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Numerical modeling and analysis of a TM mode-division (de) multiplexer based on grating assisted couplers

机译：基于光栅辅助耦合器的TM模式分割（DE）多路复用器的数值建模与分析

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摘要

In this paper, a mode-division (de)multiplexer capable of multiplexing three transverse magnetic modes simultaneously at the operating wavelength of 1550 nm has been proposed. The device structure is designed using slab waveguides with Si and SiO_2 as core and cladding materials, respectively. Grating assisted couplers have been employed to couple the fundamental modes of two single-mode waveguides with the two higher-order modes of a multimode waveguide in the opposite direction. The fundamental mode of the multimode waveguide keeps propagating in the same waveguide without any power coupling to other modes. Using perturbation approach and coupled-mode theory, the proposed structure is theoretically analyzed. 2D Finite Difference Time Domain numerical simulation technique has been used to simulate and analyze the proposed mode division (de)multiplexer. During the demultiplexing operation, the proposed device exhibits insertion loss ranging from - 2.01 to - 0.01 dB, return loss ranging from - 31.07 to - 9.17 dB, and crosstalk in the range of - 41.76 to - 13.58 dB. Whereas for the multiplexing operation, insertion loss, return loss, and crosstalk range from - 1.59 to - 0.01 dB, - 31.07 to -10.17 dB, and - 41.76 to - 8.05 dB respectively.
机译：在本文中，已经提出了能够在1550nm的操作波长的同时复用三个横向磁性模式的模式分割（DE）多路复用器。该器件结构分别使用具有Si和SiO_2的平板波导作为芯和包层材料设计。已经采用光栅辅助耦合器将两个单模波导的基本模式与在相反方向相反的多模波形的两个高阶模式。多模波导的基本模式一直在相同的波导中传播，而不会与其他模式耦合任何电耦合。使用扰动方法和耦合模式理论，理论上分析了所提出的结构。 2D有限差分时域数值数值模拟技术已用于模拟和分析所提出的模式分割（DE）多路复用器。在解复用操作期间，所提出的装置表现出从-2.01至-01 dB的插入损耗，从-31.07至-9.17dB的返回损耗和串扰范围为-41.76至-13.58 dB。而对于复用操作，插入损耗，返回损耗和串扰范围为-1.59至-0.01 dB， - 31.07至-10.17 dB，分别为-41.76至-8.05 dB。

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