Publication

Negative Group Velocity of Light in Optical Fibers

Luc Thévenaz, Kwang-Yong Song
2005
Conference Papers

Abstract

We demonstrate experimentally that negative group velocities of light can be achieved in conventional optical fibers by use of the stimulated Brillouin scattering effect. Velocities as slow as 71000 km/s can also be achieved.

Official source

https://infoscience.epfl.ch/entities/publication/fff9b66b-918f-484e-b317-c44c3e93ad2f

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Luc Thévenaz, Kwang-Yong Song
2005
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/fff9b66b-918f-484e-b317-c44c3e93ad2f

About this result

Related concepts (17)

Optical fiber

An optical fiber, or optical fibre in Commonwealth English, is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair. Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than electrical cables.

Multi-mode optical fiber

Multi-mode optical fiber is a type of optical fiber mostly used for communication over short distances, such as within a building or on a campus. Multi-mode links can be used for data rates up to 100 Gbit/s. Multi-mode fiber has a fairly large core diameter that enables multiple light modes to be propagated and limits the maximum length of a transmission link because of modal dispersion. The standard G.651.1 defines the most widely used forms of multi-mode optical fiber.

Group velocity

The group velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes—known as the modulation or envelope of the wave—propagates through space. For example, if a stone is thrown into the middle of a very still pond, a circular pattern of waves with a quiescent center appears in the water, also known as a capillary wave. The expanding ring of waves is the wave group or wave packet, within which one can discern individual waves that travel faster than the group as a whole.

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