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Refractive Index Grading Optimization for Rectangular Core Fiber
Optical Fiber Communication Conference (OFC) 2020, 2020We optimize the refractive index grading for rectangular core fibers in support of mode division multiplexing. Designs maximizing the effective index separations for MIMO-less support and others minimizing the differential group delays are identified.
Lior Rechtman, Dan M. Marom
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Mode coupling effects in a graded-index fiber cable
Applied Optics, 1981Mode coupling coefficients and impulse response in graded-index fibers are investigated both experimentally and theoretically. Mode coupling coefficient measurements at lambda = 1.27 microm are made for fibers before and after cabling. The magnitude variation of the mode coupling coefficients due to cabling is found to be relatively small, and the ...
M, Ohashi, K, Kitayama, S, Seikai
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Differential mode attenuation measurements in graded-index fibers
Applied Optics, 1978An automated apparatus is described for measuring mode-dependent scattering and total attenuation in graded-index waveguides. Measurements are reported for two low-loss waveguides and several high-loss waveguides. The results illustrate the ability of this technique to identify different types of loss mechanisms.
R, Olshansky, S M, Oaks
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Measurements of mode conversion coefficients in graded-index fibers
Applied Optics, 1980A new method of measuring mode conversion coefficients in multimode fibers is proposed. The principle is based on the phenomenon that modal power propagating along a fiber undergoes a gradual change due to mode coupling and mode-dependent losses. Application of the principle has made it possible to measure mode conversion coefficients of a graded-index
K, Nagano, S, Kawakami
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Graded-index silver chlorobromide fibers for the mid-infrared
Applied Optics, 2005We have developed and characterized graded-index optical fibers for the mid-IR spectral range, based on silver chlorobromide (AgClBr) crystals. A preform was fabricated by inserting a cylindrical rod made of AgCl(0.1)Br(0.9) into a tube made of AgCl(0.9)Br(0.1). The preform was heated in an oven, causing diffusion of Cl into the outer layer of the rod,
Ben-Zion, Dekel, Abraham, Katzir
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WKB analysis of graded-index multimode fibers with a central-index dip
Applied Optics, 1983We have extended the Gloge-Marcatili analysis to include the effect of a refractive-index dip in a multimode fiber characterized a square-law profile. The analysis gives analytical expressions for the propagation characteristics and shows that the dip has a very significant effect on the impulse response.
A K, Ghatak, R, Srivastava
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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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Analysis and evaluation of graded-index fiber lenses
Journal of Lightwave Technology, 1987The problem of transverse and axial misalignment sensitivity associated with the coupling of single-mode fibers is often addressed by using an expanded beam technique. This technique improves the coupling tolerances for relative displacements of the expanded beams. The success of this scheme relies on the integrity of the bond between the fiber and the
W. L. EMKEY, C. A. JACK
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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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Transmission characteristics of splices in graded-index multimode fibers
Applied Optics, 1981Losses and baseband bandwidth changes caused by a splice in a graded-index multimode fiber have been studied theoretically. Splices are classified into three categories, and their influence on mode conversion coefficients and baseband frequency response has been investigated. Transmission characteristics for splices in cascade are also investigated.
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