随机双折射对光孤子传输影响的研究  

Influence of Optical Soliton Transmission in a Random Birefringent Optical Fiber

作　　者：汪仲清[1] 罗习[2] 刘志伟[2] 曹昶[2] 邬墨家[2] 

机构地区：[1]重庆邮电大学数理学院 [2]重庆邮电大学光电工程学院,重庆400065

出　　处：《光子学报》2010年第10期1875-1880,共6页Acta Photonica Sinica

摘　　要：利用对称分步傅里叶法,数值模拟了光孤子在双折射光纤中的传输特性,分析了孤子脉冲两正交偏振分量的群速度失配对孤子传输产生的影响.结果表明,当光纤的双折射较小时,两偏振分量的脉冲强度变化不大,孤子基本能够保形传输;当光纤的双折射较大时,两偏振分量脉冲很快展宽,强度迅速减小,孤子不能够保形传输;如果光纤的双折射具有随机性,孤子传输的两偏振分量脉冲强度会随着传输距离有强弱不规则的变化,但是两偏振分量的强度变化互相补充,合成强度没有太大的变化,孤子能够稳定的传输;孤子间没有相互作用影响的传输距离随着光纤随机双折射偏振分量群速失配的增大而变小;通过选择恰当的振幅比,传统的不等振幅法仍然能够有效地抑制孤子间的相互作用.Symmetrical slit-step Fourier numerical method is used to simulate the soliton transmission properties in the fibers presenting birefringence.The inferences of the group velocity mismatch（GVM）,which denotes the magnitude of the birefringence,on the soliton transmission are analyzed.It is shown that the intensity of the two polarization component of the soliton are hardly varying when the GVM is small,and the soliton is undeformed on the whole in the transmission process.When the GVM is greater,the wider the width and the weaker the intensity of the soliton pulse become rapidly,and the soliton can not undeform transmission.If the birefringence of the fiber is randomly varying,the intensity of the two polarization component of the soliton is changed irregularly with the transmission distance,and the composite intensity of the soliton pulse is hardly varied as the two polarization component compensates each other.The interaction of solitons is influenced by the magnitude of the birefringence;the greater the GVM is,the shorter distance of the soliton with no-interaction.If amplitude rate is chosen appropriately,using the traditional unequal amplitude imputing method,it can still restrain the interaction of the solitons effectively.

关 键 词：随机双折射 光孤子 群速度失配 相互作用 不等振幅法 

分 类 号：TN929.11[电子电信—通信与信息系统]