Download JATC Fiber Optics Final Exam Q&A | Verified 100% Correct | Latest 2026/2027 Version and more Exams Engineering in PDF only on Docsity!
JATC Fiber Optics Final | Actual Exam
Questions | 100% Correct Answers |
Verified 202 6 Version
Fiber optics is used in cars to connect their electronic systems. - ✔✔True Copper networks can be converted to fiber optics using _____. - ✔✔Media converters Telephone networks have been converted to fiber, including long distance and metropolitan networks, but fiber to the home (FTTH) is not yet feasible. - ✔✔False Which of the following communication systems typically use fiber-optic backbones? - ✔✔
- CATV
- Cell phones
- Telephones
- Internet In an industrial environment, fiber is most often used to _____. - ✔✔Prevent electromagnetic interference An advantage of optical fiber is the fact that it is the most cost effective means of transporting information over long distances. - ✔✔True The bandwidth and distance capability of optical fiber means that _____. - ✔✔
- Less maintenance is required
- Fewer repeaters are needed
- Fewer cables are needed
- Less power is consumed by the network
The protective gear every voice/data/video (VDV) installer must always wear is _____. - ✔✔Eye protection Information on the safety of chemicals used in fiber optics are _____. - ✔✔In MSDS supplied by the manufacturer. Inspection microscopes can concentrate the light from a fiber into your eye causing serious damage. - ✔✔True Bright red visible light is produced by a VFL that is safe to look at directly at the end of the fiber. - ✔✔False A digital camera can see infrared light, so it can be used to determine if there is light present in a fiber. - ✔✔True Dangerous light from fiber optic cables is bright and easily visible. - ✔✔False During fiber optic installations, the most common danger is caused by _____. - ✔✔Fiber scraps or shards by cleaving, splicing, and termination. If you inspect a fiber optic connector that is connected to a laser source with a microscope, you will experience a high level of pain while your eye is damaged. - ✔✔False What are some potential hazards associated with the use of cleaning solvents that are sometimes used when working with fiber optics? - ✔✔- Vapors
- Skin irritation To ensure that you are using proper protective eyewear, look for the _____ mark on your glasses. - ✔✔- ANSI Z Proper eyewear should include _____ for maximum protection from flying debris. - ✔✔- Side shields
The diameter of an optical fiber is traditionally measured in _____/_____. - ✔✔- Microns/micrometers Multimode fiber systems operation at speeds of 1 gigabit per second or more for short lengths use _____. - ✔✔- Vertical cavity surface emitting lasers (VCSELs) LED light sources have a very _____ spectra, while laser light sources have a very _____ spectra. - ✔✔- Broad
- Narrow What wavelengths would an F-P laser light source used for SM operate at for transmission over fiber optic cabling? - ✔✔1300 and 1550 nm What wavelengths are appropriate for use with MM fiber? - ✔✔850 and 1300 nm What wavelengths are appropriate for use with SM fiber? - ✔✔1310 and 1550 nm Light-emitting diodes (LEDs) have higher output power and bandwidth than lasers. - ✔✔False An F-P laser light source emits its light from the _____ of the microchip. - ✔✔- Side The light source best matched for a multimode fiber link operating at less than 100MB/s would be an _____. - ✔✔- LED Loss of a fiber or any fiber in a cable is measured in _____. - ✔✔- dB In multimode fiber, the attenuation of the fiber is _____ at 850 nm than at 1300nm. - ✔✔- Higher "The reduction in optical power as it passes along a fiber" is known as _____. - ✔✔- Attenuation
Scattering _____ quickly at longer wavelengths. - ✔✔- Decreases The largest contributor to fiber attenuation is _____. - ✔✔- Scattering At specific wavelengths, _____ occurs a high levels. - ✔✔- Absorption What are the two main factors that cause attenuation in fiber optics? - ✔✔Scattering and absorption The design of _____ MM fiber compensates for modal dispersion. - ✔✔- Graded index _____ light sources have a broad spectrum, suffering more chromatic dispersion than _____ light sources. - ✔✔- LED
- Laser Which type of dispersion affects SM fiber as well as MM fiber? - ✔✔Chromatic The speed of light varies with wavelength, which causes _____. - ✔✔- Chromatic dispersion SM fiber has _____ bandwidth than MM fiber. - ✔✔- More The _____ of a laser makes the effective bandwidth of MM fiber higher than LEDs. - ✔✔- Restricted launch What is caused by varying speeds in each mode in multimode fiber? - ✔✔- Modal dispersion Fiber bandwidth is limited by _____. - ✔✔- Dispersion The proper method of pulling optical fiber cables is to attach the pull wire or tape to the _____ of the cable. - ✔✔- Strength members
