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

机译：用峰值法通过直接FSK振荡频率稳定半导体激光器

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摘要

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.
机译：半导体激光器的振荡频率必须在使用这种装置的相干光通信系统中稳定，因为频率根据温度或喷射电流的变化波动。因此，我们设置了稳定它的任务，使用RB-D $ -2 $ /释放线作为外部频率参考和负反馈控制。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。虽然高敏感的控制确保了改进的信号稳定性，但是在直接FSK（频移键控）下频率稳定性劣化，因为半导体激光器的振荡谱变宽。因此，我们设计了“峰值方法”，这提高了直接FSK下的频率稳定性。频率稳定性的精确测量要求测量两个稳定激光频率，信号和参考激光器之间的节拍注意。但击败注意有时在我们的测量设备的极限之外。因此，通过使用磁光效应来调节参考激光频率，以控制在该工作的可测量范围内的节拍音符频率。我们计算了Allan方差的平方根来估计频率稳定性，从而确认峰值方法的有效性。

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