Xiangdong Qiu

US Patent:

6922281, Jul 26, 2005

Filed:

May 3, 2002

Appl. No.:

10/138033

Inventors:

Jing-Jong Pan - Milpitas CA, US
Xiangdong Qiu - Cupertino CA, US
Kejian Guan - San Jose CA, US
Mingjie Zhang - San Jose CA, US

Assignee:

Lightwaves 2020, Inc. - Milpitas CA

International Classification:

H01S003/00

US Classification:

3593411

Abstract:

An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section. The resulting EDFAs can be manufactured relatively inexpensively into an very small packages compared to current EDFA packages.

US Patent:

7044660, May 16, 2006

Filed:

Jul 21, 2005

Appl. No.:

11/161059

Inventors:

Jing-Jong Pan - Milpitas CA, US
Xiangdong Qiu - Cupertino CA, US
Kejian Guan - San Jose CA, US
Mingjie Zhang - San Jose CA, US

Assignee:

Lightwaves 2020, Inc. - Milpitas CA

International Classification:

G02B 6/36
H01S 3/00

US Classification:

385 93, 3593413

Abstract:

An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section. The resulting EDFAs can be manufactured relatively inexpensively into an very small packages compared to current EDFA packages.

US Patent:

7130121, Oct 31, 2006

Filed:

Mar 20, 2006

Appl. No.:

11/276997

Inventors:

Jing-Jong Pan - Milpitas CA, US
Xiangdong Qiu - Cupertino CA, US
Kejian Guan - San Jose CA, US
Mingjie Zhang - San Jose CA, US

Assignee:

Lightwaves 2020, Inc. - Milpitas CA

International Classification:

G02B 27/28

US Classification:

359494

Abstract:

An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section connected to the amplifying erbium-doped optical fiber section. The fiber section is formed from an optical fiber which better matches the transmission modes in the erbium-doped optical fiber section and has an end subsection of the single mode fiber for a larger numerical aperture. Collimating lenses also increase the coupling efficiency of the laser diode to the erbium-doped fiber section. The integrated output module has a photodiode with a tap filter to monitor the output power of the EDFA, an optical isolator to prevent interference in the erbium-doped optical fiber section. With a twin optical isolator, the integrated input and output modules can be arranged in different ways and combinations with the erbium-doped optical fiber section. The resulting EDFAs can be manufactured relatively inexpensively into an very small packages compared to current EDFA packages.

US Patent:

7668214, Feb 23, 2010

Filed:

May 7, 2008

Appl. No.:

12/116834

Inventors:

Gordon Wilson - San Francisco CA, US
Xiangdong Qiu - Cupertino CA, US
YuZhong Dai - Cupertino CA, US

Assignee:

JDS Uniphase Corporation - Milpitas CA

International Classification:

H01S 3/10

US Classification:

372 23, 372 5023, 372101

Abstract:

An apparatus for coupling radiation of individual laser diode emitters into a common optical fiber is disclosed. The radiation is collimated along fast axis and combined by using crossed pairs of flat mirrors. The combined beams are collimated by a common slow axis collimating lens. The laser diode emitters are disposed on both sides of an optical axis of the slow axis collimating lens such that the optical path lengths from the emitters to the slow axis collimating lens are equal.

US Patent:

8215850, Jul 10, 2012

Filed:

Dec 29, 2009

Appl. No.:

12/648580

Inventors:

Prasad Yalamanchili - Santa Clara CA, US
Xiangdong Qiu - Cupertino CA, US
Reddy Raju - Fremont CA, US
Jihua Du - Santa Clara CA, US

International Classification:

G02B 6/36
G02B 6/42

US Classification:

385 94, 385 92, 385138

Abstract:

A molded ceramic or glass ferrule has at least one longitudinal passage, which enables an optical fiber feed through, sealed into a metal housing with glass solder. The metal material in the housing has a slightly higher coefficient of thermal expansion (CTE) than the ferrule material and the sealing glass so that hermetic seal is maintained by a compression stress applied to the ferrule and sealing glass by the housing at operating conditions. When the housing has to be fabricated from a low CTE material, e. g. metal or ceramic, a metal sleeve and stress relief bracket is used to apply the compression stress.

US Patent:

8475056, Jul 2, 2013

Filed:

Jul 26, 2010

Appl. No.:

12/843823

Inventors:

Prasad Yalamanchili - Santa Clara CA, US
Xiangdong Qiu - Cupertino CA, US
Reddy Raju - Fremont CA, US
Jay A. Skidmore - San Jose CA, US
Michael Au - Fremont CA, US
Laura Zavala - Mountain view CA, US
Richard L. Duesterberg - Mountain View CA, US

Assignee:

JDS Uniphase Corporation - Milpitas CA

International Classification:

G02B 6/36

US Classification:

385 88, 385 14, 385 53

Abstract:

A fiber coupled semiconductor device having an improved optical stability with respect to temperature variation is disclosed. The stability improvement is achieved by placing the platform holding the semiconductor chip and the optical fiber onto a spacer mounted on a base. The spacer has an area smaller than the area of the platform, for mechanical decoupling of thermally induced deformation of the base from a deformation of the platform of the semiconductor device. Attaching the optical fiber to a vertical mounting surface of a fiber mount, and additionally attaching the fiber mount to a submount of the semiconductor chip further improves thermal stability of the packaged device.

US Patent:

20030128986, Jul 10, 2003

Filed:

Dec 18, 2002

Appl. No.:

10/324391

Inventors:

Kuochou Tai - Fremont CA, US
Xiangdong Qiu - Cupertino CA, US

Assignee:

JDS Uniphase Corporation - San Jose CA

International Classification:

H04J014/02

US Classification:

398/084000, 398/085000

Abstract:

The invention relates to an add/drop multiplexer utilizing at least two stages of wavelength interleaver technology to provide high isolation, while dropping and adding subsets of periodically spaced wavelength channels. The primary function is to separate a first subset of periodically spaced wavelength channels, e.g. even ITU channels, from an input signal, and then to combine the remaining channels, e.g. odd ITU channels, with another subset of channels having the same center wavelengths as the separated channels. The separation and combination are conducted in separate wavelength interleavers providing two stages of filtering to the output signals. Any form of wavelength interleaver is useable in the present invention, including multi-cavity etalon interleavers, Michelson Gires-Tournois interleavers, birefringent crystal interleavers, and birefringent Michelson Gires-Tournois interleavers.

US Patent:

20110026558, Feb 3, 2011

Filed:

Jul 27, 2010

Appl. No.:

12/844698

Inventors:

Reddy RAJU - Fremont CA, US
Richard L. Duesterberg - Mountain View CA, US
Jay A. Skidmore - San Jose CA, US
Prasad Yalamanchili - Santa Clara CA, US
Xiangdong Qiu - Cupertino CA, US

Assignee:

JDS Uniphase Corporation - Milpitas CA

International Classification:

H01S 5/026
H01L 21/50

US Classification:

372 501, 438 27, 257E21499

Abstract:

A fiber coupled semiconductor device and a method of manufacturing of such a device are disclosed. The method provides an improved stability of optical coupling during assembly of the device, whereby a higher optical power levels and higher overall efficiency of the fiber coupled device can be achieved. The improvement is achieved by attaching the optical fiber to a vertical mounting surface of a fiber mount. The platform holding the semiconductor chip and the optical fiber can be mounted onto a spacer mounted on a base. The spacer has an area smaller than the area of the platform, for mechanical decoupling of thermally induced deformation of the base from a deformation of the platform of the semiconductor device. Optionally, attaching the fiber mount to a submount of the semiconductor chip further improves thermal stability of the packaged device.