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总结了多模光纤用于数据通信的优劣点,并分析多模光纤在未来高速大容量长距离无源光接入网(PON)中应用的可行性。从弱导光纤波导理论出发,忽略模内色散以及非线性效应的影响,建立多模光纤的简化模型,并在该简化多模光纤模型的基础上,采用仿真实验的方式,对一些改善多模光纤传输性能的技术:偏心注入,改变模斑尺寸,环形注入以及判决反馈均衡进行了分析,研究和比较。实验结果证明,采用模斑整形(主要是环形注入)与反馈均衡结合的方式可以有效地改善多模光纤的传输性能,使得10Gb/s信号在多模光纤中传输超过1km。
The advantages and disadvantages of multimode fiber used in data communication are summarized and the feasibility of multimode fiber used in PON with high speed and large capacity in the future is analyzed. Based on the theory of weak waveguide fiber waveguide, ignoring the influence of in-mold dispersion and nonlinear effect, a simplified model of multimode fiber is established. Based on the simplified multimode fiber model, a simulation experiment is carried out to improve the performance of multimode Fiber transmission performance of the technology: eccentric injection, change the size of the spot, ring injection and decision feedback equalization were analyzed, studied and compared. The experimental results show that the combination of modal shaping (mainly ring injection) and feedback equalization can effectively improve the transmission performance of multimode fiber and make the transmission of 10Gb / s signal exceed 1km in multimode fiber.