Fiber Optic Study Guide Final Exam Questions With Correct Answers

Higher and Shorter - Answer Light is electromagnetic energy with a _______ frequency and a _______ wavelength compared to radios Infrared (IR) - Answer What type of light is used in Fiber Optic transmissions? Transmitter Fiber Optic Cable Receiver Connector - Answer What are the 4 items needed for a fiber optic system to work? 0 dBM - Answer 1 mW is the same as what in dBM? dBM - Answer How is the power measured in Fiber optics? 1550 nm - Answer What fiber optic wavelength has the lowest loss? 1300, 1550, 850 - Answer What wavelengths windows are used most for communication in optical fibers? 1977 - Answer What year was fiber optic cable first used in commercial telephone systems in the U.S.? Laser-diode - Answer What light source is used for single mode fiber? LED and VCSEL - Answer What two light sources are used with multimode fiber? False, Different wavelengths of light travel at different velocities - Answer All wavelengths of light travel at the same speed. True o False. Why? Multimode - Answer Which type of fiber has the larger core size? Single mode or multimode? OSHA is responsible for enforcing it's standards on regulated entities - Answer What is OSHA responsible for? 1. USE A SMALLER CORE 2. Use Graded-index Fiber - Answer What are two ways to reduce modal dispersion? The Wavelength gets Shorter with more Modes. - Answer What happens to the wavelength in optical fiber when the number of modes increase? Air gaps and Mechanical Interconnections - Answer Where does Fresnel reflection occur? Refraction - Answer What is it called when light bends when moving between water and air? Core 1.457 and 1.471 Cladding 1.42 - Answer What is the refractive index of the core and cladding of optical fiber? 1310, 1550, 1625 - Answer Single-mode systems usually operate at what three wavelengths? 850 and 1300 - Answer What two multimode wavelengths are the most commonly used? Decibels (dB) - Answer How is attenuation measured? A light path. - Answer What is a "mode" in optical fiber? Decreases tensile strength - Answer What will happen to the tensile strength of a fiber cable if it is bent more than recommended? Laser-optimized multimode - Answer OM3 and OM4 multimode fibers are known as what type of fiber? 62.5/125ųm(US) 50/125ųm(EU) - Answer What are the two most common core and cladding sizes in multimode optical fiber? 900um - Answer The buffer size for a fiber used in tight-buffered cables is what? Yellow - Answer What jacket color does Single-mode fiber have? 1. Blue 2. Orange 3. Green 4. Brown 5. Slate 6. White 7. Red 8. Black 9. Yellow 10. Violet 11. Rose 12. Aqua - Answer Twelve colors comprise the fiber color code. What are they in order? Legacy multimode - Answer OM1 and OM2 are known as what types of fibers? Reduce model dispersion - Answer Why does graded index fiber use numerous concentric layers of glass? Ferrule connector - Answer What is the optical fiber's cladding bonded to during the assembly process? Plenum - Answer A fiber optic cable that is "fire retardant and low smoke" is called what according to the NEC?