The Ultimate Optical Fiber
Breaking with Convention
Japan's Basic Industry
Today's Master Craftspeople
Skill of Master Craftspeople Underpins State-of-the-Art Technology
Training Skilled Workers
Having Trainees Craft Products Synonymous with Training Skilled People
|Students of the Sumitomo Forestry School of Professional Building Techniques: open and responsive, these youngsters rapidly acquire the dedication required of the seasoned craftsperson.|
|The Optical Fiber Communications Conference 2002 (OFC 2002)the worlds largest optical fiber communications conferencetook place in the city of Anaheim, California in March 2002. Researchers attention was focused on a paper presented in the post deadline paper session. Sumitomo Electric Industries, Ltd. (SEI) announced that it had set a new world record for low-attenuation optical fiber performance.
Optical communications differs from conventional telecommunications in two significant ways. First, it provides far greater data transmission capacity. A single fiber optic cable thinner than a human hair can carry a volume of data equivalent to tens of thousands of copper cable telephone lines. For this reason, optical fiber is considered ideal for the Internet, which is often used for the exchange of large volumes of data such as video signal.
Second, optical fiber offers longer transmission distances. Optical signals can travel without a repeater over 100 km or so of cable. This reduces infrastructure costs, because fewer repeaters are required for amplifying signals over long distances. The reason behind progressive reduction in international phone charges in Japan and elsewhere is the significant cost savings produced by switching to optical fiber cables. Longer transmission distances are possible because of reduced attenuation; whereas the electrical signal gradually attenuates (weakens) in the process of traveling down the copper wire in a conventional telecommunications system, the attenuation of an optical signal going through an optical fiber cable is far less. Some attenuation is inevitableattenuation for standard optical fiber is 0.19dB/km.