n.衰减器
And it can be used as variable optical attenuator and electro-optic detector, too. 同时可以用作保偏可调光衰减器和电光探测器。
An amplifier or attenuator may be needed to ensure that the required level of power is transmitted through the switch. 可能就需要一个放大器或衰减器，以确保通过开关传输所需的功率。
