![]() NTT has developed the technology to multiply three to five wavelengths of light signals emitted by a single semiconductor laser to more then 300 wavelengths using the phenomenon in which light signals with various wavelengths are generated in a chain reaction when the original light passes through a very narrow space. The system was developed using optical wavelength division multiplexing technology, a method of sending signals of various wavelengths by overlapping them. Within one to two years, NTT plans to introduce the new system into its main fibre-optic network linking large cities. The system may reduce the cost of building a large capacity communications network to one-tenth of the current cost. The system is capable of transmitting 3.13 terabits of data per second, so the equivalent of 75 films of two-hour duration can be sent in one second. An optical communications system that can send optical signals of 313 different wavelengths through a single fibre optic line has been developed by NTT.
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