OPTICAL FIBRE INCORPORATING A VARIABLE INTERNAL BRAGG GRATING AND ITS APPLICATIONS

摘要

Optical fibre device having a core and coaxial sheath. The core and coaxial sheath provides a light amplifier when optically pumped. Interfering optical waves incident to the fiber having a predetermined intensity and wavelength inscribe an ephemeral periodic index strata grating over at least part of the fiber core when the core is illuminated. In the absence of illumination by interfering waves, the grating disappears.