Mingjun Zhao

US Patent:

7340130, Mar 4, 2008

Filed:

Oct 11, 2005

Appl. No.:

11/247779

Inventors:

Xuehua Wu - Union City CA, US
Mingjun Zhao - Fremont CA, US
John Feng - Union City CA, US

Assignee:

Avanex Corporation - Fremont CA

International Classification:

G02B 6/34

US Classification:

385 34, 385 33, 385 84

Abstract:

The present invention describes a structure and method for a multi-ports WDM device for compensating the filter distortion while reducing insertion loss. The multi-ports WDM device comprises a 4-fiber collimator having a grin lens and a 2-fiber collimator having a lens where the focal plane of the second lens is shorter than the focal plane of the first grin lens Ands with aspheric surface. When a light signal travels through the first lens in the 4-fiber collimator to a filter, the film on the filter causes distortion to the light signal resulting in a large insertion loss. To compensate for the insertion loss, the lens on the 2-fiber collimator has a aspheric function and a shorter focal plane than the grin lens on the 4-fiber collimator. The type of grin lens used in the 4-fiber collimator is different than the lens used in the 2-fiber collimator. Effectively, the lens in the 2-fiber collimator operates to de-focus a light signal relative to the grin lens in the 4-fiber collimator.

US Patent:

7454143, Nov 18, 2008

Filed:

Dec 15, 2003

Appl. No.:

10/736818

Inventors:

Xuehua Wu - Union City CA, US
Mingjun Zhao - Fremont CA, US
John Feng - Union City CA, US
Giovanni Barbarossa - Saratoga CA, US

Assignee:

Avanex Corporation - Fremont CA

International Classification:

H04J 14/02

US Classification:

398 85

Abstract:

A reconfigurable thin film based dense wavelength division multiplexing (DWDM) device is described for hitless switching of wavelengths by employing a reconfigurable filtering device. The reconfigurable filtering device is based on a mechanical switching of a filtering chip which has a thin film coated a first one-half of a first face for interference wavelength filtering and has a gold-mirror coated on a second one-half of the first face for high reflection.

US Patent:

7171073, Jan 30, 2007

Filed:

Oct 11, 2005

Appl. No.:

11/247052

Inventors:

Xuehua Wu - Union City CA, US
Mingjun Zhao - Fremont CA, US
John Feng - Union City CA, US

Assignee:

Avanex Corporation - Fremont CA

International Classification:

G02B 6/293
G02B 6/32
H04J 14/02

US Classification:

385 24, 385 34, 398 85, 398 88

Abstract:

The present invention describes a structure and method for a multi-ports WDM device for compensating the filter distortion while reducing insertion loss. The multi-ports WDM device comprises a 4-fiber collimator having a grin lens and a 2-fiber collimator having a lens where the focal plane of the second lens is shorter than the focal plane of the first grin lens Ands with aspheric surface. When a light signal travels through the first lens in the 4-fiber collimator to a filter, the film on the filter causes distortion to the light signal resulting in a large insertion loss. To compensate for the insertion loss, the lens on the 2-fiber collimator has a aspheric function and a shorter focal plane than the grin lens on the 4-fiber collimator. The type of grin lens used in the 4-fiber collimator is different than the lens used in the 2-fiber collimator. Effectively, the lens in the 2-fiber collimator operates to de-focus a light signal relative to the grin lens in the 4-fiber collimator.