The document discusses fiber optics and presents information on various topics related to fiber optic communication including: - A brief history of the development of fiber optics from 1968 to 1982. - The basic components and structure of an optical fiber including the core and cladding. - The advantages and disadvantages of using optical fibers for communication. - Different types of optical fibers used based on their core and cladding materials. - Sources of loss in optical fiber cables such as absorption, scattering, and bending. - Common light sources used in fiber optics like LEDs and lasers. - Detectors used to receive light signals including PIN diodes and APDs. - Optical amplifiers and their role in

10. OPTICAL FIBER LINK

13. ABSORPTION LOSSES IN OPTICAL FIBER Loss (dB/km) 1 0 0.7 0.8 Wavelength (  m) 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 2 3 4 5 6 Peaks caused by OH - ions Infrared absorption Rayleigh scattering & ultraviolet absorption