In this study, the effect of the shift in the refractive index between two dispersive elements on the output phase-conjugated (PC) wave power of waveband-shift-free optical-phase conjugators based on difference-frequency generation (DFG-OPCs) is analyzed. First, a numerical model of the DFG-OPC is built by considering the shift ∆n in the refractive index. The derived formula shows that the output PC wave power of DFG-OPCs depends on the shift in the refractive index. Subsequently, the dependence of the output PC wave power on the shift is confirmed analytically. Calculations indicate that the output PC wave power varies according to the shift. For a relatively fractional shift ∆n = 1.0e-6, the output PC power is degraded by 3 dB. Finally, acceptable values of the shift and temperature difference are calculated as functions of the length of the dispersive element. It is illustrated in this study that the acceptable value of shift in the refractive index increases as the length of the dispersive element is reduced and that the output PC wave power can be stabilized against changes in temperature.

在这项研究中，两个色散元件之间的折射率偏移对基于差频生成（DFG-OPC）的无频带偏移光相位共轭器的输出相位共轭（PC）波功率的影响为分析。首先，通过考虑折射率的变化Δn建立DFG-OPC的数值模型。推导的公式表明，DFG-OPC的输出PC波功率取决于折射率的变化。随后，通过分析确定输出的PC波功率对偏移的依赖性。计算表明，输出PC波功率随位移而变化。对于相对分数的变化∆ n = 1.0e-6时，输出PC功率降低3 dB。最后，根据分散元件的长度来计算可接受的位移和温度差值。在这项研究中表明，随着色散元件长度的减小，折射率变化的可接受值会增加，并且可以稳定输出PC波功率以抵抗温度变化。