Topic
Step-index profile
About: Step-index profile is a research topic. Over the lifetime, 3104 publications have been published within this topic receiving 53199 citations.
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TL;DR: In this paper, a simple structure for the refractive index sensing by splicing a segment of capillary with two segments of single-mode fibers (SMFs) is demonstrated, where two mode coupling regions can be formed with tapered air-cavities on both sides of the capillary.
Abstract: We demonstrate a simple structure for the refractive index sensing by splicing a segment of capillary with two segments of single-mode fibers (SMFs). By selecting appropriate splicing parameters, two mode coupling regions can be formed with tapered air-cavities on both sides of the capillary. This simple structure allows us the light propagation in the capillary with a ring mode distribution, while the high-order mode distributed in the capillary will be affected by the surrounding environment. With the inner diameter of the capillary increases, there is an enhancement of interaction between ring modes and the surrounding environment. Therefore, we can realize a tailored sensitivity based on the inner capillary diameter. Maximum refractive index sensitivities of 789, 1196, and 1684 nm/RIU can be obtained in the refractive index range from 1.3360 to 1.4365 when the inner diameter is 5, 15, and 25 μm, respectively. The distinguishing feature of such a capillary-based fiber sensor is that it can be used for the refractometry with a tailored high sensitivity through choosing the inner capillary diameter.
17 citations
TL;DR: In this paper, a non-destructive method for determining the refractive index profile of an elliptic optical fiber or preform was proposed. But the method was not suitable for the case of the preform.
Abstract: A nondestructive method of determining the refractive-index profile of an elliptic optical fibre or preform is reported. For the fibre, the pathlength data obtained from interference microscopic measurement are used. For the preform, the ray exit angles are used. These data are put into an integral that can be inverted numerically to obtain the reconstructed profile.
17 citations
TL;DR: In this article, a simple formula is given for determining the deviation of a given refractive-index profile from optimum after the differential mode delay has been measured, which is a very simple formula.
Abstract: A very simple formula is given for determining the deviation of a given refractive-index profile from optimum after the differential mode delay has been measured.
17 citations
Patent•
28 Dec 2012
TL;DR: In this article, a composite graded refractive index layer structure is provided, which includes a substrate and a composite grade-rigid index layer with varying compositions of zinc oxide and silicon oxide formed on the substrate.
Abstract: In an embodiment of the present disclosure, a composite graded refractive index layer structure is provided. The composite graded refractive index layer structure includes a substrate and a composite graded refractive index layer with varying compositions of zinc oxide and silicon oxide formed on the substrate, wherein the composite graded refractive index layer has a first surface where light penetrates thereinto and a second surface where light exits therefrom, and the composite graded refractive index layer has refractive index values which reduce from the first surface to the second surface. The present disclosure also provides an encapsulation structure including the composite graded refractive index layer structure.
17 citations
17 citations