Fiber Class Exam Questions and Answers 100% Pass

Fiber Class Exam Questions and Answers 100% Pass Light is electromagnetic energy with a ____________ frequency and a ___________ wavelength compared to radio waves. - Answer- Higher/Shorter Fiber optic transmission takes place in the ___________ portion of the light spectrum. - Answer- Infrared A simple fiber optic system would consist of what 4 parts? - Answer- Transmitter/Fiber optic Cable/Receiver/Connector What absolute power value is zero dBm referenced to? - Answer- 1 miliwatt Absolute power in optical fiber is specified as: - Answer- dBm Attenuation in optical fiber is lowest at what wavelength _________ - Answer- 1550 What are the three most common wavelength windows used for communications through optical fibers? - Answer- 850/1300/1550 In North America what year was the first fiber optic telephone system installed? - Answer- 1977 Single-mode fiber optic systems typically use what light source? - Answer- Laser Diode Multi-mode fiber optic transmitters typically use what two low cost light sources? - Answer- LED / VCSEL Different wavelengths of light travel at ___________ speeds through the glass. - Answer- different Single-mode fibers have a _______________ core compared to multi-mode fibers. - Answer- smaller The typical numerical aperture (NA) for a 50/125 um optical fiber is? - Answer- .200 One way to reduce modal dispersion is to? - Answer- use a smaller core(single mode) The number of modes in an optical fiber increases as the ________________ decreases. - Answer- wavelength What optical effect is produced by all mechanical interconnections whether mechanical splices or mated connector pairs? - Answer- Fresnel Reflections When light passes from one transparent medium to another transparent medium that has a different refractive index the light waves bends. This is called _______________ - Answer- Refraction Which part of the multi-mode optical fiber cable has the lowest refractive index? - Answer- Cladding Single-mode systems usually operate at what three wavelengths? - Answer- 1310 / 1550 / 1625 What are the two most common multi-mode wavelengths? - Answer- 850 / 1300 Attenuation (loss) is specified as: - Answer- loss of power expressed as decibles What is a "mode" in optical fiber? - Answer- Light path Improper bending of an optical fiber will do what to the tensile strength? - Answer- decrease OM3 and OM4 multi-mode fibers are commonly known as_____________ fibers. - Answer- laser optimized multi-mode What are the two most common multi-mode optical fiber types? - Answer- 62.5/125um and 50/125um The typical coating diameter for a fiber used in tight-buffered cables is? - Answer- 900um In cordage what color signifies single-mode fiber? - Answer- yellow