ABSTRACT
Light propagates in waveguides by virtue of repeated total internal reflections at the boundary surface. This chapter describes the polarization state which can be resolved into transverse electric (TE) and transverse magnetic (TM) polarizations. In multimode waveguides where the number of guided modes are numerous, the angle of propagation of the highest order mode is considered to be almost equal to the angle of total internal reflection. The chapter discusses the characteristics of the propagation of light within an optical waveguide. However, when using a signal transmission line such as optical fiber, the characteristics of the signal propagation in a time domain and frequency domain are important. The chapter provides the signal transmission characteristics of the multimode waveguide. The phase velocity can be defined when the single-frequency (monochromatic) waves continue infinitely; however, information cannot be sent as in the same case of direct current.
