（）is an auxiliary light source of EDFA. It causes the erbium icons of an erbium doped fiber to come from E1 to E3 quantum level.
正确答案:Pump laser
答案解析:有
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（）is an auxiliary light source of EDFA. It causes the erbium icons of an erbium doped fiber to come from E1 to E3 quantum level.
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