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WorksheetsOptical Fibre
Total questions: 20
Worksheet time: 10mins
The ratio of the refractive index difference of the
core and cladding to the refractive index of core of an optical fiber
Fractional Index Change
V-Number
Numerical Aperture
Acceptance Angle
Optical fibers are also called
(a)
The schematic represents
Graded index optical fibre
Step index optical fibre
Single mode optical fibre
Dual optical fibre
In an optical fiber, the concept of Numerical aperture is applicable in describing the ability of __________
Light Collection
Light Scattering
Light Dispersion
Light Polarization
The V number of a fiber is 4. then the fiber is
Single mode
Multimode
Optical fibre based on the principle of
total internal reflection.
total internal refraction.
diffraction.
interference.
The core of the optical fibre is
opaque and conducting material.
opaque and dielectric material.
transparent and conducting material.
transparent and dielectric material.
A measurement of the ability of an optical fibre to capture light is called
acceptance angle.
cladding.
numerical aperature.
critical angle.
The unit of Numerical aperature is
meter
degree
Coulomb per meter
no unit.
Which of the following statement is correct?
Refractive index of core and cladding are equal.
Refractive index of core is more then that of cladding.
Refractive index of core is less then that of cladding.
Refractive index of core is less or equal to that of cladding.
Which of the following is ( are) correct?
The refractive index of the core of the step index fiber is constant throughout the core.
The refractive index of the graded index fibre is maximum at the centre of the core and then it decreases towards core-cladding interface.
The bandwidth in fibre optical communication is very high as against in case of coaxial cable transmission.
All the above
Which part is not included in the fiber-optic communication system?
Transmitter
Transmission channel
Transformer
Receiver
The function of cladding is
to produce refraction of rays.
to produce total internal reflections of rays.
to produce transmission of Ray's.
to provide a firm support to the core glass.
Which of the following statements best explain the concept of material absorption?
A loss mechanism related to the material composition and fabrication of fiber.
A transmission loss for optical fibers.
Results in attenuation of transmitted light.
Causes of transfer of optical power.
The inner part of the optical fibre which carries light is called
Cladding
Core
Sheath
Cover
In single mode fibre V parameter is
2.405
>2.405
< 2.405
Light is guided through optical fibre when
angle of incidence at core cladding boundary < critical angle
angle of incidence at core cladding boundary > critical angle
14. Maximum number of modes =( V^2)/2 is applicable for
multi-mode step index fibres
single mode step-index fibres
single mode graded index fibre
multi-mode graded index fibres
Layer of fibre that protects it from abrasions, contamination and harmful influence of moisture is
Core
Cladding
Sheath
Conditions for light propagation are
Refractive index of core < refractive index of cladding & Core- cladding interface angle of incidence < critical angle
Refractive index of core < refractive index of cladding & Core- cladding interface angle of incidence >critical angle
Refractive index of core > refractive index of cladding & Core- cladding interface angle of incidence < critical angle
Refractive index of core > refractive index of cladding & Core- cladding interface angle of incidence > critical angle
