Description : Band loss is ∙ a. A reduction in transmitter power caused by earth’s surface curvature ∙ b. A reduction in strength of the signal caused by folded dipole bends ∙ c. An attenuation increase caused by bends radiating from the side of the fiber ∙ d. All of these
Last Answer : c. An attenuation increase caused by bends radiating from the side of the fiber
Description : These bends are caused by excessive pressure and tension and generally occur while fiber are bent during handling or installation. ∙ A. microbending ∙ B. macrobending ∙ C. constant-radius bending ∙ D. kinks
Last Answer : C. constant-radius bending
Description : These bends are caused by excessive pressure and tension and generally occur while fiber are bent during handling or installation.
Last Answer : constant-radius bending
Description : How does index matching gel affect the amount of coupling loss caused by (a) fiber separation, (b) lateral misalignment, and (c) angular misalignment?
Last Answer : (a) Reduces coupling loss, (b) does not change coupling loss, and (c) increases coupling loss
Description : Which types of LEDs are the preferred optical sources for short-distance, low-data-rate fiber optic systems?
Last Answer : SLEDs and ELEDs.
Description : List the three basic errors that occur during fiber alignment.
Last Answer : Fiber separation (longitudinal misalignment), lateral misalignment, and angular misalignment.
Description : List the three parts of an optical fiber.
Last Answer : Core, cladding, and coating or buffer.
Description : List the three parts of a fiber optic data link
Last Answer : Transmitter, optical fiber, and receiver.
Description : Scattering losses are caused by the interaction of light with density fluctuations within a fiber. What are the two scattering mechanisms called when the size of the density fluctuations is (a) greater than and (b) less than one-tenth of the operating wavelength?
Last Answer : . (a) Mie scattering; (b) Rayleigh scattering.
Description : Explain with neat sketch block diagram of optical fiber communication system and list out sources and detectors suitable for it.
Last Answer : OR 1. The light source is normally an infrared LED or LASER device which is driven by the current value from the V to I convertor. It emits light which is proportional ... optical energy electrical signal. The light detectors which are used as PIN photodiode and avalanche photo diode.
Description : Which of the following pipe bends will incur the largest head loss? (A) U-bend (B) 30° bend (C) 45° bend (D) 90° bend
Last Answer : (A) U-bend
Description : If h is the loss due to friction in a pipe. Total losses in strainer and bends may be taken as (A) 0.01 h (B) 0.45 h (C) 0.20 h (D) 0.25 h
Last Answer : Answer: Option D
Description : the loss due to friction in pipes is 4 m, the total losses in strainer and bends may be taken as (A) 0.10 m (B) 0.20 m (C) 0.5 m (D) 1.0 m
Description : Is coupling loss from fiber separation and lateral misalignment more critical in expanded-beam or butt-jointed connectors?
Last Answer : Butt-jointed connectors.
Description : Does coupling loss from refractive index profile difference result when the receiving fiber has a larger profile parameter
Last Answer : Fiber alignment.
Description : What connection properties result in fiber optic connector coupling loss?
Last Answer : Poor fiber alignment and end preparation, fiber mismatches, and Fresnel reflection.
Description : What fiber property directly affects splice loss in fusion splicing?
Last Answer : The angles and quality of the two fiber-end faces.
Description : Fiber-to-fiber coupling loss is affected by intrinsic and extrinsic coupling losses. Can intrinsic coupling losses be limited by limiting fiber mismatches?
Last Answer : Yes.
Description : Give two reasons why optical fiber manufacturers depart from the traditional circular core and cladding, low-loss glass fiber design?
Last Answer : To increase performance and reduce cost
Description : While coupled power and bending loss favor a high D, which Dvalue, smaller or larger, improves fiber bandwidth?
Last Answer : Smaller.
Description : Will fiber coupling loss generally increase or decrease if the mode field diameter of a single mode fiber is decreased?
Last Answer : Increase.
Description : Which type of optical fiber (multimode or single mode) tends to have lower loss and produces less signal distortion?
Last Answer : Single mode fiber.
Description : In 1969, what did several scientists conclude about optical fiber loss?
Last Answer : mpurities in the fiber material caused the signal loss in optical fibers. The basic fiber material did not prevent the light signal from reaching the end of the fiber.
Description : List six types of fiber mismatches.
Last Answer : Core diameter mismatch, cladding diameter mismatch, core ellipticity, core and cladding concentricity differences, NA mismatch, and refractive index profile differences.
