Hao Y Xu

US Patent:

6697552, Feb 24, 2004

Filed:

May 3, 2001

Appl. No.:

09/848093

Inventors:

Kenneth McGreer - Fremont CA
Liang Zhao - San Jose CA
Jane Lam - San Jose CA
Hao Xu - Sunnyvale CA

Assignee:

Lightwave Microsystems Corporation - San Jose CA

International Classification:

G02B 634

US Classification:

385 37, 385 43, 385 50

Abstract:

The present invention generally provides an optical wavelength router that includes at least one dendritic taper region. The dendritic taper region includes at least one dendritic taper which has a trunk and at least one branch optically coupled to the trunk. In addition to the dendritic taper region, the optical wavelength router includes at least one input waveguide, a input slab waveguide, an arrayed waveguide grating, an output slab waveguide, and at least one output waveguide. The improved optical wavelength router provides a wide passband width without a substantial effect on insertion loss.

US Patent:

6823103, Nov 23, 2004

Filed:

Sep 18, 2001

Appl. No.:

09/955630

Inventors:

Jane Lam - San Jose CA
Liang Zhao - San Jose CA
Kenneth McGreer - Fremont CA
Hao Xu - Sunnyvale CA
Wayne Wai Wing Lui - Fremont CA

Assignee:

Lightwave Microsystems Corporation - San Jose CA

International Classification:

G02B 628

US Classification:

385 24, 385 15, 385 31

Abstract:

The invention relates to an optical device which carries multiple optical signals where the optical device has a plurality of distal waveguides some of which may be configured to control insertion loss among the multiple optical signals.

US Patent:

6999724, Feb 14, 2006

Filed:

Jun 20, 2002

Appl. No.:

10/176453

Inventors:

Dmitry Chizhik - Highland Park NJ, US
Hao Xu - Eatontown NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 1/10

US Classification:

455 631, 455 65, 455101, 455103, 4552761, 455504, 342370

Abstract:

A method and apparatus for reducing the observed rate of change of the channel characteristics in a system with multiple antennas at a mobile terminal. The slowing down of the observed channel fluctuations is effectuated on the downlink by either calculating or receiving signals that have a similar Doppler shift, referred to herein as Doppler-compensatable signals, and processing one or more of the Doppler-compensatable signals to compensate for Doppler shift. The slowing down of the observed channel fluctuations is effectuated on the uplink by pre-compensating symbol streams with the Doppler shift associated with the direction in which they are transmitted, so that the observed Doppler shift of these signals when they are received is reduced or even eliminated.

US Patent:

7194162, Mar 20, 2007

Filed:

Feb 22, 2002

Appl. No.:

10/082603

Inventors:

Ming Yan - Pleasanton CA, US
Liang Zhao - San Jose CA, US
Hao Xu - Sunnyvale CA, US

Assignee:

NeoPhotonics Corporation - San Jose CA

International Classification:

G02B 6/34
G02B 6/00

US Classification:

385 37, 385 31

Abstract:

A method of optimizing a filter response of an arrayed waveguide grating is disclosed. The method includes the step of measuring a respective phase error of a plurality of waveguide cores of the arrayed waveguide grating. Once the phase error is measured, a respective optical path length of the cores is adjusted in accordance with the respective phase error of the cores. Optical path length is adjusted by adjusting a respective refractive index of the cores. The respective optical path length can be controlled to nanometer accuracies by adjusting the respective refractive index of the cores.

US Patent:

7447393, Nov 4, 2008

Filed:

Jan 16, 2004

Appl. No.:

10/760145

Inventors:

Ming Yan - Pleasanton CA, US
Anthony J. Ticknor - Cupertino CA, US
Calvin Ho - San Jose CA, US
Hao Xu - San Jose CA, US
Jason Weaver - San Jose CA, US
Thomas S. Tarter - San Jose CA, US
Jane Lam - San Jose CA, US

Assignee:

Neophotonics Corporation - San Jose CA

International Classification:

G02B 6/12

US Classification:

385 14, 385129

Abstract:

A linearized thermal and optical model of an optical integrated circuit can be used to temperature-stabilize one or more optical elements of the circuit using active temperature regulation. To stabilize a single optical element, such as an arrayed waveguide grating (AWG), a temperature sensor and a heater can be provided proximate to the grating. Thermal and optical coefficients can be then used to select an appropriate temperature set-point for the temperature controller that receives readings from the sensor and determines the power dissipated in the heater. Multiple AWG's can be stabilized individually, using the same process and lumping cross-heating factors together with other environmental factors. Alternatively, multiple AWG's can be stabilized using fewer sensors than AWG's, by stabilizing one of the AWG's in the same manner as in the case of a single AWG, and determining power dissipated in the heaters of the remaining AWG's based on the linearized model.

US Patent:

7587138, Sep 8, 2009

Filed:

Feb 23, 2007

Appl. No.:

11/678485

Inventors:

Kenneth Mc Greer - Fremont CA, US
Anthony J. Ticknor - Cupertino CA, US
Hao Xu - San Jose CA, US

Assignee:

NeoPhotonics Corporation - San Jose CA

International Classification:

H04J 14/02
G02B 6/28
G02B 6/26

US Classification:

398 82, 385 24, 385 31

Abstract:

An optical device containing a four-port optical mixer capable of distributing the optical power presented at either or both of two input ports to specified ratios in two output ports.

US Patent:

7720328, May 18, 2010

Filed:

Sep 30, 2008

Appl. No.:

12/241860

Inventors:

Ming Yan - Pleasanton CA, US
Anthony J. Ticknor - Cupertino CA, US
Calvin Ho - San Jose CA, US
Hao Xu - San Jose CA, US
Jason Weaver - San Jose CA, US
Thomas S. Tarter - San Jose CA, US
Jane Lam - San Jose CA, US

Assignee:

NeoPhotonics Corporation - San Jose CA

International Classification:

G02B 6/12

US Classification:

385 14

Abstract:

A linearized thermal and optical model of an optical integrated circuit can be used to temperature-stabilize one or more optical elements of the circuit using active temperature regulation. To stabilize a single optical element, a temperature sensor and a heater can be provided proximate to the grating. Thermal and optical coefficients can be then used to select an appropriate temperature set-point for the temperature controller that receives readings from the sensor and determines the power dissipated in the heater. Multiple optical elements can be stabilized individually, using the same process and lumping cross-heating factors together with other environmental factors. Alternatively, multiple AWG's can be stabilized using fewer sensors than optical elements, by stabilizing one of the optical elements in the same manner as in the case of a single optical elements, and determining power dissipated in the heaters of the remaining optical elements based on the linearized model.

US Patent:

7865663, Jan 4, 2011

Filed:

Feb 16, 2007

Appl. No.:

11/707359

Inventors:

Michael Nelson - Alamo CA, US
Hao Xu - Sunnyvale CA, US
Daniel J. Scales - Mountain View CA, US
Matthew B. Amdur - San Francisco CA, US

Assignee:

VMware, Inc. - Palo Alto CA

International Classification:

G06F 13/00
G06F 13/28
G06F 9/455

US Classification:

711112, 711154, 711E12014, 718 1

Abstract:

A virtualization technique, in accordance with one embodiment of the present invention, includes emulating the small computing system interface (SCSI) protocol to access a virtual SCSI storage device backed by a file stored on network attached storage (NAS).