高斯噪声近似对光预放大平衡检波DPSK接收机的适用性
Applicability of Gaussian Noise Approximation for Optically Pre-Amplified DPSK Receivers with Balanced Detection
摘要：
这封信提出了一个精确的概率密度函数的比较与高斯噪声近似的光前置放大DPSK接收机与光学马赫-曾德尔干涉仪解调（MZI）和平衡检测，包括相位噪声的影响。研究发现，与ASE放大的自发发射的IM/DD接收机相比，在具有平衡检测的DPSK接收机中，特别是当相位噪声可以忽略时，高斯噪声近似显著地高估了ASE-ASE拍频噪声。然而，高斯噪声近似仍然适用于具有平衡检测的DPSK接收机，并且通过高斯噪声分布预测测量的3 dB优势。
英文摘要：
This letter presents a comparison of exact probability density function with the Gaussian noise approximation in optically pre-amplified DPSK receivers with optical Mach-Zehnder interferometer demodulation (MZI) and balanced detection, including the impact of phase noise. It is found that the Gaussian noise approximation significantly over-estimates ASE-ASE beat noise in DPSK receivers with balanced detection particularly when phase noise is negligible, compared to IM/DD receivers, ASE- amplified spontaneous emission. However, the Gaussian noise approximation is still applicable for DPSK receivers with balanced detection and the measured 3-dB advantage is predicted by the Gaussian noise distribution.
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