It is known that no uniform electric field profile exists in a planar linear waveguide. The uniform core field can be shown to exist in symmetrical planar waveguides and circular fibers with nonlinear claddings. Theor...
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It is known that no uniform electric field profile exists in a planar linear waveguide. The uniform core field can be shown to exist in symmetrical planar waveguides and circular fibers with nonlinear claddings. Theoretical analysis and numerical calculations are carried out to show that when the modal index equals to the core refractive index, the core field becomes uniform at an appropriate optical power. Analysis for a step index circular fiber with nonlinear cladding have also shown that the core field becomes uniform under similar conditions. The occurrence of a uniform field in a waveguide core may believe to have promising applications in waveguide, optoelectronic and photonic devices.
In this paper, an optical fiber sensor is reported to be capable of measuring the concentration of the solution. When a 2×2 fused tapering single-mode optical fiber coupler is immersed in the solution, the light prop...
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In this paper, an optical fiber sensor is reported to be capable of measuring the concentration of the solution. When a 2×2 fused tapering single-mode optical fiber coupler is immersed in the solution, the light propagating through the fused tapered coupler and makes the coupling ratio (CR) sensitive to the variation of the liquids concentration surrounding the fused tapering zone of the coupler. So, the sensor can be realized. As a result, the solution concentration can be measured by the corresponding change of the CR. In addition, the theoretical and experimental processes are presented in the paper.
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