Ozcan Can, Mojahedi Mo, Stewart Aitchison J
Opt Lett. 2023 Sep 15;48(18):4901-4904. doi: 10.1364/OL.500240.
Adiabatic Y-junction power splitters have low loss, large bandwidth, high polarization insensitivity, and high tolerance to fabrication errors. However, the adiabatic transition lengths required are generally much longer than other power splitters. Using a nonlinear taper profile can considerably shorten the device length. Here, we introduce a taper profile optimization algorithm based on polynomial functions, which significantly reduces the lengths of the adiabatic power splitters without increasing losses. We experimentally demonstrate the performance of the adiabatic power splitters for minimum feature sizes of 80 nm, 120 nm, and 160 nm on the 220 nm silicon-on-insulator (SOI) platform. Our best device has a minimum feature size of 120 nm and a length of 14 µm, with measured losses of 0.25 dB and 0.23 dB for the transverse electric (TE) and transverse magnetic (TM) modes, respectively, in the 1500-1600 nm region. This device has an average transmission of -3 ± 0.5 dB in the 1500-1600 nm region, indicating highly balanced splitting over a large spectral range.
绝热Y型结功率分配器具有低损耗、大带宽、高偏振不敏感性以及对制造误差的高容忍度。然而，所需的绝热过渡长度通常比其他功率分配器长得多。使用非线性渐变轮廓可以显著缩短器件长度。在此，我们介绍一种基于多项式函数的渐变轮廓优化算法，该算法在不增加损耗的情况下显著缩短了绝热功率分配器的长度。我们通过实验展示了在220nm绝缘体上硅（SOI）平台上，针对80nm、120nm和160nm的最小特征尺寸的绝热功率分配器的性能。我们最好的器件最小特征尺寸为120nm，长度为14μm，在1500 - 1600nm区域，横向电（TE）模式和横向磁（TM）模式的测量损耗分别为0.25dB和0.23dB。该器件在1500 - 1600nm区域的平均传输为 - 3 ± 0.5dB，表明在大光谱范围内具有高度平衡的分光。
