Fiber Exam Questions and Answers 100% Pass

Fiber Exam Questions and Answers 100% Pass What is the difference between light and radio freq? - Answer- Light uses high freq Radio uses short freq What type of light is used in Fiber Optic Transmissions? - Answer- Infrared Light What are the 4 items needed for a fiber optic system to work? - Answer- Transmitter, fiber optic cable, receiver, connectors. 1 mW is the same as what in dBM? - Answer- 0 dBM How is power measured in fiber optic - Answer- dBM What is the best wavelength to use in fiber optic transmissions? - Answer- 1550 nm What wavelengths are most used for communications in fiber optics? - Answer- Multimode- 850 nm, 1300 nm Singlemode- 1550 nm When ws fiber optic cable first used for commercial telephones in the United States? - Answer- GTE 1977 When using single mode fiber optic cable what is the best light source to use? - Answer- Laser Diode (LD) What are the two cheapest light sources used in fiber optics? - Answer- Light Emitting Diode (LED) Vertical Cavity Surface Emitting Laser (VCSEL All wavelengths of light travel at the same speed. True or False. Why? - Answer- False, Different freq's travel at different speeds. Which has the larger core single mode or multimode fiber? - Answer- Multimode The typical numerical aperture (NA) for a 50/125 um optical fiber is? - Answer- .200 Which cable has more modal dispersion single mode or multimode? - Answer- multimode What happens to the wavelength in fiber when more light paths are made? - Answer- Modal Dispersion When does Fresnal Reflection occur? - Answer- Caused by a step change in the refractive index that occurs at fiber joint What is it called when light waves bends between air and water? - Answer- Refraction Where are minor defects allowed in optical fibers? - Answer- Outer Cladding What is the coating on the fiber optic core called? - Answer- Cladding Which is more dense the core or cladding? - Answer- Cladding What are the wavelengths used in single mode fiber? - Answer- 1310 nm, 1550 nm, 1625 nm What wavelength are most used in multimode fiber? - Answer- 850 nm, 1300 nm What measurement is used to identify loss in fiber optic cable? - Answer- dB The path light takes along the fiber is also referred to as what? - Answer- Modes What will happen to the strength of a fiber cable if you bend it more than is advised? - Answer- Decrease tensile strength What is the most important requirement for making a good splice? - Answer- Precision cleaving tool Most singlemode fiber ends are terminated onto factory made _____ and spliced to the fiber cable. - Answer- Pigtail If a hot melt connector is cracked or not properly polished what type of loss will occur? - Answer- Extrinsic Loss The splicing environment must be kept as ______ as possible. - Answer- Clean Fresnel Reflection is reduced in mechanical splices by using what? - Answer- Index Matching Gel This termination technique depends on the quality of the c