Accession Number : ADP008272

Title :   Photon-Echo in Er-Doped Fibers: A new Approach to Femtosecond Time-Domain Optical Signal Processing,

Corporate Author : BELL COMMUNICATIONS RESEARCH INC RED BANK NJ

Personal Author(s) : DA Silva, V. L. ; Silberberg, Y. ; Heritage, J. P. ; Chase, E. W. ; Saifi, M. A.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Recently, interest in photon echo has been revived because of its potential application in time-domain optical memories. Several demonstrations have been reported in gases and also bulk organic and inorganic materials at cryogenic temperatures. In this paper, we report the observation of accumulated photon echo in Er doped optical fibers and demonstrate that these fibers can be used to store information on the subpicosecond time scale. Optical fibers have proved to be very attractive for studies of nonlinear optical phenomena such as optical Kerr effect, stimulated Raman and Brillouin scattering, four wave-mixing and even second harmonic generation. The great advantage of optical fibers over bulk media is in the ability to focus the light in a small core area and to propagate it without diffraction over lengths that can be as long as kilometers. By using rare-earth doped fibers, other new, stronger nonlinearities than those originated from the silica base are introduced by the dopant. As a consequence, coherent effects should be important when pulses shorter or comparable to the dephasing time of the impurity ions propagate in the fiber.

Descriptors :   *ECHOES, *FIBERS, *PHOTONS, *ERBIUM, *DOPING, CORES, CRYOGENICS, DEMONSTRATIONS, DIFFRACTION, HARMONICS, IMPURITIES, INORGANIC MATERIALS, IONS, LIGHT, MATERIALS, MEDIA, MIXING, OBSERVATION, OPTICAL PHENOMENA, PULSES, SCALE, SCATTERING, STORES, TEMPERATURE, TIME, TIME DOMAIN, OPTICAL DETECTORS, MEMORY DEVICES, GASES, BULK MATERIALS, ORGANIC MATERIALS, INFORMATION PROCESSING, DATA STORAGE SYSTEMS, NONLINEAR OPTICS, WAVE PROPAGATION, RARE EARTH ELEMENTS, COHERENCE, LASERS, GERMANIUM, CALCIUM, ALUMINUM, SILICATES.

Subject Categories : Nuclear Physics & Elementary Particle Physics
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Distribution Statement : APPROVED FOR PUBLIC RELEASE