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(a) Describe the function of the core and cladding in optical fiber. Why their refractive are indexes different.

(b) What does the transparent windows means? Specify three peak wavelengths for the transparent window in modern optical fibers.

(c) What are the primary features of designing of an optical source?

(d) Explain the Optical Access Network.

(e) How lincar scattering does contributes to increase in BER? 

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(a) Define the terms:

   i. Acceptance Angle

  ii. Numerical Aperture

  iii. Snell's law 

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(b) Discuss the various advantages of Optical Fiber. Compare Step and Graded index fibers.

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(a) Draw a block diagram of an optical communication system showing its various components. Explain in brief the function of each component. 

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(a) List the three major causes of attenuation in an optical fiber and explain their mechanism. How these can be minimized.

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(b) Determine the number of modes for a multimode fiber if core radius (a=20 ), wavelength   , n1=1.475 and n2=1.472. How many modes will propagate if is changed to 1.3

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(a) Differenitate between intermodal and intramodal dispersion. Explain the concept of dispersion shifted fiber.

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(a) The light output from the GaAs is coupled into a step index fiber with a numerical aperture of 0.2, a core refractive index of 1.4 and a diameter larger than the diameter of the device. Determine the coupling efficiency into the fiber and the optical loss relative to the power emitted from the LED.

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(b) What is population inversion? What is mcant by optical and electrical confinement in LASER? How is it achieved? Explain. 

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(a) Explain the various techniques used to couple light from an LED in an optical fiber. Discuss the LED emission pattern for surface emitting LED and edge emitting LED. 

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(b) Derive an expression for optical power generated internally to the LED.

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(a) Why does an optical transmission section (Amplifier) layer exist at each WDM node and not just at the amplifier node?

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(b) What do you understand by the multiplexing and de-multiplexing of light?What is sub-carrier multiplexing?

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(a) Discuss the transport networks in optical communication.

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(b) Write detail note on Synchronous optical fiber networks (SUNET).

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