Fiber optic cable for use inside a building must be _____. - ✔✔- Rated to meet the requirements of local building and fire codes What type of fiber cable design allows for large numbers of fibers with ultra-high density, small size (diameter) and low cost? - ✔✔Ribbon cable Premises cable jackets are usually color-coded in what color to indicate laser-optimized 50/125 OM3 or OM4 fiber? - ✔✔Aqua Hybrid cables are cables that contain both _____. - ✔✔- SM and MM fiber Composite cables refer to cables that contain both _____. - ✔✔- Optical fibers and copper conductors What connector color typically identifies an SM APC? - ✔✔Green The SC and LC connectors have different size ferrules and cannot be mated. - ✔✔True The difference between a fiber-optic connector and a splice is _____. - ✔✔- Connectors are demountable, splices are permanent Which of the following connector types uses an 8 degree angle to prevent singlemode reflectance? - ✔✔APC You may see other connector colors outside of the typical ones, especially for multimode. - ✔✔True The connector with the best or lowest reflectance would be the _____. - ✔✔- SC-APC What connector color is typically used to identify multimode? - ✔✔Beige What connector color is typically used to identify singlemode? - ✔✔Blue
Fiber optic joints (connectors or splices) should have _____, _____, and _____. - ✔✔- Low loss
- Minimal reflectance
- High mechanical strength Physical contact (PC) polish on connectors is designed to reduce _____. - ✔✔- Loss and reflectance When terminating fiber, what is used to precisely "break" the fiber to produce a flat end for polishing or splicing? - ✔✔Cleaver When preparing a fiber for termination, what is stripped off of the fiber before placing it within a connector? - ✔✔Primary buffer coating A _____ is a hard, sharp tool that scratches the fiber to allow cleaving. - ✔✔- Scribe Before terminating a fiber optic connector, make sure to slide the _____ onto the cable. - ✔✔- Boot When injecting epoxy into a connector, how do you know when you have injected enough? - ✔✔A small bead of the epoxy will be seen coming out of the end of the ferrule What is the first step when polishing an adhesive termination? - ✔✔"Air polish" to grind down the cleaved fiber What should you reference in order to strip the fiber, buffer, and strength members to the right length? - ✔✔Manufacturer's packaging instructions What is needed to get low loss from pre polished splice connector? - ✔✔Good initial cleave The manufacturing process of pre-polished connectors is complex and requires extra care, so these connectors are as much as 10 times the amount of an adhesive-and-polish type. - ✔✔True
In a basic fiber optic system, the transmitter converts a _____ signal into a _____ signal. - ✔✔- Electrical
- Optical The amount of optical power lost as light is transmitted through fiber, splices, and couplers is defined as _____. - ✔✔- Optical loss Connectors at each end of the cable plant should not be counted when calculating the cable plant loss. - ✔✔False What component can convert an electrical signal to or from an optical signal? - ✔✔Tranceiver Fiber optic links generally use two fibers for full duplex (bidirectional) links. - ✔✔True A fiber optic power meter measures absolute power in dBm (dB referenced to 1 mw) and, when used with a light source, can measure insertion loss expressed in dB. - ✔✔True A visible light source (LED or flashlight) used to visually check fiber continuity and location of faults is called a _____. - ✔✔- Fiber tracer What is used to inspect the end surface of a connector for faults such as scratches, polish, or dirt? - ✔✔Inspection microscope What fiber optic test simulates actual system operation? - ✔✔Optical Loss Test Set (OLTS) What test instrument(s) are used for insertion loss testing? - ✔✔OLTS or power meter and light source Inspection of fibers with an Interferometer is a common field test of fiber optics that is done before plugging into equipment. - ✔✔False
Connector "dust caps" can transfer dirt onto a fiber optic connector. - ✔✔True The infrared light coming out of a fiber optic cable is invisible, but if you look at it through a cell phone camera it is visible. - ✔✔True A fiber optic inspection microscope can increase the danger of high powered light sources by focusing the light coming out of a fiber into your eye. - ✔✔True The standard method of testing installed MM cables in a cable plant is described in _____. - ✔✔- OFSTP- 14 Cable plant loss should be estimated during the _____ phase. - ✔✔- Design Prior to cable plant acceptance or system turn-up, a _____ is used to measure the cable plant insertion loss to ensure it is within the loss budget. - ✔✔LSPM-OLTS For insertion loss testing, the fiber optic test source MUST match the both _____ and _____ of the transmission system or the standards covering the cable plant. - ✔✔- Fiber type
- Wavelength MM graded index glass fiber optic cables are tested with _____ sources at _____ and _____ wavelengths. - ✔✔- LED
- 850 nm
- 1300 nm SM fiber optic cables are tested with _____ sources at _____ and _____ wavelengths. - ✔✔- Laser
- 1310 nm
- 1550 nm According to the text, it is recommended that reference test cables be chosen for their _____. - ✔✔- Low loss
What type of network architecture utilizes connections that "tap" into a cable that is usually coax? - ✔✔Bus topology The Internet is an example of what type of network architecture? - ✔✔Mesh topology Telephone systems and LAN's commonly use ____ networks. - ✔✔- Star The essence of any network is that the network shares connections and thereby shares the available _____. - ✔✔- Bandwidth What network device replaced a hub, making full duplex data transfer possible? - ✔✔Switches What caused bandwidth to be limited on bus networks when too many users were using it at the same time? - ✔✔Collisions
