Peter S Chang

US Patent:

6396980, May 28, 2002

Filed:

Jan 21, 2000

Appl. No.:

09/488937

Inventors:

Yuqiao Liu - Sunnyvale CA
Gaofeng Chen - Sunnyvale CA
Peter C. Chang - Mountain View CA

Assignee:

Alliance Fiber Optics Products, Inc. - Sunnyvale CA

International Classification:

G02B 626

US Classification:

385 34, 385 31, 385 33, 385 24, 385 52, 385 92, 385 93, 385 65, 385 72, 385 73, 385 83, 359124, 359131

Abstract:

A multi-port fiber optic device ( ) includes a dual fiber first collimator ( ) which comprises a ferrule ( ) with the input fiber ( ) and the output fiber ( ) therein, a gradient index rod lens ( ) adhesively attached to the ferrule ( ), and a filter ( ) adhesively attached to the lens ( ) opposite to the ferrule ( ). A second collimator ( ) is generally positioned in front of the first collimator ( ), includes the similar components thereof while being symmetrical to the first collimator ( ) along the middle portion of the whole assembly, except that one of the dual fiber of the second collimator ( ) functions idle, thus the pigtail of such a fiber being removed.

US Patent:

6400862, Jun 4, 2002

Filed:

May 23, 2000

Appl. No.:

09/576758

Inventors:

Yuqiao Liu - Sunnyvale CA
Peter C. Chang - Mountain View CA

Assignee:

Alliance Fiber Optics Products, Inc. - Sunnyvale CA

International Classification:

G02B 628

US Classification:

385 24, 385 33

Abstract:

A retro-reflective multi-port fiber optic device ( ) includes the triple-fiber ferrule ( ) with a GRIN rod lens ( ) to couple the light. The triple-fiber ferrule ( ) with three fibers ( ) thereof is attached to the angled facet of the GRIN rod lens ( ) and the WDM filter ( ) is attached to the opposite side of the lens ( ). A reflective mirror ( ) is attached next to the other side of the WDM filter ( ) opposite to the lens ( ) after alignment. The triple-fiber ferrule ( ) is used to couple light in and out of the device, and tune the thin film filter center wavelength to the desired ITU grid. Therefore, the coupled-in light from the common input pigtail fiber ( ) of the triple-fiber ferrule ( ) will be collimated and transmitted unto the WDM filter ( ) wherein the part of the in-pass-band light with regard to the WDM filter ( ) will transmit through the WDM filter ( ), and then successively retro-reflect back by the mirror ( ) and further transmit through the WDM band-pass filter ( ) again. The retro-reflected in-pass-band signal is then coupled into one retro-reflective transmission output fiber/port ( ) of the triple-fiber ferrule ( ) as a demultiplexed channel. On the other hand, the out-pass-band light with regard to the WDM filter will not transmit through the WDM filter ( ) to interact with the mirror ( ), but instead be directly reflected back by the WDM filter ( ) and coupled into a reflection output fiber/port ( ) of the triple-fiber ferrule ( ) to be transmitted to the next stage for further demultiplexing other channels.

US Patent:

6407843, Jun 18, 2002

Filed:

Nov 28, 2000

Appl. No.:

09/728376

Inventors:

Michael W. Rowan - Los Gatos CA
Peter Chang - San Jose CA
James F. Coward - San Francisco CA
Roger R. Taur - Honolulu HI
Stuart Wilson - Menlo Park CA
Ting K. Yee - Foster City CA

Assignee:

Kestrel Solutions, Inc. - Mountain View CA

International Classification:

H04B 1000

US Classification:

359189

Abstract:

A system transmits digital data over an optical fiber at high aggregate data rates and high bandwidth efficiencies. The system includes a modulation stage, a frequency division multiplexer, and an optical modulator. The modulation stage QAM-modulates a plurality of incoming digital data channels. The frequency division multiplexer combines the QAM-modulated signals by frequency division multiplexing them into an RF signal. The optical modulator uses the RF signal to modulate an optical carrier for transmission over an optical fiber.

US Patent:

6493131, Dec 10, 2002

Filed:

Dec 20, 2000

Appl. No.:

09/746370

Inventors:

Shin-Sheng Tarng - San Jose CA
Slava Yazhgur - Daly City CA
Ting K. Yee - Foster City CA
Peter H. Chang - San Jose CA

Assignee:

Kestrel Solutions, Inc. - Mountain View CA

International Classification:

G02F 202

US Classification:

359326, 359191, 359240, 372 32

Abstract:

A device is used to wavelength lock two optical signals to some frequency offset. A photomixer section produces a frequency test signal from the beat component of the two optical signals. The frequency of the frequency test signal reflects whether the actual frequency offset of the two optical signals equals the desired offset. A frequency filter with a monotonically varying transfer function is used to filter the frequency test signal. Thus, different gains are applied to different frequencies. Comparison circuitry uses the filtered signal to determine whether the frequency filter applied the gain which corresponds to the desired frequency offset and generates a corresponding error signal.

