Zheng Wang

US Patent:

6800764, Oct 5, 2004

Filed:

Nov 26, 2002

Appl. No.:

10/304322

Inventors:

Anthony Frank Kreft - Langhorne PA
Madelene Miyoko Antane - West Windsor NJ
Derek Cecil Cole - New City NY
Dennis Martin Kubrak - Philadelphia PA
Lynn Resnick - Edison NJ
Joseph Raymond Stock - Monroe NY
Zheng Wang - East Brunswick NJ

Assignee:

Wyeth - Madison NJ

International Classification:

C07D33332

US Classification:

549 65, 564302, 564487, 564489

Abstract:

A process is provided for preparing chirally pure S-enantiomers of -amino acids comprising the steps of: a) preparing an organometallic reagent from an alkyl halide of the formula (R) CH(CH ) CH X; b) adding the organometallic reagent to carbon dioxide to afford a carboxylic acid; c) activating the carboxylic acid with an acid chloride, phosphorus trichloride, acid anhydride, or thionyl chloride in the presence of a tertiary amine base; d) reacting the product of step c) with an alkali metal salt of S-4-benzyl-2-oxazolidinone; e) treating the product of step d) with a strong non-nucleophilic base to form an enolate anion; f) trapping the enolate anion with 2,4,6-triisopropylbenzenesulfonyl azide to afford an oxazolidinone azide; g) hydrolyzing the oxazolidinone azide with an aqueous base to afford an -azido acid; h) reducing the -azido acid to the -amino acid; and i) recrystallizing the -amino acid to the chirally pure -amino acid. A process is also provided for preparing chirally pure S-enantiomers of -amino alcohols further comprising the steps of reducing the crude -amino acid to the -amino alcohol and recrystallizing the -amino alcohol to the chirally pure -amino alcohol. A process is further provided for preparing chirally pure S enantiomers of N-sulfonyl -amino alcohols further comprising the steps of sulfonylating the -amino alcohol with 5-chloro-thiophene-2-sulfonyl halide; and recrystallizing to afford the chirally pure N-sulfonyl -amino alcohols.

US Patent:

7031051, Apr 18, 2006

Filed:

Mar 7, 2003

Appl. No.:

10/384228

Inventors:

Jian Liu - Sunnyvale CA, US
Zheng Wang - San Jose CA, US
Yonglin Huang - Milpitas CA, US
Xuejun Lu - Fremont CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H04B 10/12

US Classification:

3593412, 35934132, 398135

Abstract:

A dual fiber optic amplifier uses a single pump source for two or more optical power amplifiers. The dual fiber optic amplifier includes a pump source that emits light, a pump splitter, a first optical power amplifier and a second optical power amplifier. The pump splitter splits the light emitted by the pump source into two or more portions. The first optical power amplifier includes an optical fiber input, an optical fiber output, and a doped fiber portion, wherein the first portion of light from the splitter is coupled into the optical fiber input of the first optical power amplifier. The second optical power amplifier includes an optical fiber input, an optical fiber output, and a doped fiber portion, wherein the second portion of light emitted from the splitter is coupled into the optical fiber input of the second optical power amplifier.

US Patent:

7039278, May 2, 2006

Filed:

Jul 10, 2003

Appl. No.:

10/617006

Inventors:

Yonglin Huang - Milpitas CA, US
Zheng Wang - San Jose CA, US
Qi Deng - Cupertino CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

G02B 6/26
G02B 6/42
H04B 10/00

US Classification:

385 47, 385 11, 385 15, 385 24, 398125, 398138, 398139, 359484

Abstract:

An integrated transceiver for achieving bi-directional communication along a single fiber-optic cable in a fiber-optic network. The transceiver includes an active part for transmit and receive portions of the transceiver. The active part includes a photo diode and a laser diode attached to a substrate. Bi-directional communication is achieved by using an optical circulator. The optical circulator may include components that limit back reflections into the active part of the transceiver. The optical circulator is attached to the substrate and connected optically to the active part.

