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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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02 Dec 2010
TL;DR: In this paper, the authors present results of measurements for refractive index profile of silica graded multimode optical fibers are presented, where the measurement technique is described and the estimation of parameters for profile defects of investigated ∼€ 0.672€ samples of multimodal optical fibers is received.
Abstract: In this article present results of measurements for refractive index profile of silica graded multimode optical fibers are
presented. The measurement technique is described. Estimation of parameters for profile defects of investigated
samples of multimode optical fibers is received. Analysis data for effect of profile defects of graded multimode optical
fibers (MMF) on differential mode delay (DMD) is presented.
32 citations
TL;DR: In this paper, the nonlinear refractive index n 2 of silica fiber (24 m) and erbium-doped fiber (10 m) is measured to within an accuracy of 5% by use of time-delayed photorefractive beam coupling of intense 53-ps, 1.064-μm pulses that experience self-phase modulation in the fibers.
Abstract: The nonlinear refractive index n 2 of silica fiber (24 m) and erbium-doped fiber (10 m) is measured to within an accuracy of 5% by use of time-delayed photorefractive beam coupling of intense 53-ps, 1.064-μm pulses that experience self-phase modulation in the fibers. The resultant induced grating autocorrelation response yields a value of n 2 /A eff and a calibration standard for the fiber. A phase shift of the order of 0.19π can be detected and is limited only by laser amplitude fluctuations. A unique advantage of this technique is its ability to measure n 2 accurately in short lengths (z≤25 m) of fiber, whereas other approaches typically use much longer lengths of fiber (z≥100 m) .
32 citations
TL;DR: In this article, strong mode coupling increases the GI POF bandwidth from its profile-determined value of 0.43 GHz to its measured value of 3.0 GHz for 100 m. The measured refractive index profile is not parabolic, but consists of two markedly different regions.
Abstract: Observations in high bandwidth graded-index plastic optical fibers (GI POFs) are reported of strong mode coupling and its characteristic square root-like fiber length dependence of the optical pulse broadening. We have further found that the measured refractive index profile is not parabolic, but consists of two markedly different regions. Analysis of the index profile reveals that strong mode coupling increases the GI POF bandwidth from its profile-determined value of 0.43 GHz to its measured value of 3.0 GHz for 100 m.
32 citations
TL;DR: In this article, a heavily germanium-doped silica fiber with a four-layer refractive index profile is proposed to obtain all normal flat dispersion property. And the results show that the flat-top supercontinuum spectrum ranging from 1000 to 2600 nm can be generated by launching pump pulses at the wavelength of 1550 nm.
Abstract: A heavily germanium-doped (Ge-doped) silica fiber with a four-layer refractive index profile is proposed to obtain all normal flat dispersion property. The waveguide dispersion in the fiber can be modified by adjusting the fiber parameters, including the refractive indices and the core radiuses. As a result, the flat normal dispersion in the fiber can be obtained in the wavelength range of 1540–2600 nm, where the values of the dispersion slope are between $-$ 0.0058 and 0.03 $\hbox{ps/nm}^{2}/\hbox{km}$ . Furthermore, the numerical results show that the flat-top supercontinuum spectrum ranging from 1000 to 2600 nm can be generated by launching pump pulses at the wavelength of 1550 nm in the heavily Ge-doped fiber with a four-layer refractive index profile.
32 citations
TL;DR: Experimental results indicated that these two resonant spectra shifts were linearly dependent on the variation of the RI in the range of 1.3333 approximately 1.4118 and on the temperature in therange of -10 degrees C approximately + 80 degrees C.
Abstract: A fiber-optic sensor for simultaneous measurement of refractive index (RI) and temperature was proposed and demonstrated. It was fabricated by cascading two sections of specialty double cladding (DC) fibers which presented a pair of well-separated resonant spectra dips. The sensing properties of temperature and ambient RI were investigated theoretically based on the coupled mode theory. Experimental results indicated that these two resonant spectra shifts were linearly dependent on the variation of the RI in the range of 1.3333~1.4118 and on the temperature in the range of −10°C~ + 80°C. Such a fiber-optic sensor is simple and easy for mass production and has potential applications for biosensors or chemical sensors.
32 citations