英语论文句型.doc摘要WeinvestigateAsingle-,,wefindthatthepeakcouplingefficiencyincreasesby9and14dB,-%-AwavelengthThecouplerhasaspecialfeaturewhereincouplingdegradationcausedbyfiberdis-,(WDM)(WDM)systemhaveincreasedinrecentyears,Recent]ythewave!ength^selectivecouplerbasedontwoparallelLPFGswasproposed,butexperimentalproofwasnotclearlydemonstrated[8-9].(ADM)basedonLPFGsusingthecladdingmodecoupling[10].municationsystems,oneofthegreatestproblemsistoreducetheopticalcouplingarerequiredfbrfurtherdevelop
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