Fiber-to-waveguide alignment assisted by a transparent integrated light monitor

Marco Carminati, Stefano Grillanda, Pietro Ciccarella, Giorgio Ferrari, Michael J. Strain, Marco Sampietro, Andrea Melloni, Francesco Morichetti

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
251 Downloads (Pure)


A novel fiber-to-waveguide alignment technique assisted by a transparent integrated light monitor is presented. The waveguide power is measured near the chip input facet by the contactless integrated photonic probe, which provides a feedback electrical signal steering the fiber positioning system. Automated single fiber to silicon nanowaveguide coupling is demonstrated with 40-nm resolution in a time scale of few seconds. The presented approach makes the fiber alignment procedure independent of the optical circuit integrated on the photonic chip, avoiding the need for simultaneous alignment of an output fiber, and thus easing optical chip characterization, wafer-level testing, and packaging of photonic devices.

Original languageEnglish
Article number6990520
Pages (from-to)510-513
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number5
Early online date18 Dec 2014
Publication statusPublished - 1 Mar 2015


  • integrated optics
  • optical fiber coupling
  • optical power monitor
  • optical waveguides
  • packaging
  • silicon photonics


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