Jian Te He

US Patent:

7206466, Apr 17, 2007

Filed:

Oct 24, 2003

Appl. No.:

10/693774

Inventors:

Jian He - San Jose CA, US
Ping Xie - Cupertino CA, US
Chester Chien - San Jose CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

G02B 6/00

US Classification:

385 11, 359494, 359497, 398152, 398184

Abstract:

A system and method for reducing polarization dependent loss in optical circuits is disclosed. The system includes a first optical device having an output, and a polarization controller optically coupled to the first optical device for adjusting a polarization state of the output of the first optical device. The system further includes a second optical device optically coupled to the polarization controller. Adjusting the polarization state of the output of the first optical device alters a total polarization-dependent loss for the cascaded device system. A series of fiber optic loops can be used to adjust the output of the first optical device. A PDL measuring device can be inserted after the second optical device to provide feedback to the polarization controller, so that the controller may be tuned to adjust the polarization to a desired state.

US Patent:

7373028, May 13, 2008

Filed:

Oct 24, 2003

Appl. No.:

10/693613

Inventors:

Jian He - San Jose CA, US
Ping Xie - Cupertino CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

G02B 6/00

US Classification:

385 11, 385 27, 385 31

Abstract:

A polarization maintaining coupler is provided that allows a user to change the coupling ratio of two or more output fibers. The coupler can include an assembly containing a PM fiber in a ferrule. The ferrule is attached to a housing, which includes a lens for collimating light from the PM fiber onto an optical component that splits the incoming polarized light into two orthogonally polarized components. Each of these orthogonal components is then output into a separate PM or single mode fiber. By rotating the input PM fiber with respect to the optical component, the coupling ratio of the output fibers can be changed. This change in the coupling ratio can be accomplished either by rotating the input PM fiber, or by rotating the optical component together with the output fibers.

US Patent:

20140276672, Sep 18, 2014

Filed:

Mar 5, 2014

Appl. No.:

14/198319

Inventors:

- Santa Ana CA, US
Jian He - San Jose CA, US
Jiandong Xu - San Jose CA, US
Donald Simpson - Orange CA, US
Gennady Imeshev - Irvine CA, US
Oleg J. Korovyanko - Lake Forest CA, US
Zenon Witowski - Rancho Santa Margarita CA, US

International Classification:

A61F 9/008

US Classification:

606 4

Abstract:

Embodiments of this invention are directed to a laser system configured to deliver a pulsed laser beam to a patient's eye. The system includes a laser engine comprising an optically-pumped laser oscillator configured with an extracavity waveplate, and an optional intracavity waveplate, that can be tilted and rotated to provide a limited range of wavelengths for laser mode excitation and to maintain stable mode-locked laser operation. In an embodiment, the present design includes an oscillator and a photosensor, such as a fast photodetector or an autocorrelator, positioned to receive a beam of laser light associated with the oscillator or laser engine, and a controller configured to receive readings from the photosensor and alter the laser gain provided within the oscillator to a level outside the bistable performance zone avoiding mode and gain competitions.