| 摘要 |
The optical fiber connector of the invention includes two optical fibers facing to each other, in which one optical fiber of the two has a spherical end face, when the core diameter of the optical fiber having the spherical face is given by E1, the numerical aperture thereof by NA1, the refractive index by n1, the radius of curvature of the spherical face by r, the core diameter of the other optical fiber by E2, the distance between the two optical fibers by L, the focal length f of the optical fiber is expressed by f=r/(n1-1). Further, when the beam diameter on the end face of the optical fiber is given by Es, the beam diameter Es=2.L.tan(sin-1.NA1) is deduced, and the connection efficiency eta of the two optical fibers satisfies the following inequality:in the focal length f<=L; orin the focal length f>L.
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