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Mode excitation in graded-index optical fibers
Journal of Lightwave Technology, 1984We report on theoretical and experimental investigations of the excitation of graded-index fiber modes by a laser beam. The far-field irradiance distribution and the focusing qualities are measured and are related to the measured refractive-index profiles of some commercially available graded-index fibers.
L. Lundgren, K. Vilhelmsson
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Optimum design of graded-index fiber structure
Optical Fiber Communication, 1979It is generally accepted that graded-index fiber will soon be in practical use for medium- to large-capacity trunk lines. However, the procedure for fiber structural design is not fully established. Fiber parameters should be determined considering the synthetic requirement for transmission characteristics, mechanical properties, installation and ...
Shigeyuki Seikai +3 more
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Profile inhomogeneity in multimode graded-index fibers
Journal of Lightwave Technology, 1989Profile parameters (g) of several multimode graded-index fibers have been measured. It was found that g may vary azimuthally by +or-0.15 or more in fibers for which the average value is between 1.8 and 2.2. >
C.W. Oates, M. Young
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Mode Coupling Effects in Graded-Index Optical Fibers
Applied Optics, 1975Mode coupling theory is applied to the study of multimode optical fibers with graded-index cores. For coupling caused by random bends in the waveguide axis, the results predict the dependence of the induced losses on the fiber's characteristics. The impulse response is determined for fibers with random bends having several different power spectra.
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Principal Modes in Graded-Index Multimode Fibers
Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics & Photonics Technical Digest, 2009We model multimode propagation, including spatial- and polarization-mode coupling. At low coupling, the impulse response is polarization-dependent; differential mode delays (DMDs) scale linearly with length. At high coupling, DMDs scale as the square-root of length.
Mahdieh B. Shemirani, Joseph M. Kahn
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Tapered Graded Index Fibers for Sensing Applications
Workshop on Specialty Optical Fibers and their Applications, 2013Optical sensors based on modal interference are improved by tapering a small extension of a graded-index fiber. The tapered section modulates the periodic amplitude of the propagated beam, substantially increasing the sensitivity of these devices.
Felipe Beltrán-Mejía +2 more
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Guided modes in graded index optical fibers
Journal of the Optical Society of America, 1977A new approach to optical propagation in graded index fibers, based on local tracking of evanescent waves, is developed. The theory furnishes the high-frequency asymptotic expansion of the modal field and yields explicit tractable expressions for the expansion coefficients.
S. Choudhary, L. B. Felsen
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Modified graded-index fibers for chemical sensing
SPIE Proceedings, 1999Multimode optical fibers with inverted parabolic refractive- index profiles (IGI fibers) have been shown promising for the fabrication of sensing modules for evanescent-wave chemical detection. Besides IGI fibers with parabolic index profiles, this paper deals with theoretical and experimental investigation of some other types of IGI fibers ...
Miroslav Chomat +8 more
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Vectorial wave analysis of graded‐index fibers
Radio Science, 1982A vector wave analysis is proposed for analyzing the propagation characteristics of the guided modes of the graded‐index fibers. Two pairs of the vector wave equations with respect to the transverse components of the electromagnetic fields are derived and solved by the perturbation method in which we use the scalar wave equation as an unperturbed one ...
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Phase integral solutions for graded-index fibers
Journal of the Optical Society of America A, 1985For the dispersion-optimized range of power-law refractive-index profiles in optical fibers, the phase and the eigenvalue integrals appearing in Wentzel–Kramers–Brillouin solutions are solved. These new solutions provide an explicit description of the electromagnetic-field distributions and phase constants in weakly guiding fibers with power-law ...
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