Description : If the length of the fiber point defect changes with pulse duration, is the OTDR signal deviation a point defect or a region of high fiber attenuation?
Last Answer : A point defect.
Description : What two properties of the launch condition may affect multimode fiber attenuation measurements?
Last Answer : . Launch spot size and angular distribution.
Description : When is an optical power meter measurement recommended for conducting field measurements on installed optical fiber cables or cable plants?
Last Answer : When an installed optical fiber cable or cable plant is less than 50 meters in length.
Description : in multimode fibers, how do fiber joints increase fiber attenuation following the joint?
Last Answer : By disturbing the fiber's mode power distribution (MPD).
Description : Which of the following is determined by an OTDR? ∙ a. Distance to trouble ∙ b. Length of fiber ∙ c. Refractive index ∙ d. All of these
Last Answer : d. All of these
Description : What is a temporary or permanent local deviation of the OTDR signal in the upward or downward direction called?
Description : Why do end users perform fiber geometry measurements in the laboratory?
Last Answer : To reduce system attenuation and coupling loss resulting from poor fiber fabrication.
Description : List the fiber geometrical measurements performed in the laboratory.
Last Answer : Cladding diameter, core diameter, numerical aperture, and mode field diameter.
Description : When the wave travels in a conducting medium, the rate of attenuation is decided by
Last Answer : When the wave travels in a conducting medium, the rate of attenuation is decided by Both attenuation constant and phase constant
Description : The frequency response of test equipment refers to what aspect of ac voltage measurements?
Last Answer : the range of frequencies that can accurately be measured.
Description : The loss in signal power as light travels down a fiber is called a. Dispersion b. Scattering c. Absorption d. Attenuation
Last Answer : d. Attenuation
Description : Loss due to the diffraction of light when it strikes on the irregularities formed during the manufacturing process of the fiber optics. A. Absorption loss B. Attenuation C. Bending loss D. Rayleigh scattering loss
Last Answer : D. Rayleigh scattering loss
Description : ECE Board Exam November 1996 The loss in signal power as light travels down a fiber is A. attenuation B. propagation C. absorption D. scattering
Last Answer : A. attenuation
Description : The loss in signal power as light travels down the fiber is called a. attenuation b. progragation c. scattering d. interruption
Last Answer : attenuation
Description : The loss in signal power as light travels down the fiber is called ............. A) Attenuation B) Propagation C) Scattering D) Interruption
Last Answer : A) Attenuation
Description : The term power budgeting refers to ∙ A. the cost of cable, connectors, equipment and installation ∙ B. the loss of power due to defective components ∙ C. the total power available minus the attenuation losses ∙ D. the comparative costs of fiber and copper installations
Last Answer : C. the total power available minus the attenuation losses
Description : When connector losses, splice losses and coupler losses are added, what is the limiting factor? ∙ A. source power ∙ B. fiber attenuation ∙ C. connector and splice loss ∙ D. detector sensitivity
Last Answer : D. detector sensitivity
Description : A fiber-optic cable has a loss of 15 dB/km. The attenuation in a cable 1000 ft. long is ∙ A. 4.57 dB ∙ B. 9.3 dB ∙ C. 24 dB ∙ D. 49.2 dB
Last Answer : A. 4.57 dB
Description : Fiber-optic cables with attenuation of 1.8, 3.4, 5.9 and 18 dB are linked together. The total loss is ∙ A. 7.5 dB ∙ B. 19.8 dB ∙ C. 29.1 dB ∙ D. 650 dB
Last Answer : C. 29.1 dB
Description : Why are visible-light LEDs not used for fiber optics? ∙ a. It has high losses ∙ b. It has short wave ∙ c. It has low attenuation ∙ d. It has weak signal
Last Answer : ∙ a. It has high losses
Description : The following are the cause of light attenuation in fiber optics except ∙ a. Backscattering ∙ b. Absorption ∙ c. Refraction ∙ d. Microbends
Last Answer : c. Refraction
Description : Which is not a possible cause of optical fiber loss? ∙ a. Impurities ∙ b. Glass attenuation ∙ c. Stepped index operation ∙ d. Microbending
Last Answer : ∙ c. Stepped index operation
Description : Under normal condition, a single fiber should not be used for a two-way communication mainly because of ∙ a. Loss ∙ b. Fading ∙ c. Noise ∙ d. Attenuation
Last Answer : ∙ c. Noise
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 : . A fiber-optic cable has a loss of 15 dB/km. The attenuation in a cable, 100 ft long is ∙ a. 4.57 dB ∙ b. 9.3 dB ∙ c. 24 dB ∙ d. 49.2 dB
Last Answer : ∙ a. 4.57 dB
Description : The loss in signal power as light travels down a fiber is called ∙ a. Dispersion ∙ b. Scattering ∙ c. Absorption ∙ d. Attenuation
Last Answer : ∙ d. Attenuation
Description : When connectorlosses,splice losses, and couplerlosses are added,whatisthe finallimitingfactor? a. Source power b. Fiber attenuation c. Connector and splice losses d. Detector sensitivity
Last Answer : d. Detector sensitivity
Description : What three factors must be considered in the transmission of a surface wave to reduce attenuation?
