Ultracompact multimode interference coupler designed by parallel particle swarm optimization with parallel finite-difference Time-Domain

Qian Wang*, S. T. Ho

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

An ultra-compact multimode interference (MMI) coupler with a length ∼10 μm for dense photonic integration is designed by parallel particle swarm optimization (PSO) with parallel finite-difference time-domain (FDTD). The MMI coupler uses a strongly-guiding deep-etched InP platform and the modal analysis of this strongly-guiding deep-etched InP waveguide gives the cross section of the single-mode nanophotonic waveguide, the geometry of the multimode interference region, and the etched-depth requirement. An efficient global optimizer combining parallel PSO algorithm and parallel FDTD is developed, which speedups the optimization and enables automatic nanophotonic design. Two 2×2 multimode interference couplers with a respective coupling ratio of 50%:50% and 90%:10% are designed as numerical examples using the global optimizer developed and the optimization result shows a ultra-compact multimode interference coupler with a length of ∼10 μm can be achieved with a low excess loss, which is numerically verified by a parallel three-dimensional FDTD.

Original languageEnglish (US)
Article number5404802
Pages (from-to)1298-1304
Number of pages7
JournalJournal of Lightwave Technology
Volume28
Issue number9
DOIs
StatePublished - 2010

Keywords

  • Finite-difference-time-domain
  • Multimode interference coupler
  • Parallelization
  • Particle swarm optimization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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