N-GEN Communications Web-based Seminars ©NGCS

Seminar - An Overview of Communications Technologies

Module 5 - SONET, WDM, DWDM and B-ISDN Technologies                                                                Slide 5 of 76 _________________                                                                                  __________

                                       Nature of Light Rays When They Pass
                                       From One Material to Other Material

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Light rays bend or change direction when they pass from one medium to other. They bend because the speed at which they travel in different media is different. How optical fibers work is explained by Snell's Law.