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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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