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Linearly Polarized (LP) Optical Fiber Modes. It is customary in the theory of optical fibers to make the “weakly guiding approximation” n1 = n2 (the refractive index of the core equal the refractive index of the cladding) because: It simplifies the characteristic equation for the modes.
8.1 STEP-INDEX FIBERS A step-index fiber is a cylindrical dielectric waveguide specified by its core and cladding refractive indices, ~zr and n2, and the radii a and b (see Fig. 8.0-l). Examples of standard core and cladding diameters 2a/2b are S/125, 50/125, 62.5/125, 85/125, 100/140 (units of pm).
Lecture 6 - Propagation in Optical Fibers and Dispersion Non-Linear Schrodinger Equation. Both linear (dispersive) and nonlinear effects must be taken into account for pulse propagation in the fiber.
For each LP mode, the two parameters are related. λc(lm) = (2πa/(Vc(lm)) (n1 2 – n2 2)1/2. The range of wavelengths over which mode lm will propagate is thus 0 < λ < λc(lm). For a fiber to operate single mode, the operating wavelength must be longer than the cutoff wavelength for the LP11 mode.
In this section, we define the quantities and functions that specify the refractive index profile. In general, the refractive index depends both on the distance {! from the fiber axis, and the azimuth angle l/J (Fig. 3.1), e.g. for fibers with elliptical core.
9 maj 2012 · Parameters such as the core radius, the graded-index exponent, length and the core refractive index count for this matter. Nevertheless, the most critical parameter that define the behaviour and performance of a graded-index optical fiber type is its refractive index profile α. It should be outlined that this index profile may slightly vary ...
17 sie 2018 · In particular: a step-index profile fiber for g = ∞, a parabolic profile fiber for g = 2 and a triangular profile fiber for g = 1. For all considered fiber designs, the refractive index...
