Method for assembly of multi-ports optical apparatus

Details Method for assembly of multi-ports optical apparatus Method for assembly of multi-ports optical apparatus

2005-10-11

2008-03-04

Font, Frank G. (Department: 2883)

Optical waveguides

With optical coupler

Input/output coupler

C385S033000, C385S084000

Reexamination Certificate

active

07340130

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: 5555330 (1996-09-01), Pan et al.
patent: 7171073 (2007-01-01), Wu et al.
patent: 2002/0118920 (2002-08-01), Francis et al.
patent: 2002/0197020 (2002-12-01), Qian et al.
patent: 2003/0108297 (2003-06-01), Lee
patent: 2003/0185507 (2003-10-01), Lai et al.
patent: 2005/0008292 (2005-01-01), Wang et al.
patent: 2007/0127867 (2007-06-01), Jin et al.

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