Structure and method for multi-ports optical apparatus

Details Structure and method for multi-ports optical apparatus Structure and method for multi-ports optical apparatus

2007-01-30

2007-01-30

Lee, John D. (Department: 2874)

Optical waveguides

With optical coupler

Plural

C385S034000, C398S085000, C398S088000

Reexamination Certificate

active

11247052

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.

REFERENCES:
patent: 6792211 (2004-09-01), Chang et al.

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