Optical connector and optical connector connection structure
The present disclosure relates to an optical connector includes at least one optical fiber; and a lens element including at least one lens that couples light to an end face of the optical fiber. The distance FLh between the end face of the optical fiber and a vertex of the lens is expressed by the sum of the distance FL from the vertex of the lens to the focal point F positioned in a back face direction of the lens and the length δ between the end face of the optical fiber and the focal point F, and the length δ is longer than 10 μm.
1. An optical connector comprising:
at least one optical fiber;
a lens element including at least one lens that couples light to an end face of the optical fiber;
a ferrule holding the optical fiber; and
an adhesive filled between the ferrule and the lens element, wherein
a distance FLh (μm) between an end face of the optical fiber and a vertex of the lens is expressed by a sum of a distance FL (μm) from the vertex of the lens to a focal point F positioned in a back face direction of the lens and a length δ (μm) between the end face of the optical fiber and the focal point F,
the length δ is longer than 10 μm,
the back face of the lens is fixed to the end face of the optical fiber via an adhesive,
a connection loss during high power light input is smaller than a connection loss during low power light input,
the high power is an incoming optical power of +20 dBm or more,
the low power is an incoming optical power less than +11 dBm,
the optical fiber is a single-mode fiber.
2. The optical connector according to claim 1 , wherein
the lens element includes a resin material.
3. The optical connector according to claim 1 , wherein
the lens element and the ferrule include the same resin material.
4. The optical connector according to claim 2 , wherein
the resin material is cycloolefin polymer or polyetherimide.
5. The optical connector according to claim 1 , comprising
a filling medium between the end face of the optical fiber and the lens element, wherein
the filling medium is an adhesive.
6. The optical connector according to claim 1 , wherein
the at least one optical fiber is a plurality of optical fibers, and
the at least one lens is a plurality of lenses corresponding to the optical fibers.
7. The optical connector according to claim 1 , wherein
the length δ is longer than 20 μm.
8. The optical connector according to claim 1 , wherein
the length δ is 100 μm or less.
9. An optical connector connection structure, wherein
at least one of optical connectors to be mated includes the optical connector according to claim 1 .
10. The optical connector according to claim 1 , wherein
a difference between linear expansion coefficients of the ferrule and the lens element is 20 ppm/° C. or less.