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, the surface contouring caused by routine polishing of fibers and preforms in preparation for measurement of the refractive index profile has been studied by observation of the surface interference fringes.
Abstract: The surface contouring caused by routine polishing of fibers and preforms in preparation for measurement of the refractive index profile has been studied. By observation of the surface interference fringes the effect of polishing on doped preforms is visualized. It is found that composition‐dependent thickness variations occur which can cause a sizable error in the refractive index variation deduced by interference measurements in performs (several percent) and in fibers (∼50%). The difficulty is eliminated by several minutes of additional polishing on a hard lap.
19 citations
TL;DR: In this paper, a new theoretical model considering the refraction of the incident light beam by the fiber is suggested to determine the refractive index profile of bent optical fibres, which is used to obtain the induced birefringence and the guiding parameters.
19 citations
TL;DR: In this article, the effect of bending of step-index optical fiber on its refractive index profile and the mode field distribution were investigated, and an enhanced slab model was suggested.
19 citations
TL;DR: In this paper, an optical sensor based on the interference pattern created by an all-fiber Mach-Zehnder setup is presented, which is produced by the combination of the core and cladding modes that are excited on a fiber with reduced diameter fusion spliced to a single-mode fiber with a 4- $\mu \text{m}$ core axial offset.
Abstract: We report an optical sensor based on the interference pattern created by an all-fiber Mach–Zehnder setup. This pattern is produced by the combination of the core and cladding modes that are excited on a fiber with reduced diameter fusion spliced to a single-mode fiber with a 4- $\mu \text{m}$ core axial offset. Discrete measurements of refractive index and temperature are achieved with sensitivities of 8.8 nm/refractive index units and 39.2 pm/°C, respectively, and also distributed measurements of liquid level up to 120 mm are made with a sensitivity of 6 pm/mm.
19 citations
Patent•
20 Feb 2009
TL;DR: In this paper, an optical fiber that has a small bending loss, can be securely prevented from being fractured due to accidental bending during installation or other operations, and is compliant with the G 652 standard is presented.
Abstract: Provided is an optical fiber that has a small bending loss, can be securely prevented from being fractured due to accidental bending during installation or other operations, and is compliant with the G 652 standard. An optical fiber 1 includes a core 11, a first cladding 12, a second cladding 13, and a third cladding 14. The relative refractive index difference Δ1 of the core 11 is in the range of 0.3% to 0.38%, the relative refractive index difference Δ2 of the first cladding 12 is equal to or smaller than 0%, and the relative refractive index difference Δ3 of the second cladding 13 is in the range of -1.8% to -0.5%. The inner radius r2 and the outer radius r3 of the second cladding 13 satisfy the expression "0.4r2 + 10.5 < r3 < 0.2r2 + 16", and the inner radius r2 of the second cladding 13 is equal to or greater than 8 µm. The bending loss at a wavelength of 1550 nm and at a radius of curvature of 7.5 mm is smaller than 0.1 dB/turn, and the bending loss at a wavelength of 1625 nm and at a radius of curvature of 4 mm is greater than 0.1 dB/turn.
19 citations