半导体激光器的自动功率控制(APC)是光纤通信实用化过程中提出来的重要课题之一。

The APC (Automatic Power Control) of semiconductor lasers is an important issue in the practical fiber communication.

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这是因为POSIX允许这种可能性，即原始的进程间通信实现的可能性。

This is because POSIX allows this possibility to native interprocess communication implementations.

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在硬件处理中，用串行通信实现PC机与外部硬件的通信。

In hardware handling, realize the communication of PC and external hardware with serial communication.

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