光纤局域网论文英文文献

内容又长，专业性又强，翻译请放心，希望能加分。detectors. The spatial coherence distance in the turbulent atmosphere is modeled to be approximately , where is the path length and is the wavelength [4]. 探测器。在湍流大气中的空间相干距离被近似建模为……，其中（ ）是路径长度，（ ）是波长。This typically produces correlation distances in the range of 5 to 50 cm.这一般产生5到50 m范围的相关距离。 Thus, for small detectors spaced on the order of one meter, we can model the received field as spatially constant (though random) over any one detector aperture, while the path gains from any one source to various detectors are independent.因此，对于间隔在1 m量级的小探测器来说，我们可以将接收场建模为在任何一个探测器孔径上是空间不变的（尽管是随机的），同时，从任何一个光源到不同探测器的路径增益都是不相关的。 Finally, we assume the channel fading process is flat across the optical frequency band and slow relative to the symbol duration. 最后我们假设信道衰落过程跨光频带是平坦的，并与符号持续时间缓慢相关。The latter is justified by the high signaling speeds contemplated in FSO systems and the relatively slow dynamics of the channel turbulence, while the flat fading follows from the large coherence bandwidth relative to the laser linewidth and modulation rate. 后者由于（FSO）自由空间光通信系统设想的高信号速度和相对较慢的信道扰动动力学被认为是合理的，而平坦的衰落源自于相对于激光器线宽和调制速率较大的相干带宽。C. Optical Detection C. 光探测The photodetector analysis is based on a semi-classical treatment of photodetection, where the incident field is viewed as a wave, and this wave produces a modulated Poisson point process of photoelectrons that contribute to the detector current at the output. 光探测器的分析是基于光电探测器的半经典处理而进行的，其中，入射场被看作为一波动，而此波动使光电子产生一个受调制的泊松（Poisson)点过程，正是这些光电子对输出端的探测器电流做出了贡献。The rate of the Poisson process is proportional to the total power incident on the photodetector. 泊松过程的速率正比于入射到光电探测器上的总功率。The relevant theory is summarized here, with further details found in [25] and [26]. 有关的原理在这里加以归纳，进一步的细节请见文献【25】和【26】。We neglect additive thermal noise of receiver electronics, which is an idealization but one that can be approached with avalanche photodiodes (APDs) [27]. 我们忽略了接收机电子线路的额外热噪声，这是一种理想化的情况，但确是可以用雪崩光电二极管（APD）实现的【27】。Any dark currents in the detectors are assumed to be handled by injecting an equivalent level of background radiation.我们假设，探测器中的任何暗电流都通过注入一个等效电平的背景辐射来处理。 Extension of our transmission method to the case of thermal-noise-limited reception is found in [28]. 我们的传输方法扩展到热噪声限制接收情况下的报道可在文献【28】中看到。Each of the photodetectors forms an integral of its photodetected current over each of slots, or equivalently counts photoelectrons. 每个光电探测器都形成一个在每一个槽隙上其光电探测电流的积分，或者说等效数目的光电子。The probability mass function for the number of counts in an “on” interval is related to the optical intensity by the Poisson distribution [25]在一个“通”时间间隔内光电子计数的概率质量函数按泊松分布与光强有关。【25】

参见: 等.

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我先翻了第一段，你看可以我再接着翻~~（自己都看不下去）