Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Århus C, Denmark.
Opt Lett. 2011 Aug 15;36(16):3058-60. doi: 10.1364/OL.36.003058.
The power imbalance between different waveguide outputs is compensated by manipulating the dispersion of the guided propagation in the multimode interference (MMI) region. This is attainable using a tapered region at the beginning of the MMI region that has been verified through simulation and experiment. From this, the fabrication tolerance for the diameters of holes in a tapered 1×3 photonic crystal waveguide (PhCW) splitter is relaxed up to a range of at least 27 nm. The output power is well-balanced to within 1 dB. The effective bandwidth of the splitters shifts only around 13 nm, for a reduction of 10 nm in the diameter of the PhCW holes. The optimized component is an outstanding ultracompact 1×3 splitter for the photonic integrated circuit (PIC).
通过在多模干涉（MMI）区域中控制导波传播的色散，可以补偿不同波导输出之间的功率不平衡。这可以通过在 MMI 区域的起始处使用锥形区域来实现，已经通过仿真和实验进行了验证。由此，锥形 1×3 光子晶体波导（PhCW）分束器中孔直径的制造公差放宽到至少 27nm 的范围。输出功率在 1dB 以内得到很好的平衡。对于 PhCW 孔直径减小 10nm，分束器的有效带宽仅移动约 13nm。优化后的组件是光子集成电路（PIC）中出色的超紧凑 1×3 分束器。
