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Tiny Silicon Chip Provides Broadband Gain at Telecom Wavelengths

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Four-wave mixing provides frequency conversion as well as gain.

Breck Hitz

Although gain at telecom wavelengths has been demonstrated in silicon-on-insulator photonic circuits, until now the effect had depended on stimulated Raman scattering. The Raman bandwidth is relatively narrow, but modern optical telecommunications is based on wavelength multiplexing, with many signals, each at a different wavelength, carried over an optical fiber. Raman amplification cannot amplify all the wavelengths traveling on a given fiber. Recently, however, researchers at Cornell University in Ithaca, N.Y., demonstrated broadband optical gain based on four-wave mixing in silicon....Read full article

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    Published: September 2006
    Glossary
    optical fiber
    Optical fiber is a thin, flexible, transparent strand or filament made of glass or plastic used for transmitting light signals over long distances with minimal loss of signal quality. It serves as a medium for conveying information in the form of light pulses, typically in the realm of telecommunications, networking, and data transmission. The core of an optical fiber is the central region through which light travels. It is surrounded by a cladding layer that has a lower refractive index than...
    Communicationsfiber opticsoptical fiberResearch & Technologysilicon-on-insulator photonic circuitstelecom wavelengths

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