Sánchez C, Ortega B, Wei J L, Capmany J
Opt Express. 2013 Dec 16;21(25):30591-609. doi: 10.1364/OE.21.030591.
This work presents a theoretical investigation on the performance of directly modulated/detected (DM/DD) optical orthogonal frequency division multiplexed (OOFDM) systems subject to optical filtering. The impact of both linear and nonlinear distortion effects are taken into account to calculate the effective signal-to-noise ratio of each subcarrier. These results are then employed to optimize the design parameters of two simple optical filtering structures: a Mach Zehnder interferometer and a uniform fiber Bragg grating, leading to a significant optical power budget improvement given by 3.3 and 3dB, respectively. These can be further increased to 5.5 and 4.2dB respectively when balanced detection configurations are employed. We find as well that this improvement is highly dependent on the clipping ratio.
这项工作对受光滤波影响的直接调制/检测（DM/DD）光正交频分复用（OOFDM）系统的性能进行了理论研究。考虑了线性和非线性失真效应的影响，以计算每个子载波的有效信噪比。然后利用这些结果优化两种简单光滤波结构的设计参数：马赫曾德尔干涉仪和均匀光纤布拉格光栅，分别使光功率预算显著提高3.3dB和3dB。当采用平衡检测配置时，这些值可分别进一步提高到5.5dB和4.2dB。我们还发现，这种改善高度依赖于削波比。
