ETA Fiber Optic Installer Certification - Study Guide 2024

ETA Fiber Optic Installer Certification - Study Guide 2024 Light is electromagnetic energy with a _____ frequency and a _____ wavelength compared to radios. - Answer ️️ -Higher; shorter What type of light is used in fiber optic transmissions? - Answer ️️ -Infrared (IR) What are the four items needed for a fiber optic system to work? - Answer ️️ -Transmitter, fiber optic cable, receiver, and connector 1 mW is the same as what in dBm? - Answer ️️ -0 dBm (absolute power) How is the power measured in fiber optics? - Answer ️️ -dBm What fiber optic wavelength has the lowest loss? - Answer ️️ -1550 nm wavelength What wavelength windows are used most for fiber optic communications? - Answer ️️ -850 nm, 1300 nm, and 1550 nm wavelengths What year was fiber optic cable first used in commercial telephone systems in the U.S.? - Answer ️️ -1977 What light source is used for singlemode fiber? - Answer ️️ -Laser diode What two light sources are used with multimode fiber? - Answer ️️ -LED and VCSEL All wavelengths of light travel at the same speed. (true or false; why) - Answer ️️ -False; different wavelengths of light travel at different velocities Which type of fiber has the larger core size: singlemode or multimode? - Answer ️️ - Multimode What is OSHA responsible for? - Answer ️️ -OSHA is responsible for enforcing it's standards on regulated entities What are two ways to reduce modal dispersion? - Answer ️️ -Use a smaller core; use graded- index fiber What happens to the wavelength in fiber when the number of modes increase? - Answer ️️ - The wavelength gets shorter with more modes Where does Fresnel reflection occur? - Answer ️️ -Air gas and mechanical interconnections What is it called when light bends when moving between water and air? - Answer ️️ - Refraction What is the refractive index of the core and cladding of fiber? - Answer ️️ -Core - 1.457 and 1.451; cladding - 1.42 Singlemode fiber systems usually operate at what three wavelengths? - Answer ️️ -1310 nm, 1550 nm, and 1625 nm wavelengths What two multimode wavelengths are the most commonly used? - Answer ️️ -850 nm and 1300 nm wavelengths How is attenuation measured? - Answer ️️ -Decibels (dB) What is a "mode" in fiber? - Answer ️️ -A path of light What will happen to the tensile strength of a fiber cable if it is bent more than recommended? - Answer ️️ -The tensile strength decreases OM3 and OM4 multimode fibers are known as what type of fiber? - Answer ️️ -Laser optimized multimode fib