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# TUT3 - OPTICAL FIBER COMMUNICATION SYSTEM PROF A.M.ALLAM...

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° OPTICAL FIBER COMMUNICATION SYSTEM PROF. A.M.ALLAM TUT3 FIBER COUPLERS&OPTICAL NETWORKS

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± OPTICAL FIBER COMMUNICATION SYSTEM PROF. A.M.ALLAM 2-Consider an ideal tapered single-mode directional coupler having 1:1 splitting ratio. The coupling coefficient is °± = 1rad/mm. (a) What is the length of the coupling region? (b) Repeat for a 10:1splitting ratio. 1-A four port directional coupler has 4:1 splitting ratio and an excess loss equal to 2 dB. The coupler’s directionality is 40 dB. (a) What fraction of the input power goes to each of the ports? (b) Compute the throughput loss and tap loss.
² OPTICAL FIBER COMMUNICATION SYSTEM PROF. A.M.ALLAM 3- A five terminal tee network is structured like the one shown in Fig. a. The tee couplers are like the one shown in Fig. b. Assume ideal 3-dB couplers, ideal fibers, and lossless connectors. (a) Draw the entire network (b) Compute the transmission loss to each of the receivers when the terminal 1 is the transmitter.

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