Optical transmission syster 皿 s based on optical fibers are attraetive as high − speed and large − capaCity tra 口] smisSion methods , It is necessaly fbr designing 曲 ch optical transmission systems to consider the i 1uence of optica 正 ren tions ind ロ ced hl transmlssion paths . We experimentally investigated the transmiss 三 〇n characteristics of a optical transmission systeni ( RIN , CTB , ℃ SO , XM )under the齟 uence of optioal re且cction . in order to satisfy the spec 笛 cations fbr optical CATV

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... systems , direct reflection signals into LD shoUld be suppressed below − 40dB a皿 d mUltiple reflect童 o 艮 signa 畏 s into PD should be s叩 pressed be】 ow ・ 50dB. The usc of optical isolat6 蜜 s is effectiV ' e to suppress the reflection into the , LD . 翫 e inc 爬 ase ofdis ‡ ortion ( CTB, CSO , XM ) can be, suppressed as the delay times ls mcreasm9