光纤通信课件chapter8～9 Homework

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1、1.Acouplerhasoneinputportand16outputports,alloutputportsareequal.Iftheinputsignalpoweris-10dBm，computerthepowerofoneoutputport.2.Whenlightistransmittingfromafiberofcoreradiustoonehavingcoreradiusb,supposeandthebothfibersarestep-indexandmultimode.Computertheloss.

2、3.Sketchathree-wavelengthfiber-gratingdemultiplexer,showinghowthetotalthreewavelengths,,canbedetectedindividually.(Hint,Fig.9.48inthetextbook)9.274.Afour-portdirectionalcoupler(DC)showsbelow,assume,writetheexpressionsofThroughputLoss,TapLoss,Directionality,Exces

3、sLossandSplittingRatio.5.ABragggratingisresonantat1550nm.Thegratingwillbetunedthermally.Theincreaseingratingperiodfromanincreaseintemperatureis0.1%per℃.1)Calculatethegratingperiod.2)Whatisthechangeinresonantwavelengthper℃?Givetheanswerinnm/℃.9.35(1,2)