Christopher H Lin

US Patent:

8064036, Nov 22, 2011

Filed:

Apr 30, 2009

Appl. No.:

12/433769

Inventors:

Xuefeng Yue - San Jose CA, US
Christopher Lin - El Cerrito CA, US
Ruipeng Sun - Pleasanton CA, US
Ruibo Wang - Oak Park CA, US

Assignee:

Oclaro (North America), Inc. - San Jose CA

International Classification:

G02B 6/35
G02F 1/13

US Classification:

349196, 349193, 385 16, 385 18, 385 22, 385140

Abstract:

An optical device has the structure to perform switching and attenuation of an optical beam with reduced polarization dependent loss (PDL). The optical device includes a birefringent displacer and two liquid crystal (LC) structures. The first LC structure is used to condition s-polarized components of the optical beam and the second LC structure is used to condition p-polarized components of the optical beam. Each LC structure has a separate control electrode so that the s-polarized components of the optical beam and the p-polarized components of the optical beam can be conditioned differently and in such a manner that reduces PDL. The optical device may be configured for processing multiple input light beams, such as the multiple wavelength channels de-multiplexed from a wavelength division multiplexed (WDM) optical signal.

US Patent:

8094982, Jan 10, 2012

Filed:

Jan 15, 2008

Appl. No.:

12/014728

Inventors:

Xuehua Wu - Union City CA, US
Haijun Yuan - Pleasanton CA, US
Younsheng Liu - San Jose CA, US
Christopher Lin - El Cerrito CA, US
Giovanni Barbarossa - Saratoga CA, US

Assignee:

Oclaro (North America), Inc. - San Jose CA

International Classification:

G02B 6/32
G02B 6/42

US Classification:

385 33, 385 31

Abstract:

A fiber lens assembly is configured to optically couple an optical fiber to a signal processing device having free-space optical elements. The fiber lens assembly includes a diverging lens having a focal length that may be around 2 to 6 times the diameter of the optical fiber core. Sensitivity of the fiber lens assembly to angular misalignment and positional displacement is reduced by coupling the optical fiber to the signal processing device using a diverging lens rather than a collimating lens, and by configuring the diverging lens with a suitable focal length.

US Patent:

8203691, Jun 19, 2012

Filed:

Jan 15, 2008

Appl. No.:

12/014730

Inventors:

Haijun Yuan - Pleasanton CA, US
Xuehua Wu - Union City CA, US
Christopher Lin - El Cerrito CA, US
Giovanni Barbarossa - Saratoga CA, US

Assignee:

Oclaro (North America), Inc. - San Jose CA

International Classification:

G02F 1/13
G02B 27/28

US Classification:

349196, 349 96, 349117, 35948406, 35948908

Abstract:

An optical switch for performing high extinction ratio switching of an optical signal includes a beam polarizing element and one or more optical elements. The optical elements are configured to direct an optical signal along a first or second optical path based on the polarization state of the optical signal as it passes through the optical elements. The optical switch performs high extinction ratio switching of the optical signal by preventing unwanted optical energy from entering an output port by using an absorptive or reflective optical element or by directing the unwanted optical energy along a different optical path.

US Patent:

8346084, Jan 1, 2013

Filed:

Nov 27, 2007

Appl. No.:

11/945996

Inventors:

Haijun Yuan - Pleasanton CA, US
Xuehua Wu - Union City CA, US
Christopher Lin - El Cerrito CA, US
Giovanni Barbarossa - Saratoga CA, US

Assignee:

Oclaro (North America), Inc. - San Jose CA

International Classification:

H04J 14/02

US Classification:

398 79, 398 45, 398 82, 398 87, 398 88

Abstract:

An optical device for a wavelength division multiplexing system has a telecentric lens system and a signal-processing optical element, where the signal-processing optical element performs switching, attenuation, or other optical signal processing for the optical device. The telecentric lens system acts as a self-compensating optical system to minimize sensitivity of the optical device to unwanted displacement of an input image from the optical axis of the optical device. The optical device may include multiple telecentric lens systems, in which case the optical device is also less sensitive to precise alignment between the telecentric lens systems.

