Filter module
AssigneeNippon Sheet Glass Co., Ltd.
InventorsHiroyuki Tanaka, Akimitsu Sato, Takeshi Ishimaru, Takashi Fukuzawa
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Abstract
A filter module includes a first optical fiber collimator, a second optical fiber collimator, and a filter located between the first and second optical fiber collimators. 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. The second optical fiber collimator includes second optical fibers, a second optical fiber chip for holding the second optical fiber, and a second lens. The filter is located between and coaxial with the first and second lenses. The filter, the first lens, and the second lens form a center piece of the filter module.
Claims21
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;
- and
- wherein the filter is located between and coaxial with the first and second lenses, and wherein the filter, the first lens, and the second lens form a center piece of the filter module.
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 rod 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 rod lens;
- wherein the filter is located between and coaxial with the first and second rod lenses and is fixed to the second rod lens, and wherein the filter, the first rod lens, and the second rod lens form a center piece of the filter module;
- wherein the first and second rod lenses each have an optical axis and a slant end, the slant end being inclined relative to the optical axis by a predetermined angle, and wherein each of the first and second rod lenses is provided with a mark used for matching the phases of the slant ends;
- and
- wherein the first optical fiber comprises a single optical fiber, and wherein the second optical fiber comprises two optical fibers.
A method for manufacturing a filter module, comprising:
- inserting a first rod lens to a first lens holder and fixing the first rod lens to the first lens holder with adhesive;
- inserting a second rod lens to a second lens holder and fixing the second rod lens to the second lens holder with adhesive;
- fitting the first lens holder to the second lens holder, and matching the phases of slant ends of the first and second rod lenses by rotating the first and second lens holders relative to each other about the axes;
- adjusting the distance between the first and second rod lenses;
- completing a center piece by fixing the first and second lens holders to each other;
- and
- adjusting the positions of optical fiber chips relative to the center piece and fixing the optical fiber chips to the center piece.
Dependencies are inferred from the claim text.