Thecriticalfindingsassociatedwithend-facetotalinternalreflection(TIR)phenomemonweprovedbeforearereported.Inparticular,thesefindingsrevealthattheend-face-TIRcapableraysexperienceenormousmodemixingwhenencounteringaroughenedendface.Asaresult,94%oftheoveralldetectablepoweriscontributedbythiseffect.Withasmoothfiberendface,thisfigureismere52%.Weinterpretthemechanismbehindtheseunusualphenomenaanditssignificancefortheperformancee
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