Multiple Mode Couplings in a Waveguide Array for Broadband Near-Zero Dispersion and Supercontinuum Generation
Multiple Mode Couplings in a Waveguide Array for Broadband Near-Zero Dispersion and Supercontinuum Generation
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DOI：
10.1109/jlt.2020.3026634
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发表时间：
2021-01
影响因子：
4.7
通讯作者：
Saleha Fatema;Md Borhan Mia;Sangsik Kim
中科院分区：
文献类型：
--
作者：
Saleha Fatema;Md Borhan Mia;Sangsik Kim
我们利用多模耦合在近红外薄氮化硅波导阵列中实现了宽带近零色散。不同阶数的模式在四个不同波长处耦合，产生八个零色散波长 (ZDW)。实现了 90 ps/nm/km 内的宽带近零色散分布，跨越 1350-1900 nm 的光谱范围。使用色散工程波导阵列，使用 100 fs 和 200 pJ 的泵浦以数值方式生成倍频程超连续谱。通过设计结构参数来移动 ZDW 的位置，使用多模耦合获得宽带近零色散的概念也可以应用于其他光谱范围和材料平台。
We achieve a broadband near-zero dispersion in a thin silicon nitride waveguide array at near-infrared utilizing the multiple mode couplings. Different orders of modes are coupled at four different wavelengths, generating eight zero dispersion wavelengths (ZDWs). The broadband near-zero dispersion profile within 90 ps/nm/km is achieved, spanning over the spectral range of 1350$-$1900 nm. Using the dispersion engineered waveguide array, an octave-spanning supercontinuum is numerically generated with a pump of 100 fs and 200 pJ. The concept of using multiple mode couplings to obtain broadband near-zero dispersion can be applied to other spectral regimes and material platforms as well, by engineering the structural parameters to shift the positions of the ZDWs.