US Patent:

7043101, May 9, 2006

Filed:

Jul 10, 2003

Appl. No.:

10/617007

Inventors:

Yonglin Huang - Milpitas CA, US
James Xu - Fremont CA, US
Jian Lui - Sunnyvale CA, US
Liren Du - San Jose CA, US
Zheng Wang - San Jose CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

G02B 6/00

US Classification:

385 11, 385 15, 359494

Abstract:

An optical pumping module for use in optical amplifiers in fiber-optic communication. The pump module integrates laser diodes and a polarization beam combiner (PBC). The laser diodes and PBC may be attached to a substrate. The laser diodes may be formed onto the substrate either monolithically or by attaching discrete components to the substrate. The PBC may include isolation to prevent reflections back into the laser diodes.

US Patent:

7236700, Jun 26, 2007

Filed:

Oct 11, 2002

Appl. No.:

10/269176

Inventors:

Jian Liu - Mountain View CA, US
Zheng Wang - San Jose CA, US
Xuejun Lu - Fremont CA, US
Yonglin Huang - Milpitas CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H04J 14/06

US Classification:

398 61

Abstract:

Erbium doped fiber amplifiers for dense wavelength division multiplexed (DWDM) metro area optical networks may be configured as either high gain amplifiers or power amplifiers. The erbium doped fiber type, length, and pump power level are selected so that the shape of the gain spectra is approximately the same for single channel or multi-channel operation. In one embodiment, the same erbium doped fiber type and length is used for both power amplifiers and high gain amplifiers, reducing manufacturing costs.

US Patent:

7274510, Sep 25, 2007

Filed:

Mar 13, 2003

Appl. No.:

10/387648

Inventors:

Zheng Wang - San Jose CA, US
Qi Deng - Cupertino CA, US
Yonglin Huang - Milpitas CA, US
Frank Levinson - Palo Alto CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

G02B 5/30
G02B 27/28

US Classification:

359495, 359494, 359497

Abstract:

System and techniques for reducing the polarization dependency of an optical component by combining the actions of a circulator and a polarization beam combiner to separate an optical signal into a plurality of orthogonally oriented polarization components; rotate at least one of the components so that the polarization orientation of the components are parallel; propagate the components through respective input ports of an optical component at substantially the same time; rotate at least one of a plurality of output components from the optical component so that the polarization orientation of the output components are orthogonal; and recombine the plurality of output components into an output optical signal.

US Patent:

7440171, Oct 21, 2008

Filed:

Mar 7, 2003

Appl. No.:

10/384227

Inventors:

Jian Liu - Sunnyvale CA, US
Zheng Wang - San Jose CA, US
Yonglin Huang - Milpitas CA, US
Xuejun Lu - Fremont CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H01S 4/00
H04B 10/12

US Classification:

3593373, 3593374

Abstract:

An optical amplifier utilizes two or more doped fiber segments or portions to achieve a lower noise figure and a higher saturation power than would be possible using any one of the doped fiber segments. Each doped fiber portion may be considered to be a doped fiber optical amplifier, and has a different doping level than each of the other doped fiber portions. Each such doped fiber portion has distinct amplitude gain and noise characteristics relative to each of the other doped fiber potions. The two or more doped fiber portions are coupled to each other in series and most often in a predefined order based on their relative amplitude gain, noise and saturation power characteristics.

US Patent:

8050308, Nov 1, 2011

Filed:

Jan 23, 2003

Appl. No.:

10/351620

Inventors:

Jan Lipson - Cupertino CA, US
Zheng Wang - San Jose CA, US
Mina Farr - Palo Alto CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H01S 3/08

US Classification:

372108, 372101, 372102, 372 501, 372 5023, 359 16

Abstract:

A means for optically coupling a semiconductor laser to an optical fiber is disclosed. In one embodiment, a volume phase holographic element is disposed on a light-emitting surface of a semiconductor laser. The volume phase holographic element acts as an aberration-corrector for a lens that is disposed between the semiconductor laser and the optical fiber. In this way, an inexpensive lens that is not aberration free can be used. In some embodiments, the volume phase holographic element converts a Gaussian light beam emitted by the semiconductor laser into an annular beam that is more suitable for long distance transmission in multimode fibers.