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Broadband wavelength converters with flattop responses based on cascaded second-harmonic generation and difference frequency generation in Bessel-chirped gratings

机译:贝塞尔线性调频光栅中基于级联二次谐波产生和差分频率产生的具有平顶响应的宽带波长转换器

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摘要

We investigate ultra-broadband wavelength converters based on cascaded second-harmonic generation and difference frequency generation using Bessel-chirped gratings (BCGs) in lithium niobate waveguides, and compare them to the ones using uniform grating and segmented grating, respectively. For the same length and power, the BCGs show broader bandwidth than the other two types of grating. The ripple of the matching response is very small as well. Analysis also shows that almost the same conversion bandwidth and maximum conversion efficiency with tolerant response flatness can be achieved when the manufacturing tolerance of the waveguide length is smaller than 0.1 cm.
机译:我们研究了铌酸锂波导中基于贝塞尔线性调频光栅(BCG)的基于级联二次谐波生成和差分频率生成的超宽带波长转换器,并将它们分别与均匀光栅和分段光栅进行比较。对于相同的长度和功率,BCG显示出比其他两种类型的光栅更宽的带宽。匹配响应的波动也很小。分析还表明,当波导长度的制造公差小于0.1 cm时,可以实现几乎相同的转换带宽和最大转换效率以及可承受的响应平坦度。

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