ETA Fiber Optic Installer Certification exam 2023 with 100% correct answers

Light is electromagnetic energy with a _____ frequency and a _____ wavelength compared to radios. Higher; shorter What type of light is used in fiber optic transmissions? Infrared (IR) What are the four items needed for a fiber optic system to work? Transmitter, fiber optic cable, receiver, and connector 1 mW is the same as what in dBm? 0 dBm (absolute power) How is the power measured in fiber optics? dBm What fiber optic wavelength has the lowest loss? 1550 nm wavelength What wavelength windows are used most for fiber optic communications? 850 nm, 1300 nm, and 1550 nm wavelengths What year was fiber optic cable first used in commercial telephone systems in the U.S.? 1977 What light source is used for singlemode fiber? Laser diode What two light sources are used with multimode fiber? LED and VCSEL All wavelengths of light travel at the same speed. (true or false; why) False; different wavelengths of light travel at different velocities Which type of fiber has the larger core size: singlemode or multimode? Multimode