WorksheetsOPTICAL FIBER - FULL
Total questions: 20
Worksheet time: 10mins
Optical fibre based on the principle of
total internal reflection.
total internal refraction.
diffraction.
interference.
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.
The inner part of the optical fibre which carries light is called
Cladding
Core
Sheath
Cover
In an optical fiber, the concept of Numerical aperture is applicable in describing the ability of __________
Light Collection
Light Scattering
Light Dispersion
Light Polarization
Optical fibers for communication use are mostly fabricated from
Plastic
Silica or multicomponent glass
Ceramics
Copper
What is dispersion in optical fiber communication?
Compression of light pulses
Broadening of transmitted light pulses along the channel
Overlapping of light pulses on compression
Absorption of light pulses
Chromatic dispersion is also called as intermodal dispersion. State whether the given statement true or false.
True
False
Intermodal dispersion occurring in a large amount in multimode step index fiber results in
Propagation of the fiber
Propagating through the fiber
Pulse broadening at output
Attenuation of waves
What are fibre optics?
thin, flexible fibres of glass/plastic
flexible fibers of copper
strands of rubber
glow toys
Define - Acceptance Angle
maximum angle that a light ray can have relative to the axis of the fiber and propagate down the fiber.
minimum angle that a light ray can have relative to the axis of the fiber and propagate down the fiber.
Right angle that a light ray can have relative to the axis of the fiber and propagate down the fiber.
None of the above
Define − Numerical aperture
is defined as the Cos of the acceptance angle
is defined as the sine of the acceptance angle
is defined as the reverse of the acceptance angle
is defined as the inverse of the acceptance angle
How many mechanisms are there which causes absorption?
1
3
2
4
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
What are the types of optical fiber?
Material
Number of modes
Refractive index profile
All the above
Physical parameters are sensed directly is
Active sensor
Intrinsic sensor
Passive sensor
Both 1 and 2
Example for passive sensor
Displacement sensor
Temperature sensor
Pressure sensor
None
A light wave acting as a carrier wave is capable of carrying
less information
more information
medium information
No information
Step index multi mode fiber has
core diameter has 50 to 200 µm
core diameter has 100 to 200 µm
core diameter has 50 to 100 µm
core diameter has 50 to 150 µm
The fiber optic transmitter has which of the following functions?
Amplifies the optical signal
Converts the electrical input signal to an optical signal
Converts the input optical signal to an electrical signal
Amplifies the output electrical signal
