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 article, a double cladding structure of a pure silica multimode step-index fiber with a 100/110 μm core/cladding diameter reached a length of approximately 9∼10 mm from the input surface of the optical fiber with the diameters ranging from 5 to 8 μm at input intensities more than 1.5×10 12 W/cm 2.
29 citations
TL;DR: In this paper, the authors deduced the near-field intensity distributions of the waveguide's guided modes to obtain the refractive index profiles of channel waveguides, which are then used for subsequent signal processing.
Abstract: Refractive index profiles of waveguides are deduced from near-field intensity distributions of guided modes. To improve the accuracy of refractive index profiles, some measurements are taken with the center peak of the mode intensity profile blocked, allowing the increase of the optical power at the waveguide boundaries with a corresponding increase in the signal-to-noise ratio. Additional improvements reported here are related to the subsequent signal processing, which is performed mainly in the spatial frequency domain. Smooth and reliable profiles of channel waveguides are obtained, the method being very general and not presuming the functional dependence of n(x, y).
29 citations
Patent•
18 Mar 2005TL;DR: In this article, a complex type scattering-dichroic absorbing polarizer including a film that has a structure having a minute domain dispersed in a matrix formed of an optically-transparent water-soluble resin including an iodine based light absorbing material was introduced.
Abstract: An optical film of the invention comprises: a complex type scattering-dichroic absorbing polarizer including a film that has a structure having a minute domain dispersed in a matrix formed of an optically-transparent water-soluble resin including an iodine based light absorbing material; and a retardation layer including a transparent layer that has a thickness of at most 10 μm and exhibits refractive index anisotropy characterized by nx≈ny>nz, where a thickness direction of the transparent layer is defined as Z-axis and refractive index in Z-axial direction is defined as nz, an in-plane refractive index of the transparent layer perpendicular to Z-axis gives a maximum is defined as X-axis and refractive index in X-axial direction is defined as nx, and a refractive index of the transparent layer perpendicular to Z- and X axes is defined as X-axis and refractive index in Y-axial direction is defined as ny. The optical film has a high transmittance and a high degree of polarization, can produce high contrast in a wide viewing angle range, and can suppress unevenness in transmittance during black viewing.
29 citations
TL;DR: In this paper, the radiation losses of tunnelling leaky modes in graded-index optical fibres are calculated theoretically, and it is shown that the near-field intensity profile has a length dependence.
29 citations
TL;DR: In this paper, a fiber sensor for simultaneous measurement of refractive index (RI) and temperature in solutions based on multimode interference is presented, where the intensity and the wavelength of the interference minimum will vary with the RI and the temperature of the solution, respectively.
Abstract: A fiber sensor for simultaneous measurement of refractive index (RI) and temperature in solutions based on multimode interference is presented. The intensity and the wavelength of the interference minimum will vary with the RI and the temperature of the solution, respectively. The sensitivity of the RI and the temperature are 94.58 dB/RI and 0.0085 nm/°C, respectively. Its ease of fabrication and low-cost offer the attractive applications in chemical and biological sensing.
29 citations