Optical connector, optical fiber connection device, optical connector manufacturing method, and optical fiber connection method

1. An optical connector comprising:

a ferrule;

a first optical fiber retained in the ferrule;

a clamp section including an insertion section where a second optical fiber is inserted;

a solid index-matching material disposed on an end face of the first optical fiber on an insertion section side; and

a projecting portion on the end face of the first optical fiber and that projects more toward the insertion section side than a central region of the end face, wherein

the clamp section centers and fixes the first optical fiber and the second optical fiber,

the clamp section further includes a base member including a centering groove, and a lid member that presses the first optical fiber and the second optical fiber toward the centering groove,

an end of the first optical fiber is disposed in the centering groove, and

the projecting portion is disposed at a lid member side as viewed from the central region.

2. The optical connector according to claim 1 , wherein the end face of the first optical fiber is inclined with respect to a plane perpendicular to an optical axis.

3. The optical connector according to claim 2 , wherein the end face of the first optical fiber is inclined at an angle of from 4 degrees to 15 degrees, inclusive, with respect to the plane perpendicular to the optical axis.

4. The optical connector according to claim 1 , wherein a central region of the solid index-matching material projects out further than a peripheral edge region of the solid index-matching material.

5. The optical connector according to claim 4 , wherein the solid index-matching material projects more toward the insertion section side than the projecting portion.

6. The optical connector according to claim 1 , wherein an edge of the projecting portion is rounded over.

7. The optical connector according to claim 1 , wherein a thickness of the solid index-matching material on an optical axis of the first optical fiber is 20 μm or greater.

8. The optical connector according to claim 7 , wherein the thickness and a hardness of the solid index-matching material lies within a range bounded by four points: (thickness: 20 μm, shore hardness E: 30), (thickness: 20 μm, shore hardness E: 85), (thickness: 40 μm, shore hardness E: 85), and (thickness: 60 μm, shore hardness E: 30).

9. An optical fiber connection device comprising:

a base member including a centering groove that centers an end face of a first optical fiber and an end face of a second optical fiber;

a lid member that presses the first optical fiber and the second optical fiber toward the centering groove;

an insertion section where the second optical fiber is inserted;

a solid index-matching material disposed on an end face of the first optical fiber on the insertion section side; and

a projecting portion on the end face of the first optical fiber and that projects more toward the insertion section side than a central region of the end face, wherein

an end of the first optical fiber is disposed in the centering groove, and

the projecting portion is disposed at a lid member side as viewed from the central region.

10. An optical connector manufacturing method comprising:

providing an unassembled optical connector that includes a ferrule, a first optical fiber retained in the ferrule, and a clamp section including an insertion section, a base member, and a lid member;

inserting a second optical fiber into the clamp section through the insertion section;

abutting an end face of the first optical fiber, disposed in a centering groove of the base member, and an end face of the second optical fiber against each other; and

fixing the first optical fiber and the second optical fiber using the clamp section, by pressing the first optical fiber and the second optical fiber toward the centering groove with the lid member, after the first optical fiber and the second optical fiber have been abutted against each other, wherein

a solid index-matching material is disposed on an end face of the first optical fiber on an insertion section side,

a projecting portion on the end face of the first optical fiber projects more toward the insertion section side than a central region of the end face, and

the projecting portion is disposed at a lid member side as viewed from the central region.

11. An optical fiber connection method comprising:

abutting an end face of a first optical fiber, disposed in a centering groove of a base member of a clamp section including the base member and a lid member, and an end face of a second optical fiber against each other, wherein the second optical fiber is inserted into the clamp section through an insertion section of the clamp section; and

fixing the first optical fiber and the second optical fiber using the clamp section, by pressing the first optical fiber and the second optical fiber toward the centering groove with the lid member, after the first optical fiber and the second optical fiber have been abutted against each other, wherein

a solid index-matching material is disposed on an end face of the first optical fiber on an insertion section side,

a projecting portion formed on the end face of the first optical fiber projects more toward the insertion section side than a central region of the end face, and

the projecting portion is disposed at a lid member side as viewed from the central region.