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arXiv 2211.04077physics.optics
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基于特殊曲线的双偏振超紧凑硅多模波导弯曲

Ultra-compact Silicon Multimode Waveguide Bends Based on Special Curves for Dual Polarizations

Juanli Wang, Shangsen Sun, Runsen Zhang, Fengchun Zhang, Ning Zhu

AI总结:

本文针对双偏振硅多模波导弯曲,比较自由曲线、贝塞尔曲线和欧拉曲线设计,发现基于自由曲线的6模MWB在1500-1600 nm波段损耗低于0.052 dB、串扰低于-25.97 dB,为偏振不敏感MDM-PDM集成光传输系统提供了高效设计方案。

摘要:

具有极紧凑尺寸的多模波导弯曲(MWBs)是不同模分复用(MDM)系统应用中的关键构建模块。为了进一步提高传输容量,考虑到硅波导中不同偏振下非常不同的模式行为,适用于双偏振的硅多模波导弯曲尤其值得关注。目前很少有同时适用于两种偏振的硅 MWBs 被研究。本文分析了基于不同弯曲曲线函数的几种双偏振 MWBs。与基于光栅等亚波长结构的其他结构相比,这些基于特殊曲线的硅 MWBs 具有易于制造和低损耗的优点。本文对自由曲线、贝塞尔曲线和欧拉曲线进行了比较,这些曲线被用于弯曲区域以替代传统圆弧。研究了芯层厚度为 340 nm 的硅多模波导中前三个 TE 和 TM 模式的透射光谱。仿真结果表明,在相同有效半径仅为 10 的前提下,基于自由曲线的 6 模 MWB 具有最优性能,在 1500-1600 nm 的宽频带内,所有六个模式的损耗极低,低于 0.052 dB,串扰低于 -25.97 dB。基于贝塞尔曲线和欧拉曲线的 MWBs 在损耗和串扰方面性能有所下降。本文的结果为偏振不敏感硅 MWBs 提供了一种高效的设计方法,这可能有助于推动结合 MDM 和偏振分复用(PDM)技术的复杂光传输系统的研究。

英文摘要:

The multimode waveguide bends (MWBs) with very compact sizes are the key building blocks in the applications of different mode-division multiplexing (MDM) systems. To further increase the transmission capacity, the silicon multimode waveguide bends for dual polarizations are of particular interest considering the very distinct mode behaviors under different polarizations in the silicon waveguides. Seldom silicon MWBs suitable for both polarizations have been studied. In this paper we analyze several dual-polarization-MWBs based on different bending curve functions. These special curve-based silicon MWBs have the advantages of easy fabrication and low loss compared with other structures based on the subwavelength structures such as gratings. A comparison is made between the free-form curve, Bezier curve, and Euler curve, which are used in the bending region instead of a conventional arc. The transmission spectra of the first three TE and TM modes in the silicon multimode waveguide with a core thickness of 340 nm are investigated. The simulation results indicate that in the premise of the same effective radius which is only 10 in this paper, the 6-mode MWB based on the free-form curve has the optimal performances, including an extremely low loss below 0.052dB and low crosstalk below -25.97dB for all six modes in the wide band of 1500-1600 nm. The MWBs based on the Bezier and Euler curve have degraded performances in terms of the loss and crosstalk. The results of this paper provide an efficient design method of the polarization insensitive silicon MWBs, which may leverage the researches for establishing complicated optical transmission systems incorporating both the MDM and polarization-division multiplexing (PDM) technology.

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