Topology-optimized silicon photonic wire mode (de)multiplexer

Louise Floor Frellsen, Lars Hagedorn Frandsen, Yunhong Ding, Yuriy Elesin, Ole Sigmund, Kresten Yvind

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We have designed and for the first time experimentally verified a topology optimized mode (de)multiplexer, which demultiplexes the fundamental and the first order mode of a double mode photonic wire to two separate single mode waveguides (and multiplexes vice versa). The device has a footprint of ~4.4 μm x ~2.8 μm and was fabricated for different design resolutions and design threshold values to verify the robustness of the structure to fabrication tolerances. The multiplexing functionality was confirmed by recording mode profiles using an infrared camera and vertical grating couplers. All structures were experimentally found to maintain functionality throughout a 100 nm wavelength range limited by available laser sources and insertion losses were generally lower than 1.3 dB. The cross talk was around -12 dB and the extinction ratio was measured to be better than 8 dB.
Original languageEnglish
Title of host publicationProceedings of SPIE
EditorsGraham T. Reed, Michael R. Watts
Number of pages9
PublisherSPIE - International Society for Optical Engineering
Publication date2015
Article number93670X-1
ISBN (Print)9781628414578
Publication statusPublished - 2015
EventSilicon Photonics X - San Francisco, California, United States
Duration: 9 Feb 201512 Feb 2015


ConferenceSilicon Photonics X
CountryUnited States
CitySan Francisco, California
SeriesProceedings of S P I E - International Society for Optical Engineering

Bibliographical note

Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Topology optimization
  • Space division multiplexing
  • Mode division multiplexing
  • Photonic integrated circuit

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