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2003 Course Advanced Communication Systems

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Total No. of Questions : 12] [Total No. of Pages : 5 [3764] - 233 B.E. (E & TC) ADVANCED COMMUNICATION SYSTEMS (404225) (2003 Course) P1477 Time : 3 Hours] [Max. Marks : 100 Instructions: 1) Answers to the two sections should be written in separate answer books. 2) 3) 4) 5) Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Assume suitable data, if necessary. All quetions are compulsary SECTION - I Q1) a) b) c) Q2) a) b) c) d) Q3) a) b) With the help of appropriate diagram describe the operational principle of WDM. [8] Briefly explain the working of Optoisolator. [4] Determine spectral bandwidth of optical fiber system, if usable spectral band = 105nM and operating center wavelength is 1550nM. [4] OR With the help of schematic diagram explain the working of 2*2 coupler, employing all glass optical fibre. Explain the purpose of tapered region in this coupler. [4] State the mathematical relation between input power, throughput power, coupled power and return loss for 2*2 coupler. State the relation of input with other outputs, considering coupling coefficients and axial distance. [4] With the help of neat diagram briefly explain Tap coupler. [2] Consider a commercially available 8*8 star coupler, made from 2*2 coupler, elements of 3 db attenuation. About 6% power is lost in each element. Find the excess loss, splitting ratio and total loss. [6] Explain how tunable light sources are useful in wavelength multiplexing. [6] Change of refractive index for a DFB laser is 0.75%. Determine the tuning rage (tune). If 60 channels are operating in this range, determine spectral width (SIGNAL) at 2.54Gbps. [6] P.T.O.

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