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timing of pulses from modal dispersion



With all the light in one mode, there is no spread in the timing of pulses from modal dispersion, and the multimode fiber can transmit at the much higher data rates of singlemode fiber. "You have to be very precise, so 99.5 percent of the light will be in the right mode, and that's very hard to do," Morizur says.

The company is not giving out details about its process, but telecommunication researchers seeking to achieve ultra-high fiber capacities have transmitted signals in up to six separate modes through fibers with cores of about 20 µm. Each of those modes can transmit at singlemode rates, allowing modal division multiplexing that multiplies the data rate by the number of modes used.
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Cailabs has packaged the technology in its Aroona system which can be plugged into existing multimode networks to multiply capacity by a hundredfold. The company has already installed many systems in Europe and a few in the United States at sites including universities, chemical plants, defense bases, refineries, and high schools.

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