Wei J Qiu

US Patent:

20040086219, May 6, 2004

Filed:

Nov 6, 2002

Appl. No.:

10/290061

Inventors:

Wei Qiu - Gardena CA, US
Zhanxiang Zhang - San Jose CA, US
Jianmin Gao - San Jose CA, US
Dong Xu - San Jose CA, US

International Classification:

G02B006/35

US Classification:

385/021000, 385/018000

Abstract:

A planar 2×2 switch is provided for controllably coupling optical channels, the switch has a reflector which is movable between a first and a second position. The reflector in the first position is disposed such that it reflects the optical signal into the second output channel. The optical signal from first input channel is coupled into second output fiber. The optical signal from second input fiber is coupled into first output fiber. The reflector in the second position is disposed such that the input optical signal propagates to a second reflector and is reflected and refocused into the output fiber. The reflection direction from the second reflector introduces a double reflection by utilizing two planar reflectors. The optical signal from first input channel is reflected into first output channel. The optical signal from second input channel will be coupled into second output channel.

US Patent:

20040086221, May 6, 2004

Filed:

Nov 6, 2002

Appl. No.:

10/290098

Inventors:

Wei Qiu - Gardena CA, US
Zhanxiang Zhang - San Jose CA, US
Jianmin Gao - San Jose CA, US
Dong Xu - San Jose CA, US

International Classification:

G02B006/293

US Classification:

385/024000

Abstract:

A first embodiment of the present invention provides a dense wavelength division multiplexer which has a planar array of input optical channels, each channel capable of receiving an optical signal. Coupled to this planar array of input channels is a first waveguide concentrator which facilitates the reduction of the spacing between the cores of the input optical channels. A first collimating provides means for transforming the optical signals into a collimated beam. A wavelength dependent element is disposed proximate the first collimating means. A second collimating means refocuses the collimated beam into an optical channel in a second waveguide concentrator, which facilitates the expansion of the spacing between the cores of the output channels, and ultimately to an array of output optical channels.

US Patent:

20070136812, Jun 14, 2007

Filed:

Oct 28, 2006

Appl. No.:

11/554002

Inventors:

Wei Qiu - Los Angeles CA, US

International Classification:

G06F 12/14

US Classification:

726024000

Abstract:

A virus preventive system detects computer viruses by file pattern verification mechanism. It registers an original file pattern which is permitted to be accessed into the Verification Data Base. Registration of a file occurs before it is executed, which allows confirming if the file has been falsified. The Verification Data Base will be verified automatically by the Verification Client, which is served by the Verification Server. Consequently the present invention vouches for the validity of files so that it prevents the invasion of new computer viruses even though there is no knowledge about the viruses or malicious programs. Therefore, the present invention is able to prevent damage from all malicious computer programs beforehand.