We have developed an optical link which is suitable for the on-vehicle environment and can be used in navigation systems and other applications. The distinctive features of this link are its fiber structure, terminal processing, shielding and protective mechanism for fiber ends. In terms of the fiber structure, a high tension of 100N has been realized without using tension member in the fiber, and a heat resistance temperature of 105 deg C has also been achieved. Terminal processing is done with only crimping and heat treatment, and shielding of the receiver IC is achieved with a molded component composed of electrically conductive plastic. To keep the ends of fibers from being damaged or soiled, the link is equipped with a mechanism wherein a protective hood rotates at engagement and disengagement.