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本文从我国“九五”期间发展光纤同轴电缆混合网的实际出发，介绍光纤网中最关键的激光发射机。本文以分布反馈（ＤＦＢ）调幅激光发射机为例，介绍激光器的构造和分布反馈激光发射主件的构成，阐述了ＤＦＢ调幅激光发射机的设计思想，指出ＤＦＢ调幅激光发射机中具备自动光功率控制、自动温度控制及自动增益控制的重要性和这些控制的理论依据以及具体电路的实现。
This article from the actual development of our country “Ninth Five-Year” development of optical fiber coaxial cable hybrid network, introduces the most critical laser transmitter in optical network. In this paper, the DFB amplitude modulated laser transmitter is taken as an example to introduce the structure of the laser and the main components of distributed feedback laser emission. The design principle of the DFB amplitude modulated laser transmitter is expounded. The DFB amplitude modulated laser transmitter with automatic optical power Control, the importance of automatic temperature control and automatic gain control and the theoretical basis of these controls as well as the realization of specific circuits.