To maintain the constant average optical power and extiction ratio, the temperature compensation loop and automatic power control loop are incorporated in this chip.

为了保持工作中的稳定平均输出功率和恒定消光比，采用了温度补偿电路和自动功率控制电路。

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But to perfect the system performance, some accessorial circuits are necessary, such as automatic power control circuit, automatic temperature control circuit and protective circuit etc.

为了完善通信系统的性能，除了主干电路外，还必须加入一些附加电路，如自动功率控制电路、自动温度控制电路和保护电路等等。

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

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。

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