Yu U Zheng

US Patent:

6347170, Feb 12, 2002

Filed:

May 6, 1999

Appl. No.:

09/306373

Inventors:

Yu Zheng - Sunnyvale CA

Assignee:

JDS Uniphase, Inc. - Ontario

International Classification:

G02B 632

US Classification:

385 34, 385 16, 385 74

Abstract:

The present invention discloses an improved wavelength division multiplexed (WDM) coupler. The WDM coupler includes a WDM filter attached to a first GRIN lens by applying a first heat-curing epoxy. The WDM coupler further includes the first GRIN lens inserted and fixed into a first holding tube by applying a second heat-curing epoxy. The WDM coupler further includes a second holding tube holding a dual fiber pigtail. The dual fiber pigtail is disposed at a first optimal position from the first GRIN lens to achieve a lowest reflection loss with the first and second holding tubes being in contact with each other. The dual fiber pigtail and the first and second holding tubes are fixed together by applying a third heat-curing epoxy. The WDM coupler further includes a second GRIN lens inserted and fixed into a third holding tube by applying a fourth heat-curing epoxy. The WDM coupler further includes a fourth holding tube holding a standard single fiber pigtail.

US Patent:

6485190, Nov 26, 2002

Filed:

May 18, 1999

Appl. No.:

09/315364

Inventors:

Yu Zheng - Sunnyvale CA

Assignee:

JDS Uniphase Inc. - Ontario

International Classification:

G02B 638

US Classification:

385 61, 385 51, 385 52, 385139, 385147

Abstract:

The present invention discloses an improved in-line micro-optic component. The in-line micro-optic component includes an optical core attached to a first optical collimator by applying a first heat-curing epoxy. The in-line micro-optic component further includes a first gold-plated stainless steel holder holding the first optical collimator. The first optical collimator is inserted and fixed in the first stainless steel holder by applying a second heat-curing epoxy. The inline micro-optic component coupler further includes a second optical collimator. The in-line micro-optic component coupler further includes a second gold-plated stainless steel holder holding the second optical collimator. The second optical collimator is inserted and fixed in the second stainless steel holder by applying a third heat-curing epoxy. After the optical alignment between the first optical collimator with the optical core and the second optical collimator is done to achieve a lowest transmission loss, the first and the second stainless steel holders are soldered together.

US Patent:

7487488, Feb 3, 2009

Filed:

Oct 6, 2006

Appl. No.:

11/544105

Inventors:

Dajen Huang - Sunnyvale CA, US
Yi Wu - Santa Clara CA, US
Arjun Dutt - Santa Clara CA, US
Yu L. Zheng - Fremont CA, US

Assignee:

Sun Microsystems, Inc. - Santa Clara CA

International Classification:

G06F 17/50

US Classification:

716 14, 716 10

Abstract:

A mechanism is disclosed for assigning repeaters to signal paths in an integrated circuit design. The mechanism involves reserving, in a first metal layer of the integrated circuit design, metal tracks for routing signals. Access points to a plurality of repeaters are reserved in a second metal layer of the integrated circuit design. Each access point is associated with a particular repeater. The design may have other layers between the second metal layer and a region reserved for the repeaters. The number of repeaters may be based on the number of metal tracks that are available to route signals through the first region. Signal paths are assigned routes that comprise at least a portion of one or more of the metal tracks. A route from signal paths requiring a repeater to access points to a particular repeater is determined. Thus, the signal paths are assigned to a repeater.

US Patent:

20030103540, Jun 5, 2003

Filed:

Dec 5, 2001

Appl. No.:

10/010988

Inventors:

Yu Zheng - Cupertino CA, US

International Classification:

H01S005/10

US Classification:

372/092000

Abstract:

A new low-cost Fabry-Perot (FP) laser with narrow spectral width and low sensitivity to reflections and temperature variation is disclosed in this invention. The new FP laser includes a mirror, a laser gain medium, and a partial wavelength mirror. The partial wavelength mirror has a low-cost reflective wavelength filter coating on it. The reflective wavelength filter has a narrow reflective passband width, i.e., less than 2 nm at FWHM, and a peak reflectivity of around 30% with an isolation of over 25 dB outside the reflective passband. Also the reflective wavelength filter has low wavelength thermal dependence of 0.01 nm/C or less.

