Koji Seo

High density thermoplastic ferrule for optical interconnection

48-fiber thermoplastic MT ferrule is developed. The fiber hole position error is below 2.5 μm and the insertion loss is below 0.5 dB. The ferrule is cost effective compared with conventional thermosetting ferrule.

Development of low friction indoor cable

A low friction indoor cable has been newly developed. As a result of optimizing the designs of outer dimension, sheath material and stiffness, the remarkable improvement of cable installation through a conduit line is demonstrated.

New thin-type multifiber optical connectors for high density arrangement

We have developed new thin optical multi-fiber connector, which applies MT connector and is appropriated for high dense arrange. This thin-type connector consists of housing that have two latch claws for connecting to a thin-type receptacle and spring that applies pressing force to fiber endfaces. It is a feature that connection and disconnection are operated by hand. It is confirmed that the optical characteristics are favorable to be equivalent to standard MT connectors engaged by MT clip.

Examination of threshold powers for high-power problems in optical fiber

Some high power problems in optical fiber are paid attention to, accompanying the increase of operating optical power. Especially, this paper reports experimental data gathered on three problems stated as follows. The first problem is the destruction of fiber endface, and short-term 2W exposure tests of mated FC connector pairs prepared with various endface conditions are evaluated in this paper. The second problem is so-called fiber fuse, which is the phenomenon that only core region of an optical fiber melts locally by high optical power in the fiber and the damage propagates toward the light source. We measured threshold power of the propagation, concerning several kinds of fiber, and suggest how to stop it. The third problem is the fiber coat burning, which is caused by the leak light when the fiber is broken or bent accidentally under high power environment. Several kinds of fiber coated with different materials and colors were made loops of various diameters and examined under high power condition at 1W to 3W of 1480 nm.Some high power problems in optical fiber are paid attention to, accompanying the increase of operating optical power. Especially, this paper reports experimental data gathered on three problems stated as follows. The first problem is the destruction of fiber endface, and short-term 2W exposure tests of mated FC connector pairs prepared with various endface conditions are evaluated in this paper. The second problem is so-called fiber fuse, which is the phenomenon that only core region of an optical fiber melts locally by high optical power in the fiber and the damage propagates toward the light source. We measured threshold power of the propagation, concerning several kinds of fiber, and suggest how to stop it. The third problem is the fiber coat burning, which is caused by the leak light when the fiber is broken or bent accidentally under high power environment. Several kinds of fiber coated with different materials and colors were made loops of various diameters and examined under high power condition a...