Jian Gang Liu, 583085 Via E #Rosso, Ontario, CA 91764

6845108, Jan 18, 2005

May 14, 2002

10/146653

Jian Liu - Mountain View CA, US
Yue Chen - Palo Alto CA, US
Zheng Yan - San Jose CA, US
Hong Lin - Palo Alto CA, US

Calmar Optcom, Inc. - Sunnyvale CA

H01S 310

372 20, 372 26, 372 2901, 372 2902

Techniques and designs for tunable and dynamically stabilized a laser wavelength in various lasers, including fiber lasers and actively mode-locked lasers. In an actively mode-locked laser, a dynamic wavelength tuning control and a dynamic cavity length control are implemented to maintain mode locking during tuning of the laser wavelength.

6850526, Feb 1, 2005

Jul 6, 2001

09/900307

Zhenping Tan - San Jose CA, US
Zheng Liu - Saratoga CA, US
Jian Liu - Livermore CA, US
Ronald P. Novick - Orange CT, US

TranSwitch Corporation - Shelton CT

H04L 1228
H04J 316
H04J 324

3703956, 370413, 370469, 370474

Methods and apparatus for extending the transmission range of a UTOPIA ATM (or packet) interface include providing two UTOPIA extension devices, one for coupling a PHY layer device to a transmission cloud and one for coupling an ATM layer (or LINK layer) device to the transmission cloud. Each device includes a UTOPIA interface emulator, a link controller, and a media transceiver. The media transceiver can be made to support various media such as a backplane, copper cable, optical fiber, or a wireless medium. The UTOPIA extension device preferably includes a UTOPIA inlet buffer, a UTOPIA outlet buffer, an inlet clock decoupling buffer, an outlet clock decoupling buffer, and a flow control module. The UTOPIA inlet and outlet buffers are used for traffic management and the clock decoupling buffers allow the UTOPIA interface emulator and the link controller to operate in different clock domains. The link controller provides error control and backpressure delivery to support flow control.

6927845, Aug 9, 2005

Nov 4, 2002

10/288353

Jian Liu - Mountain View CA, US

G01N021/00

356 731

A method is disclosed in this invention for designing an optical polarization analyzer for measuring a state of polarization (SOP) of an optical signal transmitted over a particular range of wavelengths. The method includes a step of selecting a corner cube having a specific input medium refraction index and comprising four triangular surfaces and attaching four optical detectors on each of the four surfaces for sequentially absorbing and then reflecting an incident light from one detector to a next detector wherein said incident light is within the particular range of wavelengths. The method further includes a step of selecting a coating to coat over each of the detectors disposed on each of the four surfaces by selecting a coating material and designing an accurately controlled thickness of each of the coatings for controlling a absorption/reflectance ratio for each of the detectors whereby an optimal sensitivity of photopolarimeter is achieved.

6987905, Jan 17, 2006

Dec 2, 2003

10/725804

Yonglin Huang - Milpitas CA, US
Jian Liu - Sunnyvale CA, US
Qi Deng - Cuperino CA, US
Liren Du - San Jose CA, US
Steve Wang - San Jose CA, US

Finisar Corporation - Sunnyvale CA

G02B 6/26

385 27, 385 33, 372 45

A gain flattening and tap device. A gain flattening filter for use in fiber-optic communications includes a substrate. A GFF film is formed on a first surface of the substrate. An HR film is formed on a second surface of the substrate. The HR film is arranged to receive light from the GFF film and to reflect at least some of the light back through the GFF film. By passing the light through the GFF film multiple times, the effectiveness of the GFF film is multiplied. Further, by constructing the HR film to allow portions of the light to pass through, a tap may be implemented with the GFF.

7031051, Apr 18, 2006

Mar 7, 2003

10/384228

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

Finisar Corporation - Sunnyvale CA

H04B 10/12

3593412, 35934132, 398135

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.

7236700, Jun 26, 2007

Oct 11, 2002

10/269176

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

Finisar Corporation - Sunnyvale CA

H04J 14/06

398 61

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.

7256930, Aug 14, 2007

Apr 15, 2004

10/825746

Jian Liu - Sunnyvale CA, US

H04B 10/12

3593371

An amplified laser source for amplifying a laser projection that includes a diode laser source modulated by a pulse generator applying an alternate high and low voltages higher and lower than a threshold voltage for projecting a modulated optical signal. The laser source further includes a first erbium-doped fiber (EDF) for amplifying the modulated optical signal. The laser source further includes a set of Bragg gratings for receiving the modulated optical signal from the first EDF for reflecting a grating-specific pulse-distortion-reduced optical signal. The laser source further includes an electro-absorption (EA) modulator synchronized with the pulse generator for increasing an extinction ratio of the optical signals. The laser source further includes a second erbium doped fiber (EDF) for receiving and amplifying the optical signal from the EA modulator wherein the second erbium doped fiber (EDF) having a length of several meters and a diameter greater than or equal to thirty-five micrometers.

7430224, Sep 30, 2008

Aug 29, 2006

11/512898

Jian Liu - Sunnyvale CA, US
Jiangfan Xia - Santa Clara CA, US

PolarOnyx, Inc. - Sunnyvale CA

H01S 3/30

372 6, 372 18, 372700

A fiber Chirped Pulse Amplification (CPA) laser system includes a fiber mode-locking oscillator for generating a laser for projecting to a fiber stretcher for stretching a pulse width of the laser wherein the stretcher further comprising a Photonic Bandgap (PBG) fiber having a lower nonlinearity and an abnormal dispersion than a solid core fiber for connecting and transmitting a laser from the stretcher to a multistage amplifier for amplifying the laser into an output laser whereby a separate compressor is not required.