Abstract: In a plug connector that incorporates an optical connector and a photoelectric conversion module connected with the optical connector, the optical connector attached to an optical cable is accommodated in an end bell and the photoelectric conversion module is accommodated in a barrel inserted into a mating receptacle connector. The barrel and the end bell go in a fitting completion state (locked state) by a Z-axis-direction locking mechanism and a rotation locking mechanism around the Z axis when the end bell is fitted to the barrel and the end bell is rotated about an axial center thereof (Z axis). The end bell can be detached from the barrel when the end bell is rotated in a reverse direction to that in locking while operating the locking member functioning as a rotation lock and releasing the rotation lock.

Abstract: An optical connector includes a connector housing that holds a ferrule such that the ferrule is allowed to move backward along a connecting direction, and the optical fiber in the connector housing has at least one loop element each having a tangential line along the connecting direction and a pair of tangential line portions connected to the at least one loop element and is held in such a manner as not to prevent a radius of curvature of the at least one loop element from becoming larger as the ferrule moves backward along the connecting direction.

Abstract: This invention relates to a method for tuning optical characteristic of an optical module. The tuning method in optical characteristic of an optical module consisting of an optical fiber, a lens, an optical filter and a filter holder, comprising: a step of tuning an optical characteristic to turn the optical filter or the said optical fiber around the axis offset from the center of the said optical filter.

Abstract: This invention relates to a method for tuning optical characteristic of an optical module. The tuning method in optical characteristic of an optical module consisting of an optical fiber, a lens, an optical filter and a filter holder, comprising: a step of tuning an optical characteristic to turn the optical filter or the said optical fiber around the axis offset from the center of the said optical filter.