Fiber Optics (Light Brigade) Exam Questions and Answers 100% Pass

Fiber Optics (Light Brigade) Exam Questions and Answers 100% Pass When was the first North American commercial fiber optic system installed? - Answer- 1977 What is a mode in an optical fiber? - Answer- Path What are the "three Cs" of an optical fiber? - Answer- Core, Cladding, Coating What are the three critical factors to be considered when working with a fiber optic network? - Answer- Attenuation, Dispersion, Reflection What does the acronym ITU represent? - Answer- International Telecommunication Union what are the two most commonly used sizes of multimode cores? - Answer- 50um, 62.5um What unit of measurement is used to measure and express wavelengths? - Answer- nm - nanometer what unit of measurement is used to denote the size of a fiber's core, cladding, and coating? - Answer- um - microns what are the outside diameters of single-mode and multimode claddings? - Answer- 125um What effects are optical fibers immune to? - Answer- Electrical, Radio what are the three primary wavelength windows in a fiber optic system? - Answer- 850, 1300, 1550 which wavelength has the lowest attenuation? - Answer- 1550 what part of the electromagnetic spectrum is used by fiber optic systems? - Answer- Infrared Does light have a higher or lower frequency that radio waves? - Answer- Higher frequency Does light waves have a longer or shorter wavelength than radio waves? - Answer- Shorter wavelength what is the bending of light called? - Answer- Refraction what type of reflection is caused by an air gap in a connector pair? - Answer- Fresnel reflection what are the three ways to reduce modal dispersion in a multimode system? - Answer- graded index fiber, smaller core, longer wavelength True or False: All wavelengths travel at the same speed through the fiber. - Answer- False What are the two most common multimode wavelengths? - Answer- 850, 1300 What type of loss will a poor cleave angle cause: intrinsic or extrinsic? - Answer- Extrinsic The acronym IOR is the ratio of speed of light in a vacuum versus the speed of light in what? - Answer- Glass What term defines defects that result from poor polishing, fiber misalignment, poor cleave angles, and poor cleaning practices? - Answer- Extrinsic True or False: 80% of the light travels in the core of a single-mode fiber and 20% travels in the inner cladding that is defined as the mode field diameter. - Answer- True