The research and development of Selfoc fibers

The first announcement to public mass media  and the first presentation at the international conference of Selfoc optical fiber

Fig.1 The first announcement to public mass media and the first presentation at the international conference of Selfoc optical fiber

The first optical fiber (Selfoc) communication equipment in the world

Fig.2 The first optical fiber (Selfoc) communication equipment in the world

  In November of 1968, the first optical fiber for communication use, named Selfoc, was press-released. This fiber was initially made by ion-exchange method; a compound glass rod 1 mm in diameter and 1 m in length was immersed in a dilute nitric salt bath for several hundreds hours and then drawn to a fiber. This rod itself was just a graded refractive index (GRIN) lens. This was the first optical fiber for communication use. In 1970, Corning Glass Works disclosed a low loss silica glass fiber with step index type. This type of Silica fiber was made by using vapor phase or MOCVD.

  Although the loss of Selfoc fiber reached 20 dB/km finally, the impurity contamination from crucibles obstructed to realize lower loss than that of Silica fiber. Therefore, the Selfoc research and development was directed to micro-optic devices rather than long transmission line use. The micro-optics were widely applied to coupling from LDs to fiber, wavelength multiplexer/demultiplexer, and a variety of imaging use in printer/facsimile and medical use, etc.

  Thus, the first Micro-Optics Conference was inaugurated in October 1987. Afterward, Micro-Optics Conference has been developed to an international conference, which is held every year.



Publications

[1] Teiji Uchida, Motoaki Furukawa, Ichiro Kitano, Ken Koizumi, and Hiroyoshi Matsumura、Optical Characterisitics of a Light-Focusing Fiber Guide and Its Applications、1970、IEEE Journal of Quantum Electronics, Vol.QE-6, No.10, October 1970
[2] T. Uchida (Invited Speaker) and S. Sugimoto、Micro-Optic Devices for Optical Communications、1978、Fourth European Conference on Optical Communication, Genova, September 12-15, 1978
[3] Teiji Uchida、Micro-Optics: Its Birth and Development (Invited Paper)、1987、First Micro-Optics Conference: MOC'87 Tokyo, October 15-16, Tokyo, 1987

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Communication
(Electronics)

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