New PDF release: An Introduction to Fiber Optics

By Ajoy Ghatak

ISBN-10: 0521577853

ISBN-13: 9780521577854

Contemporary advances within the improvement of low-loss optical fibers have revolutionized the sector of telecommunications, and fiber-based networks shape a key a part of foreign communications structures. This e-book introduces the actual rules of optical fibers, and info their use in sensor expertise and glossy optical conversation platforms. The authors commence by means of starting up the fundamental propagation features of unmarried mode and multimode optical fibers. In later chapters they conceal optical resources, optical detectors, and fiber-optic communique method layout. additionally they deal with a large choice of similar subject matters similar to doped fiber amplifiers, dispersion repayment, fiber sensors, and size ideas for the characterization of optical fibers. through the publication, actual and engineering elements of the topic are interwoven, and lots of labored examples and routines are incorporated. it will likely be a terrific textbook for undergraduate or graduate scholars taking classes in optical fiber communications, photonics, or optoelectronics.

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Extra resources for An Introduction to Fiber Optics

Example text

We assume that the light in the guide propagates in the z direction, that confinement occurs transversely in the x direction, and that both the structure and the light are uniform in the y direction perpendicular to x z. Our physical picture of guided light propagation is, then, that of light traveling in zig-zag fashion X COVER z SUBSTRATE Os Fig. 5. Side-view of a slab waveguide showing wave normals of the zig-zag waves corresponding to a guided mode through the film. More precisely, it is a picture of two superimposed uniform plane waves with wavenormals which follow the zig-zag path indicated in the figure and which are totally reflected at the film boundaries.

II I 5 4 / / / / 3 2 3 4 I 5 6 V : kh( nf2_ n 5 2 l~ Fig. 11. 13]. In Fig. 11, we note the occurence of minimum values of H(V), for which we obtain maximum confinement of the light. 55. 3. 2. Fundamentals of the Electromagnetic Theory of Dielectric Waveguides In this section we propose to collect the, by now well developed, fundamentals of the electromagnetic theory of dielectric waveguides, and to discuss some of the general properties of the waveguide modes. This includes a listing of the relevant forms of Maxwell's equations and of the wave equations, a deduction of modal field properties following from symmetry considerations, a proof for the orthogonality of the modes, and a discussion of mode expansion and normalization, of the variation theorem, of power transport and stored energy, and of variational principles applicable to dielectric waveguides.

Fig. 6. Sketch of graphical solution of the dispersion equation for the fundamental modes of symmetric and asymmetric slab waveguides curve). Consider the symmetric guide first, where the intersection between the solid and the dotted curve yields the zig-zag angle 8 of the fundamental mode. We note that the zig-zags get steeper (8 smaller) as h/A. gets smaller, but there is always a solution even when the film thickness gets very small. This implies that there is no cutoff for the fundamental mode of a symmetric guide.

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An Introduction to Fiber Optics by Ajoy Ghatak


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