Mode-field Matching Down-Tapers on Single-Mode Optical Fibers for Edge Coupling Towards Generic Photonic Integrated Circuit Platforms

Koen Vanmol, Saurav Kumar, Vivek Panapakkam, Hugo Thienpont, Nathalie Vermeulen, Jan Watte, Jürgen Van Erps

Research output: Contribution to journalArticle

4 Citations (Scopus)
3 Downloads (Pure)

Abstract

Connections between standard single-mode fibers and waveguides in photonic integrated circuits tend to have relatively high coupling losses due to a difference in mode size and mode profile between both light guiding media. Edge coupling strategies involving specialty fibers are frequently used to obtain the best performance in terms of coupling efficiency, bandwidth and polarization independence. We propose the fabrication of free-standing down-taper structures on top of cleaved fiber facets by two-photon direct laser writing and show their performance for silicon, silicon nitride and indium phosphide generic chip platforms. We present a comprehensive analysis of the design of such taper structures that show unprecedented flexibility. We demonstrate their fabrication and fully characterize them in terms of output modal fields and coupling efficiencies. Furthermore, we experimentally compare the fabricated down-tapers with commercially available lensed fibers and demonstrate equal or better coupling efficiency for four out of the five investigated photonic integrated circuit platforms, with a measured improvement in coupling efficiency up to 1.43 dB.
Original languageEnglish
Pages (from-to)4834-4842
Number of pages9
JournalJournal of Lightwave Technology
Volume38
Issue number17
DOIs
Publication statusPublished - 1 Sep 2020

Keywords

  • WAVEGUIDE

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