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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.

We have developed a high speed vehicle communication network, that can be used in the real time control of ECU'S (Electronic Control Units: for example anti-lock brake systems, traction control systems etc.). This network is constructed using 6 Mbps optical links, an 8*8 passive type star coupler and access controller. Each node access in this system is controlled by the token bus method. The access controller in each node was originally designed for this network. The results of the operating test have shown that the maximum data communication time from node to node is only 300 μ s. This network has been designed so that the breakdown of any one node does not affect the other 7 nodes, and we have confirmed that this recovery system works well.