Last Answer : (a) electrical properties of the terrain (b) frequency (c) polarization of the antenna
Description : Is the attenuation of a coaxial cable independent of frequency?
Last Answer : No.
Description : Will an optical fiber's attenuation coefficient vary with changes in wavelength?
Last Answer : Yes.
Description : Define attenuation.
Last Answer : Attenuation is the loss of optical power as light travels along the fiber.
Description : Attenuation is mainly a result of what three properties?
Last Answer : Light absorption, scattering, and bending losses.
Description : OTDR stands for ∙ a. Optical Time Domain Reflectometer ∙ b. Optical Transmit Direction Return ∙ c. Optical Time Domain Time Regeneration ∙ d. Overtime Direct Reference
Last Answer : c. Optical Time Domain Time Regeneration
Description : OTDR stands for: a. Optical Time-Delay Response b. Optical Timing Delay Requirement c. Optical Time-Domain Reflectometer d. Optical Time-Division Relay
Last Answer : c. Optical Time-Domain Reflectometer
Description : Draw block diagram of OTDR and explain its working.
Last Answer : Block diagram of OTDR Working principle of OTDR: A light pulse is launched into the fiber in the forward direction from an injection laser using either a ... backscattered light is detected using avalanche photodiode receiver. Output of photodiode receiver drivers an integrator.
Description : When checking a diode with an ohmmeter, what is indicated by two high resistance measurements?
Last Answer : The diode is open or has a high-forward resistance.
Description : Radar surface-angular measurements are referenced to true north and measured in what plane?
Last Answer : Horizontal plane.
Description : What are the three units of measure most commonly used when referring to af power measurements?
Last Answer : DB, dBm, and vu.
Description : Kelvin bridges are well suited for what type of measurements?
Last Answer : Small values of resistances
Description : How does the supply voltage affect the accuracy of Wheatstone bridge measurements?
Last Answer : As the supply voltage increases, bridge components may heat up and become less accurate.
Description : When you are measuring a component using a bridge, what is the most common cause of inaccurate measurements?
Last Answer : The capacitive and inductive characteristics of the test leads.
Description : Power measurements performed with calorimeters are based on what three variables?
Last Answer : Temperature, mass, and time.
Description : For power measurements, what advantage does an electronic wattmeter have over an electrodynamic wattmeter?
Last Answer : Electronic wattmeters are capable of measuring high-fequency signals.
Description : Prior to substituting a diode, what measurements should you take to determine its condition?
Last Answer : Voltages and resistances.
Description : When making voltage measurements in a high-resistance circuit, you should always use a voltmeter with what relative value of resistance?
Last Answer : . High.
Description : What are the advantages of connecting ammeters in parallel when performing current measurements?
Last Answer : Decreased internal meter resistance, greater accuracy, and greater current range.
Description : Difference between conducting zone and respiratory zone. -Biology
Last Answer : answer:
Description : Two identical conducting wires `AOB and COD` are placed at right angles to each other. The wire `AOB` carries an electric current `I_(1) and COD` carr
Last Answer : Two identical conducting wires `AOB and COD` are placed at right angles to each other. The wire `AOB` carries an electric ... )^(2)+I_(2)^(2))^(1//2)`