实现全光网络的核心器件是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28963' and id < 2357862 and id<>'2357862' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28963' and id > 2357862 and id<>'2357862' order by id asc limit 5