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 article 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 6.3 V, and Gv_σ / V_π = 0.73 ± 0.03. Even greater tolerances can be achieved with a higher V_sat (21 V), lower V_π (3.5 V), and Gv_σ / V_π ≈ 3.2 ± 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.

中文翻译：

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通过噪声进行相位调制加宽的激光器中相干抑制的优化

可以使用电光相位调制器（EOM）将相位噪声调制到激光器的输出上，以创建具有低强度噪声的高度不相干的加宽光源。这种技术只留下很小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，对于任意噪声概率密度函数，可以计算出通过此技术加宽的激光器中的载流子抑制。可以通过调整噪声电压标准偏差来通过实验改变载流子抑制提起笔_σ 和饱和电压 V_坐放大驱动EOM的噪声源的放大器。仿真表明，对于合理的容差，可以实现优于-30 dB的抑制。提起笔_σ ，例如带有 V _π 4.7 V，一个 V_坐 6.3 V，和 提起笔_σ / V _π= 0.73±0.03。更高的公差可以实现更高的公差。V_坐 （21 V），更低 V _π （3.5 V），和 提起笔_σ / V _π≈3.2±2.3。该模型有助于选择这些参数，以使载流子抑制可抵抗由于温度变化和组件老化而引起的这些电压波动。通过对光纤陀螺仪进行测试，验证了模型预测的正确性，该陀螺仪被加宽了激光，用于各种提起笔_σ 和 V_坐并从其测得的噪声中推断出载波抑制。对于具有以下特性的非线性放大器，观察到了-44dB的载波抑制提起笔_σ = 3.43 V， V_坐 = 6.3 V，并且EOM具有 V _π = 4.7 V，与预测一致。