EC6702 OCN Important Questions
Anna University Regulation 2013 ECE EC6702 OCN Important Questions with Answer Key for all 5 units are provided below. Download link for ECE 7th SEM EC6702 Optical Communication Networks Engineering Answer Key is listed down for students to make perfect utilization and score maximum marks with our study materials.
EC 6702- OPTICAL COMMUNICATION AND NETWORKING
UNIT I – Introduction
1. What are the limitations of optical fiber communication systems?
x Optical fiber is made up of glass. Because of the impurities present with the fiber
It results in absorption, which leads to loss of light in the optical fiber.
x It is costly.
x Maximum limitation of the bandwidth of the signals can be carried by the fiber due to spreading of pulse.
2. What is the necessity of cladding for an optical fiber?
The necessity of cladding for an optical fiber is
x To avoid leakage of light from the fiber
x To avoid mechanical strength for the fiber
x To protect core from scratches and other mechanical damages.
3. List the advantages of mono-mode fiber.
The advantages of mono-mode fiber are
x No internal dispersion
x Information capacity of single mode fiber is large.
4. Define – Acceptance Angle
The maximum angle Фmax with which a ray of light can enter rough the entrance end of the fibre and still be totally internally reflected is called acceptance angle of the fiber.
5. List the uses of optical fiber.
The uses of optical fibers are as follows
x To act as light source at the inaccessible places
x To transmit the optical images. (example: endoscopy) To act as sensors to do mechanical, electrical and magnetic measurements
x To transmit the information which are in the form of coded signals of the telephone communications, computer data etc.
6. List the disadvantages of mono-mode fiber.
The disadvantages of mono-mode fiber are
x Launching of light into single mode and joining of two fibers are very difficult.
x Fabrication is very difficult and so that fiber is so costly.
7. What is the principle used in the working of fibers as light guides?
The phenomenon of total internal reflection is used to guide the light in the optical fiber. To get total reflection, the ray should travel from denser region rarer region i.e. from core to clad region. Of the fiber and the angle of incidence in the denser medium should be greater than the critical angle of that medium.
8. Define- Refraction
When light travels from air medium to glass medium, bending of light may occur. This is called refraction.
EC6702 OCN All units Important Questions – Download Here
EC6702 OCN All units Important Questions – Download Here
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