轴向磁场对铌酸锂半波电压的影响

提出了平行与铌酸锂波导方向的轴向磁场对其半波电压产生影响的机理:加在电极上的电场对其中传播的偏振光产生线双折射,而磁场产生圆双折射,两者作用的结果是使得半波电压随磁场而变化。由此导出了半波电压随外界磁场变化的数学模型。仿真和实验结果表明,对于平均波长为1.30μm,20T的磁场,铌酸锂的半波电压可以减小了2.13%。

Influence of axial magnetic field on LiNbO3 modulator's half-wave voltage

The mechanism is put forward that the axial magnetic field parallel to the wave-guide of the LiNbO3 modulator may affect the half-wave voltage. The electric field acting on the electrode of the LiNbO3 crystal may bring linear birefringence to the polarized light propagating in LiNbO3 modulator, and the axial magnetic field may bring circular birefringence to it, too. So the acting result of the two types of birefringence makes the half-wave voltage vary with the magnetic field. The maths model about the variance that the half-wave voltage varies with the magnetic induction outside is set up. The simulation result and the examination result show that as to the light source whose wavelength is 1.30μm, when the magnetic induction changes about 20 Tesla, the half-wave voltage of LiNbO3 modulator may decrease 2.13%.