资 源 简 介
应用简介
音频放大器驱动热电冷却器OC-48激光模块
激光设计师面临的共同问题光纤通信系统保持激光器的特性温度。随着温度的漂移激光器的中心频率也会漂移。为了防止这个不必要的频率漂移，现代固态激光器模块热电冷却器（TEC），既可以泵出的热量，进入模块，从而调节温度。热电冷却器工作的珀耳帖效应。当DC电流流经TEC器件，热量为从TEC的一侧转移到其他。这将创建一个“热”和“冷”侧该装置。如果DC电流被逆转，则热冷侧反。这提供了一个激光加热或冷却的理想方法模块。然而，TEC必须驱动允许单位加热的差分方式或冷却激光器。
To provide a method of first order feedback， an integral thermistor is used to monitor the temperature of the laser. The manufacturer of the laser module typically trims the value of the thermistor to a specific value at the correct temperature of operaTIon providing a simple method of controlling the thermoelectric cooler. Typically， a closed-loop control system and power amplifier is used to drive current through the TEC. Other methods use pulse width modulaTIon and an H-Bridge， however the noise generated by this method may not be acceptable.
