title: Relaxed fabrication tolerance for self-imaging photonic crystal waveguide splitters using a tapered multimode interference region.
abstract: 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).
authors.affiliation: Interdisciplinary Nanoscience Center, Aarhus University, DK-8000 Århus C, Denmark. minz@inano.dk
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Asger
authors.initials: A
authors.lastname: Christian Krüger
authors.forename: Nathaniel
authors.initials: N
authors.lastname: Groothoff
authors.forename: Thomas
authors.initials: T
authors.lastname: Balle
authors.forename: Martin
authors.initials: M
authors.lastname: Kristensen