UpWork (oDesk) & Elance Fiber Optics Test Question & Answers
UpWork (oDesk) & Elance Fiber Optics Test Question & Answers are really very important to pass UpWork & Elance test. You will get top score at this skill test exam. If you found any problem or wrong answer please inform me via contact or comments. We will try to solve it in short. This test is extremely valuable to acquire knowledge of Fiber Optics. Lets Start test.
Ques : For a step index fiber, relationship between numerical aperture (NA) and coupling efficiency (?c) is ________.
Ans : b
Ques : Mirrors are placed in LASER optical sources to maintain conditions for ________.
Ans : amplification
Ques : Optical bandwidth (OB) relates to electrical bandwidth (EB) when
Ans : OB>EB
Ques : What is the thermal noise current it in a resistor R expressed in its mean square value?
where, K is Boltzmann's constant, T is absolute temperature and B is the bandwidth
Ans : c
Ques : For a profile parameter (a)=1, the profile shape of refractive index for a graded index fiber will be _______.
Ans : parabolic
Ques : The rays which travel in a helical path through an optical fiber are called ______.
Ans : skew rays
Ques : Dark spot defects (DSD's) occur in:
Ans : Fiber LASER
Ques : What happens when dispersion occurs?
Ans : Output transmitted pulse gets completely eliminated
Ques : Silicon reach through avalanche photodiodes has _______.
Ans : maximum absorption of electrons
Ques : The vapor-phase deposition technique is used to produce _______.
Ans : fiber-rich glasses
Ques : Scattering losses happen due to
Ans : imperfections in glass manufacturing process
Ques : Graded-index fibers have:
Ans : None of these
Ques : Dispersion in optical fibers causes distortion in _______.
Ans : digital signals only
Ques : The LASER is a/an
Ans : incandescent device
Ques : SONET is _________.
Ans : Silicon optical network
Ques : In p-i-n photodiodes "i" stands for:
Ans : Intrinsic
Ques : Dispersion is the lowest in a________.
Ans : Multimode graded-index fiber
Ques : Superluminescent LED's are preferred because of _______.
Ans : low output power
Ques : Total internal reflection takes place at angles ________.
Ans : greater than the critical angle
Ques : LED is more suitable for analog transmission because of its _______.
Ans : modulation property
Ques : When optical power is incident on the photo detector during the 0 bit period, then the system is said to exhibit _______.
Ans : a zero extinction ratio
Ques : Which of the following is a fiber dispersion measurement method?
Ans : Time domain measurement
Ques : Germanium photodiodes are generally not preferred in the optical fiber system because of _________.
Ans : large dark current
Ques : Which one of the following is a type of non-linear scattering?
Ans : Ultraviolet scattering
Ques : Refer to the figure above.
The critical angle at the core cladding interface is given by:
Ans : c
Ques : Intersymbol interference (ISI) in optical fibers occurs due to ______.
Ans : scattering
Ques : Near-field scanning method is used to measure:
Ans : Fiber attenuation
Ques : Which phenomenon does not let light rays escape an optical fiber?
Ans : Total internal diffraction
Ques : Quantum efficiency (?) is defined as
Ans : c
Ques : Which of the following is an Optical System Design Software?
Ans : Photonic Transmission Design Suite (PTDS)
Ques : COBRA (commutateur optique binaire rapide) is an ________.
Ans : optical detector
Ques : For a multimode optical graded index fiber, the profile parameter (a) will be equal to:
Ans : 8
Ques : What would the optical return loss (ORL) be defined as when r-fresnal reflection occurs at a fiber-air interface?
Ans : ORL= -20log10r
Ques : When microwave frequency rather than radio frequency subcarriers are employed, the strategy is usually referred to as ______.
Ans : Code-division multiplexing
Ques : FDDI can support a data rate of
Ans : 100 Mbps
Ques : Numerical aperture (NA) is related to the refractive indexes of core (n1) and cladding (n2) when,
Ans : b
Ques : What does TPON stand for?
Ans : Telephony on a polarized optical network
Ques :Light emitting diodes (LED's) are:
Ans : None of the above
Ques : A multimode graded index fiber exhibits total pulse broadening of 0.2 µsec over a distance of 10Km. Estimate the maximum possible bandwidth assuming that there is no inter-symbol interference.
Ans : 1 MHZ
Ques : Homodyne detection is used for _______.
Ans : incoherent systems
Ques : Avalanche photodiodes are ________.
Ans : more sensitive than simple photodiodes
Ques : Hydrogen absorption by optical fiber causes _______.
Ans : an increase in optical fiber losses
Ques : For an ideal photo detector, the absorption coefficient must be ______.
Ans : large
Ques : Rayleigh scattering is a ________.
Ans : non-linear scattering
Ques : FDDI is _______.
Ans : Fiber distributed data interface
Ques : Macro bending losses in optical fibers can be reduced by designing the fibers with ________.
Ans : a fiber glass
Ques : Metallic impurities are eliminated from optical fiber by:
Ans : Vapor axial deposition (VAD) method
Ques : The information carrying capacity of optical fibers is in the range of:
Ans : MHZ
Ques : The first generation optical fibers are fabricated from:
Ans : Gallium aluminum arsenide alloys
Ques : The Nd:YAG LASER is a/an_______.
Ans : injection laser
Ques : Optical time domain reflectometry (OTDR) is a/an ________.
Ans : attenuation measurement technique
Ques : What is the relationship between refractive index (n1) of core and refractive index (n2) of cladding for an optical fiber?
Ans : n1 < n2
Ques : SOLITON is a/an ______.
Ans : type of optical fiber
Ques : What is signal attenuation in an optical fiber where P1=Input power and P0=Output power
Ans : c
Ques : Index optical fibers are sometimes referred to as:
Ans : Homogenous core fibers
Ques : IEEE 802.5 is a/an ________.
Ans : Token ring
Ques : The cutback technique is a/an _______.
Ans : refractive index measurement technique
Ques : he refractive index is defined as the ratio of ____________.
Ans : the velocity of light in the medium to the velocity of sound in a vacuum
Ques : The population inversion phenomenon in optical sources occurs when _________.
Ans : None of the above
Ques : Intermodal dispersion is less in a __________.
Ans : Multimode step index fiber
Ques : The fiber gyroscope is an ______.
Ans : Intrinsic fiber sensor
Ques : One polarization maintaining fiber operates at a wavelength of 1.5 µm and has a beat length of 0.6mm. Its modal birefringence is given by _______.
Ans : 1.5 x 10-3
Ques : The output power of a LASER is greater than that of a LED because of _____.
Ans : spontaneous emission
Ques : Dispersion is low in the __________.
Ans : Multimode step index fiber
Ques : Surface emitter LEDs have high radiance because _______.
Ans : of n-type diffusion into the p-type substrate
Ques : LASER stands for:
Ans : Light amplification by straight emission of radiation
Ques : Dark line defects (DLDs) occur when:
Ans : mobile impurities are displaced into the active region of LASER
Ques : Which of the following is a characteristic of an injection LASER?
Ans : Amplification
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