Ferrule and ferrule with optical fiber

A ferrule for optically connecting an optical fiber to an optical part, the ferrule comprising:na positioning mechanism configured to position an intermediate portion of the optical fiber having a predetermined outer diameter;a recess configured for an adhesive to be disposed therein and comprising a first inner wall from which a front end of the optical fiber positioned by the positioning mechanism is protrudable, and a second inner wall opposite to the first inner wall, wherein:the second inner wall is configured to be abutted by substantially an entire area of a front end surface of the optical fiber;a bottom of the recess is positioned lower than a lower edge of the front end of the optical fiber that protruded from the first inner wall; anda distance between the first inner wall and the second inner wall is more than or equal to half of the outer diameter of the optical fiber and less than or equal to four times the outer diameter of the optical fiber.

An optical connector for optically connecting an optical fiber to an optical part, the optical connector comprising:nan optical fiber; anda ferrule comprising:na positioning mechanism which positions at least an intermediate portion of the optical fiber; a recess comprising a first inner wall from which a front end of the optical fiber protrudes, and a second inner wall opposite to the first inner wall; andan adhesive disposed in the recess and a surrounding portion of the optical fiber protruding from the first inner wall, wherein:a bottom of the recess is positioned lower than a lower edge of the front end of the optical fiber that protruded from the first inner wall;a distance between the first inner wall and the second inner wall is more than or equal to half of the outer diameter of the optical fiber and less than or equal to four times the outer diameter of the optical fiber; andsubstantially an entire area of a front end surface of the optical fiber abuts the second inner wall.