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Guided acoustic wave Brillouin scattering in optical fibers

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Abstract

Optical fibers are generally considered passive devices; the light transmitted through them at reasonable power levels may be attenuated but is not expected to be modulated. It has long been known, however, that thermally excited vibrational and diffusional fluctuations cause light scattering in glass.1 This process is responsible for the fundamental limit on the attenuation of light in a fiber but has not been expected to modulate the transmitted beam for the same reason that a laser beam passing through a glass window is not modulated; scattering in the exact forward direction is possible only at zero frequency shift. We have, however, detected modulation of the transmitted wave in a single-mode fiber due to thermally excited vibrations.

© 1985 Optical Society of America

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