US Patent:

20030103541, Jun 5, 2003

Filed:

Mar 11, 2002

Appl. No.:

10/095949

Inventors:

Yu Zheng - Cupertino CA, US

International Classification:

H01S003/08

US Classification:

372/092000

Abstract:

An improved low-cost Fabry-Perot (FP) laser with narrow spectral width and low sensitivity to reflections and temperature variation is disclosed in this invention. The improved FP laser includes a mirror, a laser gain medium (chip), an anti-reflection coating, and a wavelength mirror. The laser chip has the mirror on its non-light emitting facet and the anti-reflection coating on its light emitting facet. The wavelength mirror is coated on a glass substrate. Both the laser chip and the wavelength mirror are fixed onto a submount. The wavelength mirror has a low-cost reflective wavelength filter coating on it. The reflective wavelength filter has a narrow reflective passband width, i.e., less than 2 nm at FWHM, and a peak reflectivity of around 30% with an isolation of over 25 dB outside the reflective passband. Also the reflective wavelength filter has low wavelength thermal dependence of 0.01 nm/C or less.

US Patent:

20030214714, Nov 20, 2003

Filed:

May 14, 2002

Appl. No.:

10/144954

Inventors:

Yu Zheng - Cupertino CA, US

International Classification:

G02B005/30
G02B027/28
H01S003/00

US Classification:

359/484000, 359/494000, 359/495000, 359/497000, 372/703000

Abstract:

A new low-cost free-space optical isolator is disclosed in this invention. The new free-space optical isolator includes an input polarizer, a Faraday rotator, an output polarizer, and a magnetic tube. By employing the recently developed subwavelength optical elements (SOEs) technology, the input polarizer is directly manufactured on the left surface of the Faraday rotator and the output polarizer is directly manufactured on the right surface of the Faraday rotator. Relative to the polarization axis of the input polarizer, the polarization axis of the output polarizer is 45 degrees clockwise from left to right.

US Patent:

61671754, Dec 26, 2000

Filed:

Jul 8, 1999

Appl. No.:

9/349549

Inventors:

Yu Zheng - Sunnyvale CA
Feng Liu - Sunnyvale CA
Steven Guoxin Zhu - Fremont CA

Assignee:

Oplink Communications, Inc. - San Jose CA

International Classification:

G02B 626

US Classification:

385 47

Abstract:

A system and method for providing a wavelength division multiplexer is disclosed. In one aspect, the system and method include providing a housing for the wavelength division multiplexer. The housing includes a first port having a first aperture therein, a second port having a second aperture and a first plurality of apertures therein, and a third port having a third aperture and a second plurality of apertures therein. The second and third apertures are coupled to the first aperture. The first plurality of apertures are disposed symmetrically around the second aperture. The second plurality of apertures are disposed symmetrically around the third aperture. In another aspect, the method and system include providing a wavelength division multiplexer. The wavelength division multiplexer includes a first port including a first collimator, a second port coupled to the first port, and a third port coupled to the first port. The second port includes a second collimator and a first plurality of joints for affixing the second collimator.

US Patent:

61481262, Nov 14, 2000

Filed:

Oct 7, 1998

Appl. No.:

9/167805

Inventors:

Yu Zheng - Sunnyvale CA

International Classification:

G02B 632

US Classification:

385 34

Abstract:

This invention discloses a dual-fiber optical collimator. The collimator includes a dual fiber pigtail and a GRIN lens wherein the dual fiber pigtail securely fixed to the GRIN lens by a ultraviolet-curing epoxy and a first heat-curing bonding epoxy. The collimator further includes a glass tube securely fixed to the dual fiber pigtail by a second heat-curing bonding epoxy. A stainless steel holder securely fixed to the glass tube by a third heat-curing bonding epoxy. The first, second and third heat-curing bonding epoxy is a heat-curing epoxy of 353ND epoxy. The ultraviolet-curing epoxy applied between the GRIN lens and the dual fiber pigtail is an ultraviolet-curing epoxy of ECI4481 epoxy or an ultravioet-curing epoxy of OG154 epoxy. The stainless steel holder securely fixed to the glass tube by a third heat-curing bonding epoxy is disposed a distance away from the first heat-curing bonding epoxy and the ultraviolet-curing epoxy.