Patent ID: 7194160

Claim:
A filter module including a first optical fiber collimator, a second optical fiber collimator, and a filter located between the first and second optical fiber collimators: wherein the first optical fiber collimator includes a first optical fiber, a first optical fiber chip for holding the first optical fiber, and a first lens; wherein the second optical fiber collimator includes a second optical fiber, a second optical fiber chip for holding the second optical fiber, and a second lens; wherein the filter is located between and coaxial with the first and second lenses, and the filter, the first lens, and the second lens form a center piece of the filter module, in which the center piece holds the optical axes of facing lenses and the filter such that the optical axes are aligned, the facing lenses being the first and the second lenses, and the center piece being integrally formed of the filter and the facing lenses; wherein each of the first and second optical fiber chips includes a capillary for holding the corresponding optical fiber and a cylindrical capillary holder for holding the capillary, and wherein each capillary holder is adhered to the corresponding lens with adhesive; and wherein each capillary holder is provide with a recess, the recess being located between the capillary holder and the corresponding capillary, and the recess facing the corresponding lens.