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对基于级联和频差频非线性效应铌酸锂光波导新型全光波长转换器进行了理论研究。这种新型波长变换器需要两束抽运光源,它将输入的抽运光波长置于信号光波段窗口的两边,抽运光波长与信号光波长相近容易实现最佳耦合又不会占用信号波段,而且具有偏振不敏感的优点。从建立级联和频差频铌酸锂光波导全光波长转换器的理论模型出发,给出了波导中光相互作用的耦合模方程;利用逐步法详细推导了耦合模方程的解,得出了物理意义清晰的转换光功率表达式,分析了非线性晶体相互作用长度、抽运光功率对转换效率的影响,为级联和频差频铌酸锂光波导全光波长转换器优化设计提供了理论依据。
A new type of all-optical wavelength converter based on cascaded and frequency-difference frequency non-linearity lithium niobate optical waveguide has been studied theoretically. This new type of wavelength converter requires two pump light sources that place the input pump light at the two sides of the signal light band window. The pump light wavelength is close to the signal light wavelength for easy coupling without occupying the signal band , But also has the advantage of polarization insensitivity. Starting from the theoretical model of cascaded and frequency-shifted all-optical wavelength converter of lithium niobate optical waveguide, the coupled-mode equations of optical interaction in waveguide are given. The solution of the coupled-mode equations is deduced in detail by stepwise method. The physical expression of the converted optical power is clearly analyzed. The influence of nonlinear crystal interaction length and pump power on the conversion efficiency is analyzed, which provides the optimal design for cascaded and frequency-shifted lithium niobate optical waveguide all-optical wavelength converter The theoretical basis.