ETA Fiber practice questions with 100% complete solutions

ETA Fiber practice questions with 100% complete solutions Light is electromagnetic energy with ____ frequency and a ______ shorter wavelength - Answer- Higher then shorter fiber optics transmission takes place in _____ portion of the light spectrum - Answer- IR A simple fiber optic System consist of what 4 parts - Answer- Transmitter, fiber optic cable, receiver, connecters What absolute power is Dbm referenced to - Answer- 1 milliwatt 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 communication thru optical fibers - Answer- 1550, 850, 1300 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 Multimode Fiber optic transmitters typically use what two low cost light sources - Answer- Led, VCSEL The typical numerical aperture for 50/125 I'm optical fiber is - Answer- .200 One way to reduce modal dispersion is to - Answer- Use a smaller core 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 connected pairs - Answer- Fresnel Reflections When light passes from one transparent medium to anther transparent medium that has a different refractive index the light wave bends this is called ? - Answer- Refraction What part of the multimode optical fiber has the lowest refraction index - Answer- Cladding Single-mode fiber has a _____ core compared to multimode fiber - Answer- Smaller Single mode systems usually operate at what three wavelengths - Answer- 1625, 1550, 1310 What are the two most common multimode wavelengths - Answer- 859, 1300 Attenuation (loss) is specified as - Answer- DB What is a "mode" in optical fiber - Answer- A light path Improper bending of optical fiber will do what to tensile strength - Answer- Decrease OM3 and OM4 multimode fibers are commonly known as _________ fibers - Answer- Laser optimized What are the two most common multimode optical fiber types - Answer- 62.5/125 50/125 Different wavelengths of light travel at _____ speeds through glass - Answer- Different The typical diameter for a fiber used in the tight-buffered cables is? - Answer- 900 microns In cordage what color signifies single-mode fiber? - Answer- Yellow In ANSI/TIA-589-C twelve colors comprise the fiber color code. What are the twelve in order ? - Answer- Blue, Orange, Green, Brown, Slate, White, Red, Black, Yellow, Violet, Rose, Aqua This fiber is designed be the ISO/IEC 11801 specification. The fibers designated as OM1 and OM2 are generally known as ______ fibers and were designed for use with led light sources - Answer- Legacy multimode Graded index fiber uses numerous concentric layers of glass to reduce _____ dispersion - Answer- Modal Which component of the connector is the optical fibers cladding typically bonded to during the assembly process? - Answer- Ferrel The NEC defines a fiber optic cable that is fire retardant and low smoke as a _____ rated cable - Answer- Plenum What is the color of commercial (non military) multimode cordage - Answer- Orange The gel/tape/powder in a loose tube/buffered fiber cable protects the optical fiber from ______ should the sheath or jacket fail - Answer- Water What does OFNR stand for - Answer- Optical fiber non conducti