光纤通信中传递光信号的光源是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29959' and id < 2428352 and id<>'2428352' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29959' and id > 2428352 and id<>'2428352' order by id asc limit 5