Chapter 8: FIBER OPTIC COMMUNICATIONS EXAM QUESTIONS AND ANSWERS

Chapter 8: FIBER OPTIC COMMUNICATIONS EXAM QUESTIONS AND ANSWERS Fiber Optics - Answer- It is the science, study, or technology dealing with light transmission. Optical Fiber - Answer- It is the medium, channel or path where light signals travel. Alexander Graham Bell - Answer- In 1880 he experimented the transmission of sound waves over a beam of light using a device known as photophone. John Baird and Clarence Hansell - Answer- They were granted patents for scanning and transmitting television images through uncoated fiber cables. Heinrich Lamm - Answer- A German scientist successfully transmitted images through a single glass fiber. Abraham van Heel, Harold Hopkins, Narinder Singh Kapany - Answer- In 1950s they experimented with light transmission through bundles of fibers. Their study led to the development of flexible fiberscope. Narinder Singh Kapany - Answer- He coined the term fiber optics in 1956. He was from England who was regarded as the father of fiber optics. Charles Townes & Arthur Schawlow - Answer- They wrote a paper describing how it was possible to use stimulated emission of light waves as well as microwaves. Theodore Maiman - Answer- He built the first optical maser in late 50s. George Bockham and Charles Kuen Kao - Answer- They proposed a new communication medium using cladded fiber cables. Kapron, Keck, & Maurer - Answer- They are from Corning Glass Works in Corning, New York who developed an optical fiber with losses less than 2 dB/km. Core - Answer- It is the internal material of the fiber, specifically the central part of the fiber where the light propagates. Cladding - Answer- It is the material of lower refractive index that surrounds the core. Protective Coating - Answer- It is a special lacquer, silicone or acrylate coating that is generally applied to the outside of the cladding. Buffer Jacket - Answer- It surrounds the protective coating and provides the cable additional protection against abrasion and shock. Strength members - Answer- Encapsulates the buffer jacket which increases the tensile strength of the overall cable assembly. Polyurethane Outer Jacket - Answer- It is where the entire cable assembly is contained. PSP (Plastic-Clad-Plastic) - Answer- It is made up of a plastic core and a plastic cladding. PCS (Plastic-Clad-Silica) - Answer- It is made of a glass core and a plastic cladding. SCS (Silica-Clad-Silica) - Answer- It is made up of a glass core and glass cladding. Loose Tube Configuration - Answer- It is a cable configuration in which each fiber is contained in a protective tube; inside the tube, a polyurethane compound encapsulate the fiber which prevents the intrusion of water.