Chun F He

US Patent:

6894846, May 17, 2005

Filed:

Oct 30, 2003

Appl. No.:

10/698176

Inventors:

Chun He - Fremont CA, US
Steven Zhu - Fremont CA, US

Assignee:

Alliance Fiber Optic Products - Sunnyvale CA

International Classification:

G02B013/00

US Classification:

359722, 359653

Abstract:

New designs of optical devices, particularly for adding or dropping a selected wavelength or a group of wavelengths are disclosed. In one embodiment, an optical filter is positioned a distance from a first lens to form an assembly with a mechanical axis. The optical filter is configured at a selected wavelength and reflecting light beams at wavelengths other than the selected wavelength and transmitting a light beam at the selected wavelength. The distance is obtained with respect to a reflection measurement of a light beam at a wavelength other than the selected wavelength such that the reflection measurement is minimized. A second lens is initially positioned towards the optical filter. Before being fixed with respect to the assembly, the second lens is laterally shifted from the mechanical axis of the assembly to collect with a minimum loss a light beam refracted from the assembly. Such lateral shift also benefits when a light beam comes out from the second lens.

US Patent:

7013069, Mar 14, 2006

Filed:

Jul 6, 2004

Appl. No.:

10/885252

Inventors:

Chun He - Fremont CA, US
Yao Li - Fremont CA, US
Andy Zhou - Fremont CA, US

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B 6/32
G02B 6/42

US Classification:

385 47, 385 33, 385 93, 398139

Abstract:

Designs of optical devices particularly useful for separating channels signals that are originally multiplexed are disclosed. In accordance with one design, an optical filter configured to reflect a particular channel signal is positioned to receive a multiplexed signal at a small incident angle so as to minimize residuals of other signals in the channel signal. To further increase isolation from the other channel signals, another filter is introduced to transmit only the reflected channel signal, the another filter has a frequency response reciprocal to that of the original optical filter. One of the key advantages, benefits and objects of the designs is to increase channel signals separation efficiency by increasing isolation among separated channel signals.

US Patent:

7103246, Sep 5, 2006

Filed:

Aug 7, 2004

Appl. No.:

10/913938

Inventors:

Steven Zhu - Fremont CA, US
Chun He - Fremont CA, US
Yao Li - Fremont CA, US

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B 6/32

US Classification:

385 34, 385 33

Abstract:

Techniques for designing optical couplers are disclosed. According to one aspect of the optical couplers, different from the prior art couplers, a holding tube (a sub-assembly) for holding an optical lens (e. g. , a GRIN lens) and an optical filter (e. g. , a thin film filter) is formed by concatenating two single tubes, one for accommodating the optical lens and the other for accommodating the optical filter. The two tubes are not required to have an identical dimension. As a result, inherent flexibilities are provided in the holding tube, especially the optical filter often comes in different sizes. Further, when the sub-assembly is inserted in a sleeve, only either one of the two tubes is secured to the sleeve so as to reduce a risk that, during a thermal condition change, any metal and glass material expansion will not cause the sub-assembly to be under stress that would otherwise be present when both of the tubes are secured to the sleeve. To reduce stress-related optical loss of the optical couplers, an epoxy adhesive is applied onto only a portion of an optical lens and a portion of a tube.

US Patent:

7212343, May 1, 2007

Filed:

Jul 11, 2003

Appl. No.:

10/618272

Inventors:

Chun He - Fremont CA, US
Yao Li - Fremont CA, US

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

G02B 27/10

US Classification:

359618, 359619

Abstract:

Designs of multiplexing/demultiplexing modules configured for N channels are disclosed. One of the features in the designs is to provide at least one concave mirror for compenstating filter tilting errors. The concave mirrors is placed where an incident traveling distance of a light beam is substantially similar or equal to the reflected traveling distance of the beam such that the filter tilting errors successively introduced over a number of optical filters can be successively reduced, compensated or removed over a subsequent number of optical filters as the light beams travels.

US Patent:

7223026, May 29, 2007

Filed:

May 12, 2005

Appl. No.:

11/127951

Inventors:

Chun He - Fremont CA, US
Steven Zhu - Fremont CA, US
Chuying Chen - Fremont CA, US

International Classification:

G02B 6/36

US Classification:

385 91

Abstract:

Techniques for packaging in an optical device and an opto-electrical conversion device are disclosed. According to one aspect of the techniques, the optical device is packaged in a piece of tubing and the opto-electrical conversion device is packaged in a TO-can. While the optical device and the opto-electrical conversion device are coaxially aligned, the tube and the TO-can are integrated by a certain amount of epoxy that is later cured by a UV light or heat. As a result, an integrated optical device is formed and enjoys features of small footprint, better alignment, enhanced impact performance, lower cost in addition to easier manufacturing process and environmental-safe.

US Patent:

7262904, Aug 28, 2007

Filed:

Dec 15, 2003

Appl. No.:

10/736008

Inventors:

Chun He - Fremont CA, US
Frank Wu - Fremont CA, US
Christine Luochanghong Lee - Sunnyvale CA, US
Yao Li - Fremont CA, US
Wei-Shin Tsay - Saratoga CA, US

Assignee:

Alliance Fiber Optic Products, Inc. - Sunnyvale CA

International Classification:

H01S 3/00
G02B 6/42
H04J 14/02

US Classification:

3593372, 385 18, 398 82, 398 85

Abstract:

Improved designs of optical devices for processing optical signals with one or more specified wavelengths are disclosed. According to embodiment, a filter mirror assembly appears an “L” shape and provides a filtering function as well as a reflecting function. The filter mirror assembly is so mounted that a rotation thereof will not alter the optical path the beam positions of signals resulted from a rotation of the filter mirror assembly. To cancel or minimize a lateral shift introduced to a light beam going through an optical filter, an optical compensator is introduced and rotates oppositely whenever the optical filter rotates.

US Patent:

20170085052, Mar 23, 2017

Filed:

Nov 29, 2016

Appl. No.:

15/530060

Inventors:

- Ronkonkoma NY, US
Chun He - Fremont CA, US

International Classification:

H01S 3/067
G02B 27/28
H01S 3/094
H01S 3/00

Abstract:

A multipass fiber amplifier comprises a micro-optic-module polarization separating device including a first ASE blocking device, a micro-optic-module 90 polarization rotating reflector including a second ASE blocking device, a pump source for providing pump light; a micro-optic-module wavelength-division multiplexer (WDM) for combining the pump light and the laser beam; and a gain fiber having a first end and a second end for amplifying the laser beam using the pump light, where the first ASE blocking device is coupled to the first end of the gain fiber and the second ASE blocking device is coupled to the second end of the gain fiber.

US Patent:

20160276798, Sep 22, 2016

Filed:

Mar 18, 2015

Appl. No.:

14/545033

Inventors:

- Ronkonkoma NY, US
Chun He - Fremont CA, US

International Classification:

H01S 3/091
H01S 3/16
H01S 3/10
H01S 3/067

Abstract:

A fiber coupled modular laser system comprises a laser oscillator, at least one fiber pre-amplifier, and at least one free space solid state power amplifier. The output of the laser oscillator is fiber coupled with the input of the at least one fiber pre-amplifier or the at least one free space solid state power amplifier. The output or the input of the at least one fiber pre-amplifier is fiber coupled with the input or the output of the at least one free space solid state power amplifier.