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Proceedings Paper

Investigation Of Stimulated Brillouin Scattering Switching In Mid Infrared Fibers
Author(s): Chung Yu; Chee Kiong Fong
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Paper Abstract

Backward stimulated Brillouin scattering (sBs) in optical fibers has been extensively investigated in the visible and near infrared both as an intrinsic power limiting factor in signal transmission through fibers and as a means of implementing phase conjugation and optical switching. We propose to study these effects in mid infrared (MIR) transparent fibers. Fibers transparent in this spectral region (5-10μm) hold great promise to have their intrinsic losses reduced to the theoretical limit of Rayleigh-Brillouin scattering, which varies inversely with wavelength to the fourth power. The theoretical loss limit of MIR fibers can thus be several orderslower than that in fused silica fibers. It is expected that such a significant reduction in the low-power Brillouin loss will be accompanied by a corresponding lowering in the high power sBs threshold, making it achievable in fibers through increased interaction length, while lowering incident laser power density. The inherent capability of optics for parallel processing can be fully utilized in optical computing, in which optical switching is a key element. Optical NAND gate has been demonstrated using sBs in fibers in the visible with a switching time of the order of ~100 ns. With our proposal of phonon tuning, simultaneous operation of multiple gates is possible in the same fiber. Experiments are designed for the observation of sBs in the currently most promising AgC1 and KRS-5 fibers by monitoring pump transmission through these fibers and acoustooptic radiative effects simultaneously. sBs shifted scattered light spectrum will be analyzed by laser heterodyne spectroscopy using HgCdTe and very fast metal-oxide-metal diode broadband mixers. These experimental schemes will also permit the detection of optical switching.

Paper Details

Date Published: 1 January 1987
PDF: 6 pages
Proc. SPIE 0843, Infrared Optical Materials and Fibers V, (1 January 1987); doi: 10.1117/12.968222
Show Author Affiliations
Chung Yu, North Carolina A & T State University (United States)
Chee Kiong Fong, North Carolina A & T State University (United States)

Published in SPIE Proceedings Vol. 0843:
Infrared Optical Materials and Fibers V
Paul Klocek, Editor(s)

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