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WorksheetsOptical Communication - Introduction to Optical Fibers - 2
Total questions: 30
Worksheet time: 16mins
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
After Total Internal Reflection the Meridional ray
Makes an angle equal to acceptance angle with the axial ray
Makes an angle equal to critical angle with the axial ray
Travels parallel equal to critical angle with the axial ray
Makes an angle equal to critical angle with the axial ray
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
It is not important to cover the optical fibers required for transmission. State whether the given statement is true or false.
YES
No
The V number of a fiber is 4. then the fiber is
Single mode
Multimode
A silica optical fiber with a large core diameter has a core refractive index of 1.5 and a Cladding refractive index of 1.47. Determine the acceptance angle in air for the fiber.
(a)
A silica optical fiber with core diameter large enough to be considered by Ray theory has a core refractive index of 1.5 and cladding refractive index of 1.47.Determine numerical aperture.
(a)
calculate the cut off wavelength of a single mode fibre with core radius of 4 m and index difference= 0.003
(a)
The wavelength region used in second window
800 to 900 nm
1100 to 1350nm
1500 to 1650nm
1200 nm to 1400 nm
The significance of fourth generation optical communication system is
Optical amplifier
Optical source
Optical coupler
splicers
For total internal reflection, the Angle of incidence is ---------than critical angle.
(a)
Based in number of modes transmission, optical fiber can be classified into ------.
(a)
n1 and n2 are the ---------- of core and cladding.
(a)
Single mode fiber will have --------- attenuation.
(a)
Single mode fiber will have ------- bandwidth
(a)
What is the first window for optical communication?
860nm
850nm
890nm
870nm
Refractive index of cladding varies in graded index fibers?
True
False
Numerical aperture of a fiber is given by :
(n1^2 - n2^2)^1/2
(n2^2 - n1^2)1/2
(n1^2 - n2^2)
(n1^2 - n2^2)^3/2
For efficient propagation of light through a fiber angle of incident of light rays at the fiber input should be :
Less than critical angle
Less than acceptance angle
Less than Brewster's angle
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
Which of these types of optical fibers is almost impossible to manufacture?
Single mode, step index OFC
MUlti mode, Step index OFC
Single mode, graded index OFC
Multi mode, graded index OFC
The condition for propagation of light in optical fibers is
Sinθi<NA
Sinθi>NA
Sinθi=NA
Sinθi=0.5
Inter-modal dispersion can be minimized by
Single Mode OFC
Graded Index multimode OFC
Step Index multimode OFC
Multimode step index fiber has
a) Large core diameter & large numerical aperture
b) Large core diameter and small numerical aperture
c) Small core diameter and large numerical aperture
d) Small core diameter & small numerical aperture
The core of the optical fibre is
opaque and conducting material.
opaque and dielectric material.
transparent and conducting material.
transparent and dielectric material.
Classifications of fiber-optic cable based on the design of the cable core are _____ and _____.
graded-index, step-index
step-index, single-mode
single-mode, graded-index
multimode, single-mode
Th e broad classifications of fiber-optic cable based on the diameter of the core are _____ and _____.
graded-index, step-index
step-index, multimode
multimode, single-mode
graded-index, multimode
What are the main parts of fiber optics?
cladding, core and a buffer coating
a laser, shutter, beam splitter, lenses mirrors and film.
Lens, film, body
a flash tube, two mirrors and atoms
Which description best explains how fiber optics work?
The light in this instrument travels by travelling down a “hallway” and bouncing off through total internal reflection
light is passed through a prism where it is then put on a screen
This instrument works by exciting atoms and causing them to release photons. After the photons have been released, they bounce back and forth until they are emitted out of the device.
This instrument uses a laser that shines light into a lens. The lens then hits a splitter where it is split from one beam to two. The two beams of light then hit mirrors that direct them to their correct locations.
