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How to connect SFP optic transceiver?

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yangvic

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I connect a LVDS SERDES to a SFP optic transceiver.SERDES is LVDS interface.I use DC direct coupling.BUT it hacv some CRC.If add 83ohm&130ohm DC Bias,CRC will decrease,BUT still hace CRC.IF use AC coupling,CRC do not disappear,too.MY SERDES is Marvell 88E1011S(output Vod=400mV,Vos=1.2V ).SFP optic transceiver is aglient HFBR5710L.Somebody can help me?
 

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