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Ultracompact mode-order converting power splitter for mid-infrared wavelengths using an MMI coupler embedded with oblique subwavelength grating wires
Optics Communications ( IF 2.4 ) Pub Date : 2021-02-06 , DOI: 10.1016/j.optcom.2021.126850
Zhenzhao Guo , Jinbiao Xiao

An ultracompact mode-order converting power splitter using a multimode interference (MMI) coupler with subwavelength gratings (SWGs) is proposed for mid-infrared (MIR) wavelength. Two symmetric oblique SWG-wires are embedded in the central input-region that is connected with the input waveguide. As a result, the input TE0 mode is evenly coupled from the input waveguide into the MMI coupler due to the adiabatical mode evolution, and then two desired TE1 modes are formed via self-imaging effect and further guided into the two output channels. Additionally, tapered structures and straight SWG wires are introduced into the two output channels to better obtain the required phase difference for the improvement of converting efficiency. Consequently, both TE0-to-TE1 mode-order converting and power splitting, for the first time, are attained simultaneously in the present single device. Moreover, TE0-to-TE2 power splitting can be readily achieved by flexibly changing the dimensions of the proposed device. Results show that a compact device length of 7μm with an insertion loss (IL) of 0.41 dB, a conversion efficiency (CE) of 99% and a crosstalk (CT) of -19.77 dB is obtained at the wavelength of 2μm; its bandwidth can be enlarged to 220 nm for IL < 0.79 dB and CE> 91%. Besides, fabrication tolerances are addressed and mode propagation profiles are illustrated.



中文翻译:

使用嵌入斜亚波长光栅线的MMI耦合器为中红外波长提供超紧凑型模阶转换功率分配器

针对中红外(MIR)波长,提出了使用带有亚波长光栅(SWG)的多模干扰(MMI)耦合器的超紧凑型模阶转换功率分配器。两根对称的倾斜SWG导线嵌入与输入波导连接的中央输入区域。结果,由于绝热模式的演变,输入TE 0模式从输入波导均匀耦合到MMI耦合器中,然后通过自成像效应形成两个所需的TE 1模式,并进一步导入两个输出通道。另外,在两个输出通道中引入了锥形结构和SWG直导线,以更好地获得所需的相位差,从而提高了转换效率。因此,两个TE 0到TE1个在当前的单个设备中,同时实现了模式阶转换和功率分配。此外,通过灵活地改变所提出的装置的尺寸,可以容易地实现TE 0至TE 2的功率分配。结果表明,紧凑的设备长度为7μm的插入损耗(IL)为0.41 dB,在波长为0时获得的转换效率(CE)为99%,串扰(CT)为-19.77 dB。 2μm; 对于IL <0.79​​ dB和CE> 91%,其带宽可以扩大到220 nm。此外,解决了制造公差并图示了模式传播曲线。

更新日期:2021-02-23
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