Bissoy.com
Doctors Medicines MCQs Q&A

Which type of optical fiber is used to eliminate modal dispersion during optical communication?

Which type of optical fiber is used to eliminate modal dispersion during optical communication? Correct Answer Single mode step index fiber

Single-mode step-index fiber is used to eliminate modal dispersion during optical communication.

Advantages of single-mode fiber:

1) Low signal loss

2) No modal dispersion

3) Does not suffer from modal dispersion

4) Can be used for higher bandwidth applications

5) Long-distance applications

6) Cable TV ends

7) High speed local and wide area network

1) Single-mode fiber core diameter is much smaller than multimode fiber.

 

The multimode step-index multimode fiber suffers from Modal dispersion.

 

 

  • Rays of light enter the fiber with different angles to the fiber axis. The limit is the fiber’s acceptance angle.
  • Rays that enter with a shallow angle travel a more direct path and arrive sooner than those that enter at steeper angles.
  • This arrival of different modes of light at different times is called modal dispersion.

 

 

Single-mode

Multimode

Light Source

Laser or laser diodes

Vertical cavity surface-emitting lasers

Wavelength

1310 nm & 1550 nm

850 nm & 1300 nm

Bandwidth

Unlimited because it allows only one light mode to pass through at a time

Limited by its light mode

 

Related Questions

Consider the following statements: 1. Fiber optics is based on the principle of total internal reflection. 2. In an optical fiber communication system, power consumption is extremely low. 3. In India, Reliance Group of Industries is engaged in the manufacture of optical fiber. 4. Optical fiber communications are free from radio frequency interference. Which of the following statements is/are correct?
Some of the physical and functional advantages of optical fiber communication are mentioned here. Select the option which tells about the functional advantages of optical fiber communication. I. The transmission bandwidth of the fiber optic cables is higher than the metal cables. II. Since these cables are di-electric, no spark hazards are present. III. Fibre optic cables last longer than copper cables. IV. The amount of data transmission is higher in fiber optic cables. V. Fibre optic cables are immune to electromagnetic interference. VI. These are not affected by electrical noise.
The modal dispersion in a fiber is 20 ns/km. what will be the overall pulse spread in 10 km long fiber? Assume material dispersion to be zero
Consider the statements given below and select the correct statement(s)
1. Computer-mediated communication (CMC) is defined as any human communication that occurs through the use of two or more electronic devices.
2. Computer-mediated Communication can be broken down into two forms i.e. synchronous and asynchronous.
3. Synchronous computer mediated communication refers to communication which occurs in real time.
4. Asynchronous computer mediated communication refers to communication which takes place when the parties engaged are not communicating in unison.
Which of the following set of statements are correct for describing the human communication process?
1. Non-verbal communication can stimulate ideas.
2. Communication is a learnt ability.
3. Communication is not a universal panacea.
4. Communication cannot break down.
5. More communication means more effective learning by students.
6. Value of what is learnt through classroom communication is not an issue for students.
Select the correct answer
In pulse dispersion measurements, the 3dB pulse broadening for the fiber is 10.5 ns/km and the length of the fiber is 1.2 km. Calculate the optical bandwidth for the fiber.
If the first two statements are true, the third statement is :
I. Oat cereal has more fiber than corn cereal but less fiber than bran cereal.
II. Corn cereal has more fiber than rice cereal but less fiber than wheat cereal.
III. Of the three kinds of cereal, rice cereal has the least amount of fiber.
A single mode fiber has a zero dispersion wavelength of 1.21μm and a dispersion slope of 0.08 psnm-2km-1. What is the total first order dispersion at wavelength 1.26μm.
A single mode fiber has a zero dispersion wavelength of 1.21μm and a dispersion slope of 0.08 psnm-2km-1. What is the total first order dispersion at wavelength 1.26μm.
Match List I with List II List I (Examples of Communication) List II (Type of Communication) a)  A company boss telephones his / her secretary for some help from outside. i)  Marketing communication b)  A company issues a circular of guidelines for its employees. ii)  Horizontal communication c)  Employees discuss certain issues among themselves. iii)  Vertical communication d)  A company sends a formal letter to its retailers and wholesalers. iv)  Informal communication   Choose the correct answer from the options given below: