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: The refractive index of silicon was measured at room temperature over the range 1.1-2.0 micro by autocollimation in an ~12 degrees wedge, and it is concluded that therefractive index is not known absolutely to better than the third decimal.
Abstract: The refractive index of silicon was measured at room temperature over the range 1.1–2.0 μ by autocollimation in an ~12° wedge. The image was observed by sweeping it across a slit in front of a lead sulfide cell whose output was displayed vertically on an oscilloscope while the sweep frequency was displayed horizontally. The problems of measuring the refractive index of silicon are discussed, and it is concluded that the refractive index is not known absolutely to better than the third decimal.
71 citations
TL;DR: In this article, the cladding mode resonances of a chemical etch-eroded fiber Bragg grating are proposed for highly sensitive ambient refractive index sensing, and the varying characteristics of several different order cladding modes with ambient REI are explored experimentally.
Abstract: In this Letter, the cladding mode resonances of a chemical etch-eroded fiber Bragg grating are proposed for highly sensitive ambient refractive index sensing. The varying characteristics of several different order cladding mode resonances with ambient refractive index are explored experimentally. The maximum sensing sensitivity of 172nm∕riu for the third-order cladding mode resonance is achieved in the experiments. Under the same cladding diameter, the cladding mode resonances have narrower bandwidth and response much more sensitive to the ambient refractive index changing than conventional Bragg core mode resonance, which would enable them to achieve a higher resolution.
70 citations
TL;DR: In this paper, a technique for measuring equivalent-step-index profiles of monomode fibres is presented which involves measuring the mode spot size directly as a function of wavelength, and compares favourably with measured profiles.
Abstract: A new technique for measuring equivalent-step-index profiles of monomode fibres is presented which involves measuring the mode spot-size directly as a function of wavelength, and compares favourably with measured profiles. Since characterisation of the fibre is derived from easily measured optical properties, knowledge of the actual profile and the modelling of the propagation characteristics from it is unnecessary.
70 citations
Patent•
07 Aug 2003
TL;DR: In this article, the authors proposed an optical mode transformer (OMT) with a low index core, a high index core and a first tapered region for a waveguide.
Abstract: An optical mode transformer (100). The optical mode transformer (100) features a low index core (102), a high index core (104) having a first tapered region (110), with the high index core (104) embedded within the low index core (102) and with the low index core serving as a cladding for a waveguide defined by the high index core embedded in the low index core, and a cladding layer (106) surrounding the low index core, with the cladding layer including one or more materials with different refractive indices than those of the low index core and high index core.
70 citations
Patent•
27 Jun 2001TL;DR: In this article, a planar waveguide with a graded index layer at the core/cladding interface is proposed to reduce scattering losses due to core/classing interfave roughness.
Abstract: A planar waveguide that has a graded index layer at the core/cladding interface to reduce scattering losses due to core/classing interfave roughness. The refractive index at the core/cladding interface is changed from that of the core to that of cladding gradually by having a graded index layer. The graded index layer reduces the scattering of light traveling in the waveguide by reducing the effect of the roughness at the abrupt interface between the core and the cladding. Using a proper design, the graded index layer also minimizes the modal and polarization dispersion of the optical mode traveling in the waveguide.
69 citations