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利用光线理论分析弯曲光纤模型中的包层光线传输特性,结合半导体激光模块传能尾纤弯曲实验表明,由于光纤弯曲有效数值孔径减小而进入包层的光线并未完全被耗散,当光纤弯曲部分长度较短时,部分未耗散掉的包层光在进入直光纤部分后仍可重新回到纤芯中进而长距离传输作为有用光输出。该结论表明弯曲光纤的传输效率由弯曲半径和弯曲光纤长度共同决定,即在光纤弯曲半径远小于传统理论临界半径的情况下,合理控制传能光纤弯曲部分的长度,仍可获得较高的传输效率。
Using the theory of light to analyze the transmission characteristics of the cladding light in the bending fiber model, combined with the experiment of the fiber pigtail bending of the semiconductor laser module, the light entering the cladding is not completely dissipated because the effective numerical aperture of the fiber is reduced. When the length of the curved portion is short, a portion of the cladding light that has not been dissipated can still be returned to the core after entering the straight fiber portion for long-distance transmission as useful light output. The conclusion shows that the transmission efficiency of the bent fiber is determined by both the bending radius and the length of the bent fiber. That is to say, when the bending radius of the fiber is far less than the critical radius of the traditional theory, the transmission of the bent part of the fiber can be controlled reasonably. effectiveness.