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Generator Launches Selected Mode into Multimode Waveguide

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New device facilitates ‘mode division multiplexing’ to boost fiber capacity.

Breck Hitz

Although large amounts of “dark fiber” — that is, unused fiber cables laid across cities, nations and oceans — still exist in the world today, the demand for capacity is constantly increasing. To satisfy this demand, telecom scientists are searching for techniques to expand the capacity of existing fibers. Many laboratories are trying to cram more information onto each wavelength in the fiber by increasing the data rate. Elsewhere, scientists are squeezing more and more distinct wavelengths into the narrow C-band — between 1530 and 1565 nm — where optical fibers and other telecom...Read full article

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    Published: December 2006
    Glossary
    dark fiber
    Unused fiber; fiber that has been installed but reserved for future use. Carrying no light.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    wavelength division multiplexing
    A system that allows the transmission of more than one signal over a common path, by assigning each signal a different frequency band. Also known as frequency division multiplexing.
    Communicationsdark fiberfiber opticsphotonicsResearch & TechnologyTech Pulsewavelength division multiplexingwavelengths

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