EI8075/FIBRE OPTICS AND LASER INSTRUMENTS/UNIT 1& 2 Important questions

 

 UNIT I OPTICAL FIBRES AND THEIR PROPERTIES              &  

UNIT II INDUSTRIAL APPLICATION OF OPTICAL FIBRES   

Important questions

PART A

• Draw the block diagram of the Optical Fiber Communication system

• Define Total Internal Reflection

• Problem

• Define acceptance angle

• List out the requirements for optical detector

• List out the types of optical fiber sensors with an example

• What are Moire fringes

• Write a short note on optical modulators and their type.

• What are Dispersion and mention its type?

• Write a short note on Non-linear scattering loss

• What is incident and reflected light?

• Define critical angle?

Among microwaves & light waves, which have a high bit rate distant product? Why?

What is the necessity of cladding for an optical fiber?

Mention three advantages of optical fiber as a waveguide over conventional metallic waveguide?

What is a Fiber Optic Polarimeter?

Define a modulator? Give its types?

What are the important parameters of optical detectors?

Explain briefly about pockels effect?

Discuss briefly micro-bending and macro-bending in fiber optics?

PART B

Step index & graded-index fiber Meridional and Skew rays Principle of light propagation and guiding mechanism in fiber optics.

Measurement of attenuation (by cut-back method) Fiber Absorption Measurement  Different types of modulators  Measurement of scattering loss and near field scanning techniques Measurement of dispersion Problem Transmission and mechanical characteristics of optical fiber Measurement of pressure and temperature using fiber optics Optical source (LED) and Optical detector (P-I-N)