:

Shulin Wang - Campbell CA
Ulrich Kroemer - Jena, DE
Lee Luo - Fremont CA
Aihua Chen - San Jose CA
Ming Li - Cupertino CA

Assignee:

Applied Materials, Inc. - Santa Clara CA

International Classification:

C23C 1614

US Classification:

427250, 427253, 427255392, 427255394, 4272557

Abstract:

A method for depositing a tungsten nitride layer is provided. The method includes a cyclical process of alternately adsorbing a tungsten-containing compound and a nitrogen-containing compound on a substrate. The barrier layer has a reduced resistivity, lower concentration of fluorine, and can be deposited at any desired thickness, such as less than 100 angstroms, to minimize the amount of barrier layer material.

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.