As per syllabus of Dr,BATU,Lonere B.Tech Final Year Electronics and Telecommunication Engineering

1. Fiber
Optic Communication (3
Grades)
AS PER THE SYLLABUS OF DR.BABASAHEB TECHNOLOGICAL
UNIVERSITY LONERE B.TECH(FINAL YEAR- ELECTRONICS AND
TELECOMMUNICATION ENGINEERING)

2. Fiber Optic Communication
Unit No. Unit Name
01 Introduction
02 Types of Optical Fiber
(Different types of optical fibers, Modal analysis of a step
index fiber, Signal degradation on optical fiber due to
dispersion and attenuation. Fabrication of fibers
and measurement techniques like OTDR.)
03 Optical Sources
04 Optical Switches
05 Optical Amplifiers
06 Nonlinear Effects in fiber Optics Link

6. • Complete Input/ Output Electric Isolation
• Broadband bandwidth over longer distance
• No EMI ( Electromagnetic Interference)
• Light-weight and small diameter cable
• High Security
• High Flexibility
Advantages of Optics Fiber as a media

7. • Difficult to Splice
• Expensive to install
• Can't Curved
Disadvantages of Optics Fiber as a
media

8. Refractive index is ratio of velocity of light in vacuum to the velocity of light in a
medium.

12. In optics, the numerical aperture (NA) of an optical system is a dimensionless number that characterizes the range
of angles over which the system can accept or emit light.

18. Measurement of Numerical aperture and attenuation constant of optical fiber
The maximum angle within which light will be accepted into and guided through optical fiber is
NA = n0 Sin (αmax)
= (n12 – n22)½
= Sin (tan-1(D/2L))
where
αmax = the half acceptance angle,
n0 = the refractive index of air
n1 = the refractive index of the core
n2 = the refractive index of the cladding
D = the diameter of the spot on the screen
L = the distance between the output end of the fiber and the screen.
If the incident angle α < αmax, the ray undergoes multiple internal reflections at core and cladding interface, and
it is called the guided ray. If α < αmax, the ray undergoes only partial reflection at core cladding interface. In short
length of straight fiber, ideally a ray launched at angle α at the input end should come out at the same angle α
from output end. Therefore, the far field at the output end will also appear as a cone of semi angle αmax
emanating from the fiber end.

19. Ray Model

20. Wave Model

21. Test-10 Marks-20 Minutes
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