The power penalty of direct modulation is smaller than that of externalmodulation at the same crosstalk level.
在相同串扰水平情况下，直接调制的功率代价小于外调制的功率代价。
2
An externalmodulation laser technology of electro-optical modulation technique has been widely used because of its advantages which can not be got by others.
其中光外调制技术中的铌酸锂电光调制技术因其具有其它调制方式所不及的优点而被广泛应用。
3
Modulation is used to control or throttle flow in response to an external control signal.