Download Fundamentals of optical waveguides by Katsunari Okamoto PDF
By Katsunari Okamoto
Basics of Optical Waveguides is a necessary source for any researcher, specialist or scholar fascinated about optics and communications engineering. Any reader attracted to designing or actively operating with optical units should have a company take hold of of the foundations of lightwave propagation. Katsunari Okamoto has provided this tough expertise essentially and concisely with a number of illustrations and equations. Read more...
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Then the electric field amplitude A m is obtained from Eq. 118) as Am -- -W J-w/2 , ( x ) cos T x - --~ dx. 119) For simplicity, we consider the case in which the input single-mode waveguide is connected to the center of the multimode waveguide. In this condition, modes in MMI region become only symmetrical modes; that is, m becomes an even number m - 2 s (s At the point Z-neffW2/h, the phase term in Eq. 118) reduces to 4neffW 2 z --exp j s 1 6 3 1 ) ' r r + j ~ =exp (j~-). 121) The electric field profile at the MMI length LMMI is then obtained from Eq.
Chapter 3 Optical Fibers Silica-based optical fibers are the most important transmission medium for long-distance and large-capacity optical communication systems. The most distinguished feature of optical fiber is its low loss characteristics. 55-1xm wavelength [1]. This means that the signal intensity of light becomes half of the original strength after propagating 20 km along the optical fiber. Together with such low loss properties, low dispersion is also required for signal transmission. Signal distortion due to dispersion of the fiber is closely related to the guiding structure of optical fibers.
H. Verbeek. 1992. An optical passive 3-dB TMI-coupler with reduced fabrication tolerance sensitivity. IEEE J. Lightwave Tech. 10:306-311. , P. A. Besse and H. Melchior. 1994. General self-imaging properties in N x N multimode interference couplers including phase relations. Appl. Opt. 33:3905-3911. Heaton, J. M. and R. M. Jenkins. 1999. General matrix theory of self-imaging in multimode interference (MMI) couplers. IEEE Photon. Tech. Lett. 11:212-214. Soldano, L. B. and E. C. M. Pennings. 1995.