We propose the asymmetric direct detection (ADD) of twin-single sideband (SSB) signals based on a simple receiver front-end composed of one optical filter and two photodiodes. ADD exploits the photocurrent difference between a filtered and unfiltered signal pair to reconstruct and linearize the received twin-SSB signal with a high electrical spectral efficiency (ESE). We evaluate the performance impact of the critical system parameters on ADD and demonstrate 231 Gb/s net rate 16-QAM twin-SSB transmission with 6.03 b/s/Hz ESE over an 80 km standard single-mode fiber below the ${1} \times {{10}^{ - 2}}$1×10-2 hard-decision forward error correction threshold. We also found that the bit error rate performance of ADD is robust against the relative center wavelength drifting of the optical filter.

中文翻译：

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双SSB信号的非对称直接检测。

我们提出了一种基于一个由一个光学滤波器和两个光电二极管组成的简单接收机前端的双单边带（SSB）信号的非对称直接检测（ADD）。ADD利用经过滤波和未经滤波的信号对之间的光电流差异，以高频谱效率（ESE）重建并线性化接收到的双SSB信号。我们评估了关键系统参数对ADD的性能影响，并演示了在$ {1}以下的80 km标准单模光纤上以6.03 b / s / Hz ESE进行的231 Gb / s净速率16-QAM双SSB传输。 \ times {{10} ^ {-2}} $ 1×10-2硬判决前向纠错阈值。我们还发现，ADD的误码率性能对于滤光片的相对中心波长漂移具有鲁棒性。