Chack Devendra, Hassan Shamsul, Qasim Mohd
Appl Opt. 2020 Apr 20;59(12):3652-3659. doi: 10.1364/AO.390085.
In this paper, a compact and broadband mode converter and demultiplexer based on multimode interference (MMI) is designed and experimentally demonstrated on silicon-on-insulator. We have designed a mode converter using cascaded MMI to convert the fundamental mode into a higher-order (first-order mode) and vice versa. Subsequently, we have demonstrated an on-chip two-mode demultiplexer with a compact footprint and low loss. The proposed mode demultiplexer shows low insertion loss (0.22 dB for ${{\rm TE}_0}$TE and 0.36 dB for ${{\rm TE}_1}$TE mode) and crosstalk (${-}{25.2};{\rm dB}$-25.2dB for ${{\rm TE}_0}$TE and ${-}{24.4};{\rm dB}$-24.4dB for ${{\rm TE}_1}$TE mode) at wavelength 1550 nm using the eigenmode expansion method. Moreover, the device supports a broad bandwidth having crosstalk ${ \lt } {-} {20};{\rm dB}$<-20dB over a wavelength range of 1520-1580 nm. The proposed device can be used in mode division multiplexing for photonic network-on-chip.
本文设计了一种基于多模干涉（MMI）的紧凑型宽带模式转换器和解复用器，并在绝缘体上硅结构上进行了实验验证。我们设计了一种采用级联MMI的模式转换器，用于将基模转换为高阶模（一阶模），反之亦然。随后，我们展示了一种具有紧凑尺寸和低损耗的片上双模式解复用器。所提出的模式解复用器在1550 nm波长下，采用本征模展开法时，插入损耗较低（TE₀模为0.22 dB，TE₁模为0.36 dB），串扰也较低（TE₀模为-25.2 dB，TE₁模为-24.4 dB）。此外，该器件在1520 - 1580 nm波长范围内支持较宽的带宽，串扰小于-20 dB。所提出的器件可用于光子片上网络的模式分割复用。
