Free Printable Optical Communication

Worksheets

Optical Communication

Total questions: 45

Worksheet time: 45mins

Name

Class

Date

If a light travels in a certain medium and it gets reflected off an optically denser medium with high refractive index, then it is regarded as _______

External Reflection

Internal Reflection

Refraction

Both a and b

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 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

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

The schematic represents

Graded index optical fibre

Step index optical fibre

Single mode optical fibre

Dual optical fibre

The core of the optical fibre is

opaque and conducting material.

opaque and dielectric material.

transparent and conducting material.

transparent and dielectric material.

The minimum angle of incidence ( $\theta$ 1) at which the ray strikes the interface of the two medium and causes an angle of refraction ( $\theta$ 2) equal to 90 $\degree$ is known as

Refractive Index

Numerical Aperture

Acceptance Angle

Critical Angle

Determine the NA of fiber with the acceptance angle 17.36 $\degree$

0.298

1.45

0.22

10.

What are the types of fiber

Multi Mode Graded Index Fiber

Multi Mode Step Index Fiber

Single State Index Fiber

Single Mode Fiber

11.

Refractive index of core is

Higher

Lower

12.

Refractive index of cladding is

Higher

Lower

13.

Range of optical communication

700 nm to 1700 nm

800 nm to 1600 nm

800 nm to 1200 nm

800mm to 1600 mm

14.

Which is the fundamental mode of propagation in fibers?

LP01

LP11

LP21

LP22

15.

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

16.

The condition for propagation of light in optical fibers is

$Sin\theta_i<NA$

$Sin\theta_i>NA$

$Sin\theta_i=NA$

$Sin\theta_i=0.5$

17.

How many mechanisms are there which causes absorption?

18.

Absorption losses due to atomic defects mainly include-

Radiation

Missing molecules, oxygen defects in glass

Impurities in fiber material

Interaction with other components of core

19.

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

20.

3dB optical bandwidth is always ___________ the 3dB electrical bandwidth.

Smaller than

Larger than

Negligible than

Equal to

21.

What are fibre optics?

thin, flexible fibres of glass/plastic

flexible fibers of copper

strands of rubber

those glow toys

22.

Fiber optics provide data security.

True

False

23.

If a light travels in a certain medium and it gets reflected off an optically denser medium with high refractive index, then it is regarded as _______

External Reflection

Internal Reflection

Refraction

Both a and b

24.

Refractive index of cladding varies in graded index fibers?

True

False

25.

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

26.

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

27.

Optical fibers for communication use are mostly fabricated from

Plastic

Silica or multicomponent glass

Ceramics

Copper

28.

It is not important to cover the optical fibers required for transmission. State whether the given statement is true or false.

YES

29.

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

30.

____________ results from small lateral forces exerted on the fiber during the cabling process.

Attenuation

Micro-bending

Dispersion

Stimulated Emission

31.

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

32.

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.

33.

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.

34.

_____________ are capable of launching powers between 0.5 and several mW

LED’s

Injection laser

Attenuator

Reflector

35.

For linear as well as in nonlinear mode _______________ are most important network elements.

Optical amplifier

Optical detector

A/D converter

D/A converters

36.

What is the full form of LASER

Light Amplification by Stimulated Emission of Radiation

Long And Strong Emission Range

Light Amplification by Sustained Emission and Radiation.

Lower Range Amplification of Signal

37.

Select the correct option

Optical fiber has very high tensile strength.

Fiber optics communication has very small repeater spacing

The losses in fiber optics communication is very high

There are frequent problems of short circuit n earth loop in fiber optics.

38.

Select the disadvantages of fiber optics communication.(select multiple answers)

Fiber components are still in the developing stage.

Fiber splicing is a sophisticated technique and requires skilled technicians.

Fiber optics systems are costlier than satelite communications.

One can easily tap fiber signals and get the data.

39.

What are the three optical windows in fiber optics communication?

750nm, 1350nm, 1600 nm

850nm, 1300nm, 1550nm

800, 1100, 1600

850nm, 1300nm, 1450nm

850mm, 1300mm, 1550nn

40.

________________ cannot be used for wideband amplification

Semiconductor optical amplifier

Erbium-doped fiber amplifier

Raman fiber amplifier

Brillouin fiber amplifier

41.

The ____________ affects the light gathering capacity and the normalized frequency of the fiber.

Numerical aperture

Amplitude modulation

Responsivity

Quantum efficiency

42.

Far field pattern measurements with regard to multimode fibers are dependent on the _____________ of the fiber

Amplitude

Frequency

Diameter

Length

43.

Which of the following is a non-contacting optical method of on-line diameter measurement?

Brussels’s method

Velocity differentiator method

Photo detector method

Image projection method

44.

Luminescence is because of

Photons emitted while excited electrons drop down

Knocking out of electrons by photons

Photons stimulated by photons

All

45.

A ray of light will undergo total internal reflection if it

Goes from rarer medium to denser medium

Incident at an angle less than the critical angle

Strikes the interface normally

Incident at an angle greater than the critical angle

Reset

Optical Communication

Total questions: 45

Worksheet time: 45mins

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