Description : List five common fiber optic transmitter packages.
Last Answer : TO can, DIP, butterfly lead microcircuits, circuit cards, and stand-alone optical fiber converters.
Description : List the two principal optical detectors used in fiber optic systems.
Last Answer : The semiconductor positive-intrinsic-negative (PIN) photodiode and avalanche photodiode (APD).
Description : List the types of fiber optic components considered part of a fiber optic cable plant.
Last Answer : Optical fiber cables, connectors, splices, mounting panels, jumper cables, and other passive components.
Description : List the fiber geometrical measurements performed in the laboratory.
Last Answer : Cladding diameter, core diameter, numerical aperture, and mode field diameter.
Description : List five precautions to take when installing fiber optic systems on board naval ships.
Last Answer : a. Never bend an optical fiber or cable at a radius of curvature less than the minimum bend radius. b. Never pull fiber optic cables tight or fasten them over or through sharp corners or ... the hardware. e. Allow only trained, authorized personnel to install or repair fiber optic systems.
Description : List four system topologies that can be constructed using point-to-point fiber optic links.
Last Answer : Linear bus, ring, star, and tree topologies.
Description : List seven advantages of fiber optics over electrical systems.
Last Answer : Advantages of fiber optics are improved system performance, immunity to electrical noise, signal security, electrical isolation, reduced size and w
Description : Losses caused by skin effect and the I2R (power) loss are classified as what type of loss?
Last Answer : Copper losses.
Description : What are the three parts of a fiber optic transmitter?
Last Answer : Interface circuit, source drive circuit, and an optical source.
Description : Modal dispersion affects the bandwidth of multimode systems. It is essential to adjust what three fiber properties to maximize system bandwidth?
Last Answer : Core diameter, NA, and index profile properties.
Description : Most fiber optic light sources emit light in which spectrum? ∙ A. visible ∙ B. infrared ∙ C. ultraviolet ∙ D. X-ray
Last Answer : B. infrared
Description : Most fiber-optic light sources emit light in which spectrum? ∙ a. Visible ∙ b. Infrared ∙ c. Ultraviolet ∙ d. X-ray
Last Answer : ∙ b. Infrared
Description : List the types of materials used in fabricating low-loss, long wavelength optical fibers.
Last Answer : Heavy-metal fluorides, chalcogenide glasses, and crystalline materials.
Description : Motors, switches, voltage regulators, generators, etc., are a few examples of emi sources. What type of emi comes from these sources?
Last Answer : Man-made.
Description : Thunderstorms, snowstorms, cosmic sources, the sun, etc., are a few examples of emi sources. What type of emi comes
Last Answer : Natural.
Description : What are the two main sources of emi with which radio waves must compete?
Last Answer : Natural and man-made interference.
Description : Which semiconductor sources (LD or LED) emit more focused light and are capable of launching sufficient optical power into both single mode and multimode fibers?
Last Answer : LDs.
Description : What are four sources that can cause magnetic heads to become magnetized?
Last Answer : a. During ac power losses. b. During testing. c. Because of stray magnetic fields. d. From normal use.
Description : Compare the power sources of synchros and step transmission systems.
Last Answer : Synchros use ac; step transmission uses dc.
Description : What meters operate from their own power sources?
Last Answer : Self-excited.
Description : How to draw out a microscopic splinter!
Last Answer : answer:Duct tape! No, really…. put some tape over it and then quickly pull it off. The tape will adhere to the little sticker and they usually come out when you rip the tape off. Chalk up another one for the wisdom of grandma’s home remedies.
Description : When very tiny microscopic fragile things fall from microscopic heights, do they break?
Last Answer : answer:Not usually. They don’t fall far enough to build sufficient momentum. It is also because they are so light, their terminal velocity is relatively low; an ant could fall off of the Empire State Building and walk away.
Description : Microscopic structure having plar nuclei is
Last Answer : Microscopic structure having plar nuclei is A. Pollen tube B. Embryo sac C. Pollen grain D. Male gemete
Description : Who is founder of microscopic anatomy : -
Last Answer : Who is founder of microscopic anatomy : -
Description : In aquatic environment, microscopic animals and plants are collectively known as
Last Answer : In aquatic environment, microscopic animals and plants are collectively known as A. Commensals B. Herbivores C. Fauna and Flora D. Planktons