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2003 Course Advanced Communication Systems

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Total No. of Questions : 12] [Total No. of Pages :5 [3864] - 273 B.E. (E & TC) ADVANCED COMMUNICATION SYSTEMS (404225) (2003 Course) P1154 Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to the two sections should be written in separate books. 2) 3) 4) 5) Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Assume suitable data, if necessary. Use of logarithmic tables, slide rule, electronic pocket calculator is allowed. SECTION - I Q1) a) b) c) With the help of appropriate schematic diagram describe operational principle of WDM. [8] Explain in brief WDM standards. [4] Find spectral bandwidth of optical fiber system when usable spectral [4] band, =100 nm and centre wavelength is 1420 nm. OR Q2) a) With help of block schematic explain basic star coupler for splitting or combining optical powers. [6] b) With help of appropriate mathematical expressions, explain in brief following terms. i) ii) iii) iv) Splitting ratio. Excess loss. Insertion loss. Return. [6] P.T.O.

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