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本文描述了确保连续GaAs激光器和雪崩光电二极管APD的最佳和可靠的工作电路,并省去了实用光传输系统的调节程序。叙述了用光反馈来保证激光器恒定输出功率和调制深度的一些方法,并且与样品型号,温度变化及长时间的退化所引起的变化无关。还叙述了一种对APD偏置的奇特方法,即用恒流偏置来代替恒压偏置,因此,省掉了温度补偿和电源调节等等过程。光纤通讯系统中的许多电路类似于同轴系统中使用的电路。为了达到实用,有些元件要求新的电路技术,这些元件是指电光转换元件,即用来将电信号转换成光信号的光发射机,和将光信号转换成电信号的光接收机。
This article describes the best and reliable working circuits for ensuring continuous GaAs lasers and APDs for avalanche photodiodes and eliminates the need for a tuning routine for a practical optical transmission system. Some methods of using optical feedback to guarantee a constant output power and modulation depth of the laser are described, and are independent of changes in sample type, temperature, and long term degradation. A peculiar method of biasing the APD is also described, in which a constant current bias is used instead of a constant voltage bias, thereby eliminating the need for temperature compensation and power regulation. Many of the circuits in optical fiber communication systems are similar to the circuits used in coaxial systems. In order to be practical, some of the elements require new circuit technology. These elements refer to electro-optical conversion elements, that is, optical transmitters for converting electrical signals into optical signals, and optical receivers for converting optical signals into electrical signals.