带噪声相位调制展宽的Laser相干抑制的优化
Optimizing Coherence Suppression in a Laser Broadened by Phase Modulation with Noise
摘要：
利用电光相位调制器（EOM）可以将相位噪声调制到激光器的输出上，从而产生具有低强度噪声的高度非相干展宽光源。这种技术留下了一小部分但有限的相干载波功率，这在需要非相干光的应用中可能是非常有害的。本文表明，对于任意的噪声概率密度函数，可以计算用这种技术展宽的激光器中的载流子抑制。通过调整放大驱动EOM的噪声源的放大器的噪声电压标准偏差$Gv_σ$和饱和电压$V_{sat}$，可以通过实验改变载波抑制。仿真表明，对于$Gv_σ$中的合理公差，例如具有4.7 V的$V_π$、6.3 V的$V_{sat}$和$Gv_σ/V_π = 0.73\pm0.03$的EOM，可以获得优于-30 dB的支持。更高的$V_{sat}$（21 V）、更低的$V_π$（3.5 V）和$Gv_σ/V_π \approx 3.2 \pm 2.3$可实现更大的容差。该模型有助于选择这些参数，使得载波抑制对由于温度变化和部件老化而引起的这些电压的波动具有弹性。通过测试光纤陀螺仪，对不同的$Gv_σ$和$V_{sat}$用加宽的激光询问，并从其测量的噪声推断载波抑制，来验证模型预测。对于$Gv_σ$ = 3.43 V、$V_{sat}$ = 6.3 V的非线性放大器和$V_π$ = 4.7 V的EOM，观察到-44 dB载波抑制，与预测一致。
英文摘要：
Phase noise can be modulated onto the output of a laser with an electro-optic phase modulator (EOM) to create a highly incoherent broadened source with low intensity noise. This technique leaves a small but finite fraction of the coherent carrier power that can be highly detrimental in applications requiring incoherent light. This paper shows that the carrier suppression in a laser broadened by this technique can be calculated for an arbitrary noise probability density function. The carrier suppression can be varied experimentally by adjusting the noise voltage standard deviation $Gv_σ$ and saturation voltage $V_{sat}$ of the amplifier that amplifies the noise source that drives the EOM. Simulations show that suppressions better than -30 dB are attainable for reasonable tolerances in $Gv_σ$, for example an EOM with a $V_π$ of 4.7 V, a $V_{sat}$ of 6.3V, and $Gv_σ/V_π = 0.73\pm0.03$. Even greater tolerances can be achieved with a higher $V_{sat}$ (21 V), lower $V_π$ (3.5 V), and $Gv_σ/V_π \approx 3.2 \pm 2.3$. This model aids in selecting these parameters such that the carrier suppression is resilient to fluctuations in these voltages due to temperature variations and aging of the components. The model predictions are validated by testing a fiber optic gyroscope interrogated with a broadened laser for various $Gv_σ$ and $V_{sat}$ and inferring the carrier suppression from its measured noise. A -44-dB carrier suppression was observed for a nonlinear amplifier with $Gv_σ$ = 3.43 V, $V_{sat}$ = 6.3 V, and an EOM with $V_π$ = 4.7 V, in agreement with predictions.
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