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 photonic crystal waveguide (PhCW) splitter is relaxed up to a range of at least . The output power is well-balanced to within . The effective bandwidth of the splitters shifts only around , for a reduction of in the diameter of the PhCW holes. The optimized component is an outstanding ultracompact splitter for the photonic integrated circuit (PIC).
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