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Oscillation frequency stabilization of a semiconductor laser under direct FSK by using the PEAK method

机译：使用PEAK方法在直接FSK下半导体激光器的振荡频率稳定化

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Abstract: The oscillation frequency of a semiconductor laser must be stabilized in coherent optical communications systems that use such devices, because the frequency fluctuates according to variations in either temperature or injection current. Therefore, we set about the task of stabilizing it, using the Rb-D$-2$/ absorption line as an external frequency reference and negative feedback control. This method of stabilization requires the application of small sine wave modulation to obtain error signal by synchronous detection method. While the highly sensitive control ensures improved signal stability, frequency stability is deteriorated under direct FSK (Frequency Shift Keying), because the oscillation spectrum of a semiconductor laser is broadened. We, therefore, devised the `PEAK method', which improves frequency stability under direct FSK. The accurate measurement of frequency stability requires that the beat note between two stabilized laser frequencies, the signal and reference lasers, be measured. But beat note was sometimes outside the limits of our measuring equipment. The reference laser frequency was therefore adjusted by using the magneto-optical effect to control the beat note frequency within measurable limits of this work. We calculated the square root of the Allan variance to estimate the frequency stability, thereby confirming the effectiveness of PEAK method.!11
机译：摘要：在使用此类设备的相干光通信系统中，必须稳定半导体激光器的振荡频率，因为该频率会随温度或注入电流的变化而波动。因此，我们开始使用Rb-D $ -2 $ /吸收线作为外部频率参考和负反馈控制来稳定它。这种稳定方法需要应用小正弦波调制，以通过同步检测方法获得误差信号。虽然高灵敏度的控制确保了改善的信号稳定性，但由于半导体激光器的振荡频谱变宽，因此在直接FSK（频移键控）下频率稳定性会下降。因此，我们设计了“ PEAK方法”，可以改善直接FSK下的频率稳定性。频率稳定性的准确测量需要测量两个稳定的激光频率（信号和参考激光）之间的拍音。但是节拍音符有时超出了我们测量设备的范围。因此，通过使用磁光效应将拍子的频率控制在这项工作的可测量范围内，可以调整参考激光频率。我们计算了Allan方差的平方根以估计频率稳定性，从而确认了PEAK方法的有效性。！11

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