US Patent:

6498876, Dec 24, 2002

Filed:

May 23, 2000

Appl. No.:

09/577200

Inventors:

Yuqiao Liu - Sunnyvale CA
Peter C. Chang - Mountain View CA

Assignee:

Alliance Fiber Optics Products, Inc. - Sunnyvale CA

International Classification:

G02B 632

US Classification:

385 34, 385 24, 385 33, 385 65, 359124, 359131

Abstract:

A multi-port fiber optic device ( ) includes a pair of opposite collimators ( ), of which each includes a V-groove dual fiber ferrule ( ) with a GRIN rod lens ( ). At least one band-pass DWDM thin film filter ( ) is securely sandwiched between the two opposite GRIN rod lens ( ) of the pair of collimators ( ). The V-groove dual fiber ferrule ( ) is used to couple light in and out thereof and tune the thin film filter center wavelength to the ITU grid. The light coupled in from the input fiber ( ) of the V-groove dual fiber ferrule ( ) will be collimated and transmitted to the DWDM thin film filter ( ). The part of the in-pass-band light will pass through the filter ( ) as performing a demultiplexed channel and is successively coupled into the other collimator ( ) aside.

US Patent:

6529303, Mar 4, 2003

Filed:

Sep 24, 1999

Appl. No.:

09/405367

Inventors:

Michael W. Rowan - Los Gatos CA
David B. Upham - Sunnyvale CA
Augustus Elmer - San Jose CA
Laurence J. Newell - Saratoga CA
David A. Pechner - San Jose CA
Abraham Kou - San Jose CA
James F. Coward - La Honda CA
Norman L. Swenson - Mountain View CA
Minnie Ho - Palo Alto CA
Peter H. Chang - San Jose CA
Ting K. Yee - Foster City CA
Stuart E. Wilson - Menlo Park CA

Assignee:

Kestrel Solutions, Inc. - Mountain View CA

International Classification:

H04J 1402

US Classification:

359128, 359127, 359189, 370480

Abstract:

A frequency division multiplexing (FDM) node used in optical communications networks provides add-drop multiplexing (ADM) functionality between optical high-speed channels and electrical low-speed channels. The FDM node includes a high-speed system and an ADM crosspoint. The high-speed system converts between an optical high-speed channel and its constituent electrical low-speed channels through the use of frequency division multiplexing and preferably also QAM modulation. The ADM crosspoint couples incoming low-speed channels to outgoing low-speed channels, thus implementing the ADM functionality for the FDM node.

US Patent:

6532325, Mar 11, 2003

Filed:

Dec 9, 2000

Appl. No.:

09/736002

Inventors:

Yugiao Liu - Sunnyvale CA
Peter C. Chang - Mountain View CA

Assignee:

Alliance Fiber Optics Products, Inc. - Sunnyvale CA

International Classification:

G02B 632

US Classification:

385 34, 385 24, 385 65, 359124, 359131

Abstract:

A V-groove dual fiber DWDM collimator ( ) including an optical lens ( ) and a V-groove dual fiber ferrule means ( ) fixed with each other. The ferrule means ( ) includes a V-groove chip ( ) and a cover chip ( ) commonly enclosed by a protective guiding sleeve ( ) wherein two pigtail fibers ( ) are respectively received within the corresponding grooves ( ) of the V-groove chip ( ). The V-groove ferrule means ( ) is itself fixed by adhering its own internal components ( ) and the embedded fibers ( ), and also fixed to the lens ( ).

US Patent:

6535668, Mar 18, 2003

Filed:

Mar 26, 2001

Appl. No.:

09/817938

Inventors:

Yuqiao Liu - Sunnyvale CA
Peter C. Chang - Mountain View CA
Wei-Shin Tsay - Saratoga CA

Assignee:

Alliance Fiber Optics Products, Inc. - Sunnyvale CA

International Classification:

G02B 632

US Classification:

385 33, 385 24, 385 27, 385 34, 385 78, 385 83, 359127, 359128

Abstract:

A retro-reflective multi-port fiber optic device includes the triple-fiber ferrule with a GRIN rod lens to couple the light. The triple-fiber ferrule with three fibers thereof is attached to the angled facet of the GRIN rod lens and the WDM filter is attached to the opposite side of the lens. A reflective mirror is aligned with and attached next to the other side of the WDM filter opposite to the lens. The triple-fiber ferrule, which is specifically selected from adense series of triple-fiber ferrules respectively defining three-fiber assemblies with different fiber spacings, is used to couple light in and out of the device, and tune the filter center wavelength to the desired ITU grid.