| 摘要 |
Provided are an optical fiber ferrule holding a multiple of fibers and an optical coupler using the ferrule. A 4-core optical fiber ferrule according to the present invention is constructed such that optical fibers are inserted into and fixed in a terminal end hole of the ferrule 16 so that the respective ends of four uncovered optical fibers 21, 23, closely adjoining one another are exposed and the terminal end is polished into a surface slightly inclined by an angle .THETA. with respect to a surface perpendicular to the axis of the ferrule. The optical coupler comprises: first and second optical fiber ferrules each constructed as the above; first and second distributed refractive index optical lenses each having one end surface polished to have an inclination .THETA. with respect to the optical axis thereof; a mirror coating layer which reflects a portion of and transmits another portion of a light beam incident thereon; and a holding means for bringing the respective inclined surfaces of the first ferrule and the first distributed refractive index rod lens into close contact to each other, bringing the respective inclined surfaces of the second ferrule and the second distributed refractive index rod lens into close contact to each other, disposing the mirror coating layer between the first and second distributed refractive index lenses, and coaxially holding these components.
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