US Patent:

8358398, Jan 22, 2013

Filed:

Jan 19, 2009

Appl. No.:

12/356038

Inventors:

Xuehua Wu - Union City CA, US
Haijun Yuan - Pleasanton CA, US
Christopher Lin - El Cerrito CA, US
Giovanni Barbarossa - Saratoga CA, US

Assignee:

Oclaro (North America), Inc. - San Jose CA

International Classification:

G02F 1/13
G02F 1/1335
G02B 27/28

US Classification:

349193, 349 96, 349117, 35948908

Abstract:

An optical device is configured to perform both switching and attenuation of an optical beam in response to a single control signal. The optical device includes a liquid-crystal-based beam-polarizing element having polarization-conditioning regions that are controlled using a common electrode. The first polarization-conditioning region conditions the polarization of the input beam in order to separate the input beam into a primary component and a residual component. The second and third polarization-conditioning regions change the polarization of the primary component and the residual component, respectively. The primary component is directed to an output port after it has been attenuated based on its polarization state. The residual component, after passing through the third polarization-conditioning region, has its intensity further reduced based on its polarization state.

US Patent:

8605247, Dec 10, 2013

Filed:

May 31, 2012

Appl. No.:

13/485052

Inventors:

Haijun Yuan - Pleasanton CA, US
Xuehua Wu - Union City CA, US
Christopher Lin - El Cerrito CA, US
Giovanni Barbarossa - Saratoga CA, US

International Classification:

G02F 1/13
G02B 27/28

US Classification:

349196, 349 96, 349117, 35948406, 35948908

Abstract:

An optical switch for performing high extinction ratio switching of an optical signal includes a beam polarizing element and one or more optical elements. The optical elements are configured to direct an optical signal along a first or second optical path based on the polarization state of the optical signal as it passes through the optical elements. The optical switch performs high extinction ratio switching of the optical signal by preventing unwanted optical energy from entering an output port by using an absorptive or reflective optical element or by directing the unwanted optical energy along a different optical path.

US Patent:

20080219663, Sep 11, 2008

Filed:

Jan 15, 2008

Appl. No.:

12/014736

Inventors:

Haijun Yuan - Pleasanton CA, US
Xuehua Wu - Union City CA, US
Christopher Lin - El Cerrito CA, US
Giovanni Barbarossa - Saratoga CA, US

International Classification:

H04J 14/02

US Classification:

398 48

Abstract:

An optical switching device for wavelength divisional multiplexed signals uses cascaded arrays of optical steering devices for 1×N routing of WDM optical signals, where N=4, 8, 16, etc. Two cascaded arrays provide 1×4 switching; three cascaded arrays provide 1×8 switching; and so on. Each array is configured with independently controlled optical steering devices so that each wavelength channel of the WDM signal may be routed to any of N output ports. The optical steering devices may be micro-mirrors, liquid crystal-based polarization modulators, or a combination of both. By incorporating cascaded optical steering devices into a single WDM switching device, cost effective 1×N switching of WDM optical signals may be realized.

US Patent:

20130101254, Apr 25, 2013

Filed:

Oct 25, 2011

Appl. No.:

13/281178

Inventors:

Ming Cai - Fremont CA, US
Christopher Lin - Washington DC, US

International Classification:

G02B 6/42

US Classification:

385 47

Abstract:

An optical performance monitoring system includes a four-port tap coupling a tunable optical filter to a light detector. The four-port tap is configured as an optical tap and an optical splitter combined into a single optical element, where the optical tap directs a portion of an optical signal from an optical fiber to the tunable optical filter, and the optical splitter directs the optical signal from the tunable optical filter to the light detector. The optical performance monitoring system may employ tunable optical filters as a double-duty tunable filter or a double-pass tunable filter. As a double-duty tunable filter, optical signals to be monitored are passed through the tunable filter in opposite directions. As a double-pass tunable filter, a reflecting element is arranged on the output side of the tunable filter so that a filtered optical signal can be fed back into the tunable filter.