Wavelength‐division multiplexing passive optical network (WDM‐PON) is a promising solution to cope with the exponential data traffic growth, particularly regarding future mobile fronthaul. WDM‐PON schemes, based on self‐seeded wavelength agnostic transmitters using reflective semiconductor optical amplifiers (RSOAs), are seen as an option to provide an analog radio‐over‐fiber (A‐RoF) alternative to the current digital fronthaul. Although these A‐RoF have been already successfully demonstrated, it was observed that the arrayed waveguide grating (AWG)‐filtering characteristics affect both the optical seed generation and the radio signal integrity, requiring a design optimization. In order to do so, in this article, we optimize the A‐RoF transmission performance by comparing Bessel, Gaussian, and flat‐top AWG‐filter formats. The impact of seed linewidth and red‐shift on the signal error‐vector magnitude (EVM) and phase rotation is also investigated. We have found that EVM performance for BPSK and 16QAM transmission provided an improvement of 45% when compared to our previous results, with a phase offset of 0.8°, indicating little to no distortion, as a result of the selection of the optimal AWG filtering response.

中文翻译：

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针对波分复用无源光网络上的有效模拟无线光纤前传优化阵列波导光栅滤波响应

波分复用无源光网络（WDM-PON）是一种有希望的解决方案，可以应对指数数据流量的增长，尤其是在未来的移动前传方面。WDM-PON方案基于使用反射半导体光放大器（RSOA）的自播波长不可知发射器，被认为是提供一种替代当前数字前传的模拟无线光纤（A-RoF）的选择。尽管已经成功证明了这些A‐RoF，但是可以观察到，阵列波导光栅（AWG）的滤波特性会影响光种子的产生和无线电信号的完整性，因此需要进行设计优化。为此，在本文中，我们通过比较Bessel，高斯和平顶AWG滤波器格式来优化A-RoF传输性能。还研究了种子线宽和红移对信号误差矢量幅度（EVM）和相位旋转的影响。我们发现，通过选择最佳的AWG滤波响应，与之前的结果相比，BPSK和16QAM传输的EVM性能提高了45％，相位偏移为0.8°，表明几乎没有失真。 。