Optical Communication — Winter 2021

Using simple ray theory, describe the mechanism for the transmission of light within an optical fiber and show how acceptance angle is related to the fiber numerical aperture

Describe briefly the degradation of signal in optical fiber. 0

Explain block diagram of optical communication system with neat sketch and mention functions of each block.

Mention the advantages and applications of optical fiber communications.

Amultimode step index fiber with a core diameter of 80 µm and a relative index difference of 1.5% is operating at a wavelength of 0.85 µm. If the core refractive index is 1.48,calculate:

Normalized frequency of fiber (ii) Total number of guided modes.

List the different types of lensing schemes used in optical system and explain.

Discuss optical power loss model for a point to point link.

Discuss the various dispersion mechanisms that contribute to pulse broadening during the fiber transmission.

Explain (1) fusion splicing, (2) V-grove splicing and (3) elastic tube techniques for fiber splicing

(a) List the types of Light Emitting Diodes used in optical system and explain any one of them with required figure.

Briefly explain the principal of optical detection. Discuss the major advantages of APD over P-i-n photodiode.

Technically explain the term spontaneous emission and stimulated emission.

Define the following terms related to photo detector. (1) Responsivity (2) Quantum efficiency (3) Cut off wavelength

What is meant by attenuation of signal in fiber cable? How this loss can be measured?

Explain the basic principles of WDM and DWDM with respect to optical fiber system.

Discuss the need of optical Amplifier and also describe the architecture and amplification mechanism of Erbium Doped Fiber Amplifier. (EDFA).

Write short notes on Synchronous optical fiber networks (SONET)