A novel direct binary search algorithm based on rotation (RDBS) is proposed in this paper. A 1*2 ultra-compact 2.4*3.6µm multimode wavelength demultiplexer (DEMUX) is designed in reverse, which is roughly two orders of magnitude smaller than the size of a conventional waveguide device. It can simultaneously perform wavelength demultiplexing and mode conversion. This DEMUX separates the 1310 and 1550 nm wavelengths while converting the input light from the fundamental transverse electric mode (TE0) to the first-order transverse electric mode (TE1). The simulation results using RDBS show that the insertion loss() of the upper channel (wavelength 1310 nm) is −0.9644 dB, the of the lower channel (wavelength 1550 nm) is −0.9752 dB, and the crosstalk values(CT) are −10.079 dB and −9.261 dB, respectively.

中文翻译：

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多功能解复用装置的逆向设计

本文提出了一种基于旋转的直接二分搜索算法（RDBS）。反向设计了1*2超紧凑2.4*3.6μm多模波长解复用器（DEMUX），其尺寸比传统波导器件的尺寸大约小两个数量级。它可以同时进行波长解复用和模式转换。该 DEMUX 分离 1310 和 1550 nm 波长，同时将输入光从基本横电模式 (TE0) 转换为一阶横电模式 (TE1)。使用RDBS的仿真结果表明，上通道（波长1310 nm）的插入损耗（）为-0.9644 dB，下通道（波长1550 nm）的插入损耗（）为-0.9752 dB，串扰值（CT）为-分别为 10.079 dB 和 -9.261 dB。