在用于光纤传输系统的几个功能电路中，构成光接收机前端放大电路的前置放大器和主放大器是两个关键电路。
In the building blocks of an optical transmission system, the pre-amplifier and the main amplifier are the critical parts.
光接收机前端放大电路主要由两个关键电路构成：前置放大器和主放大器。
The front-end amplifier for optical receiver is made up of two important circuits: preamplifier and main amplifier.
最后给出了主镜轻量化的典型应用实例，对其进行了光机热综合评估。
Finally a typical example of lightweight primary mirror is given, which is evaluated comprehensively on optics, mechanic...
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