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光在聚合物光纤(POF)中传输时存在较强的模式耦合,由于模式耦合的影响,聚合物光纤的传输带宽得以提高。根据能流方程对阶跃型聚合物光纤光传输中的模式耦合进行了研究,从实验上测量了聚合物光纤的模式耦合系数,测量得到的模式耦合系数为7.61×10-4rad2/m。用测得的模式耦合系数对聚合物光纤中的模式耦合进行数值模拟,得到聚合物光纤的模式耦合长度约为20 m。由模式耦合长度可以得到聚合物光纤的真正带宽,其在150 m传输距离的带宽约为130 Mbit/s。为了验证这一结论,进行了125 Mbit/s.150 m的局域网(LAN)通信实验,通过对发射、接收波形及通信眼图的分析表明,由于模式耦合提高了聚合物光纤的传输带宽,使其可以在150 m的距离上进行百兆速率的通信传输。
There is a strong mode coupling between light and polymer fiber (POF). Due to the effect of mode coupling, the transmission bandwidth of polymer fiber is increased. The mode coupling in the step-type polymer optical fiber is studied based on the energy flow equation. The mode coupling coefficient of the polymer optical fiber is measured experimentally. The measured mode coupling coefficient is 7.61 × 10-4rad2 / m. The measured mode coupling coefficients were used to simulate the mode coupling in the polymer optical fiber. The theoretical coupling length of the polymer optical fiber was about 20 m. The true bandwidth of a polymer fiber is obtained from the mode coupling length, which is about 130 Mbit / s over a 150 m transmission distance. In order to verify this conclusion, a local area network (LAN) communication experiment at 125 Mbit / s and 150 m was carried out. Analysis of transmission, reception waveforms and communication eye diagrams shows that the transmission bandwidth of the polymer optical fiber is increased due to the mode coupling It is capable of 100-Mbit communication over distances of 150 m.