Frequency stabilization of laser diode by using an Etalon pair

半导体激光器的振荡频率根据漂移电流和温度而变化很大。因此，在相干光波通信系统中，半导体激光器的振荡频率的稳定化是一个大问题，迄今为止，上述稳定化是利用原子或分子的共振频率来实现的。虽然这种方法产生了良好的稳定性，但是谐振频率变得固定，即它不能改变。在本研究中，我们使用法布里-珀罗标准具对作为频率标准，并使用标准具对的谐振频率响应的交叉点作为稳定点。因此，通过改变标准具的厚度，我们可以获得任意的稳频，一个标准具对比一个标准具对的频率稳定度提高了一位数左右。

The oscillation frequency of a semiconductor laser changes greatly depending on the drift current and the temperature. For this reason, the stabilization of the oscillation frequency of the semiconductor laser is a big problem in coherent light wave communication systems.Until now, the above-mentioned stabilization was done using the resonant frequency of atoms or molecules. Though this method yields good stabilization, however the resonant frequency becomes fixed, that is, it cannot be changed.In this research, we used the Fabry-Perot Etalon pair as a frequency standard, and used the cross-point of the resonant frequency response of the Etalon pair as a stabilizing point. Thus, by varying the thickness of the Etalon, we obtain any stabilizing frequency.An Etalon pair is compared with a single Etalon and the frequency stabihty was improved by about one digit.