EC2402 Optical Communication And Networking April2014 8th Semester Question paper - Reg2008

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Anna University
Question Paper Code : 51417
B.E./B.Tech. DEGREE. EXAMINATION, MAY/JUNE 2014.
Seventh Semester
Electronics and Communication Engineering
EC 2402/EC 72/10144 EC 702 - OPTICAL COMMUNICATION AND NETWORKING
(Regulation 2008/2010)
(Common to PTEC 2402 – Optical Communication and..Networking for B.E. (Part –Time) Sixth Semester–Electronics and.Communication Engineering  (Regulation 2009))



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PART A — (10 x 2 = 20 marks)

1. A multi mode fibre has core diameter of 50,,u m and cladding refractive index of 1.45. If its modal dispersion is 10 ns/km, find its numerical.aperture.
2. Distinguish meridional says from skew rays..
3. Identify the causes of scattering loss.
4. A fibre has an attenuation of 1.5 dB/Km at 1300 nm. If 0:5 mW of optical power is initially launched into the fibre, what is the power level in microwatts after 9Km? If the absorption coefficient of silicon is .0.05 micrometer' at 860.nin, find the penetration depth at which p(x)i Pn = 0.368 .
6. Define the internal quantum efficiency:of LED.
7. What are the receiver error sources?
8. Describe the-term 'Quantum limit.
9. List out the benefits of SONET over PDH networks.
10. Give the significance of solitons.

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