| 摘要 |
The "mode field conditioner" (MFC) includes a radially contracted region in a cylindrical dielectric waveguide wherein, optical power density undergoes transition from low to high values in order to stimulate or enhance certain nonlinear optical effects or combinations of nonlinear optical effects; i.e., frequency conversions, phase transitions, polarization changes, the magnitude of which changes are proportional to the precise degree of light concentration that takes place. An intrinsic transition from linear fiber optic links to nonlinear optical transmission lines or networks can be made by an appropriate concatenation or arrangement of one or more of the suitably designed mode field conditioners. The mode field of the transmitted light may be decreased corresponding to increase power density, a phase-shift may be induced via self-phase modulation, frequency conversion may occur via stimulated Raman scattering or stimulated four-photon mixing, temporal and/or spatial pulse shaping may occur via a combination of nonlinear effects, or a rotation in the polarization or a change from linear to circular polarization or vice versa.
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