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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 article, a novel long-period fiber grating via periodically embedding no-core fiber (NCF) has been achieved, which can exhibit an extremely high loss resonant dip (>20dB).
Abstract: A novel long-period fiber grating via periodically embedding no-core fiber (NCF) has been achieved. The 11-period SMF-NCF-SMF-long period fiber grating (SNS-LPG) can exhibit an extremely high loss resonant dip (>20 dB). Theoretical analysis shows good agreement with the measured transmission spectrum. We investigated both refractive index and temperature sensitivity of SNS-LPG. The fabricated sensor achieve an average wavelength sensitivity of 141.837 nm/RIU in the range of 1.333–1.400 RIU, and exhibit lower temperature sensitivity (−6.43 pm/ °C and 0.005 dB/ °C).
37 citations
TL;DR: In this article, a fiber sensor based on polarization-maintaining fiber loop mirror (FLM) for liquid refractive index absolute measurement is described, which can be obtained by detecting the interference wavelength difference corresponding to the two sections of PMFs.
Abstract: A fiber sensor based on polarization-maintaining fiber loop mirror (FLM) for liquid refractive index absolute measurement is described. Two sections of polarization maintaining fibers (PMFs) with different length were inserted into the FLM. One section of PMF was chemical etched for liquid refractive index measurement and the other one for reference. Liquid refractive index absolute measurement can be obtained by detecting the interference wavelength difference corresponding to the two sections of PMFs. High sensitivity of 63.82 ± 0.04 nm/RIU (refractive index unit) and a resolution of 3.14 × 10−4 RIU were obtained for the proposed liquid refractive index sensor.
37 citations
TL;DR: Refractive index dispersion data are reported for the iron garnets Gd2.3Tb 0.7Fe5O12, Eu2Er1Ga0.7 Fe4.3O12.
Abstract: Refractive index dispersion data are reported for the iron garnets Gd2.3Tb0.7Fe5O12, Eu2Er1Ga0.7Fe4.3O12, and Eu2Er1Al0.7Fe4.3O12. Using a Sellmeier oscillator formulation these data are compared with results for several iron‐free garnets, and the relative importance of optical transitions involving Fe, Ga, and Al are briefly discussed. Finally, dispersion curves are presented for the effective refractive index n to be used in the computation of film thickness from optical interference fringe count data.
37 citations
Patent•
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TL;DR: In this article, an optical fiber device comprises a core and a cladding, the core being made of an optical material having a refractive index n₁, and the cladding being made by an anisotropic optical material with a similar index.
Abstract: An optical fiber device (31) comprises a core (35) and a cladding (33), the core (35) being made of an optical mate rial having a refractive index n₁, and the cladding being made of an optical material having a refractive index n₂, end (34) of the optical fiber from which light radiates form ing a plane that is inclined to the fiber axis by an angle ϑ, a light reflective layer being formed at least on the outer pe riphery of said radiating end, and the two refractive indices n₁ and n₂ satisfying the following relation (1): n₁-n₂≧ 0.01 (1).
37 citations
Patent•
19 Jul 2010
TL;DR: In this article, a multimode fiber including a core and a cladding was designed to reduce the additional bending loss of the fiber, improves the bending resistance and mechanical properties, basically eliminates the internal stress, and ensures the service life even working for a long term under the condition of low radius.
Abstract: A multimode fiber including a core and a cladding. The core has a radius (R1) of 24-26 μm, the refractive index profile thereof is a parabola, and the maximum relative refractive index difference (Δ1) is 0.9-1.1%. The cladding surrounds the core and includes from inside to outside an inner cladding, a middle cladding, and an outer cladding; a radius (R2) of the inner cladding is 1.04-1.6 times that of the core, and a relative refractive index difference (Δ2) thereof is −0.01-0.01%; the middle cladding is a graded refractive index cladding whose radius (R3) is 1.06-1.8 times that of the core, and a relative refractive index difference thereof is decreased from Δ2 to Δ4; and a radius (R4) of the outer cladding is 2.38-2.63 times that of the core, and a relative refractive index difference (Δ4) thereof is between −0.20 and −0.40%. The invention reduces the additional bending loss of the fiber, improves the bending resistance and mechanical properties, basically eliminates the internal stress, and ensures the service life even working for a long term under the condition of low radius. The method for producing the fiber is simple, effective, and suitable for mass production.
37 citations