Fine Resolution Photonic Spectral Processor Using a Waveguide Grating Router with Permanent Phase Trimming

Noam Goldshtein, David Sinefeld, Ori Ori, Roy Rudnick, Leonid Pascar, Roy Zektzer, Dan M. Marom

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Spectrally dispersed light from a fine resolution waveguide grating router (WGR) of 25-GHz free spectral range that radiates to free space is spatially filtered at ∼1 GHz optical resolution and 50 MHz spectral addressability using a liquid crystal on Silicon (LCoS) spatial light modulator (SLM). Fabrication imperfections leading to phase errors on the 32 waveguide arms of the WGR are corrected using a UV pulsed laser to inscribe permanent optical path changes to the waveguides. WGR phase errors are permanently trimmed waveguide-by-waveguide with an excimer laser by inducing stress in the glass cladding above the waveguide for coarse setting and using the photosensitivity effect for fine setting. The WGR was then mated with an LCoS SLM located at the Fourier plane to form a photonic spectral processor, for arbitrary spectral amplitude and phase manipulations.

Original languageAmerican English
Article number7358043
Pages (from-to)379-385
Number of pages7
JournalJournal of Lightwave Technology
Volume34
Issue number2
DOIs
StatePublished - 15 Jan 2016

Bibliographical note

Publisher Copyright:
© 1983-2012 IEEE.

Keywords

  • Optical communication
  • Optical filters
  • Optical planar waveguide components
  • Optical waveguide components
  • Wavelength division multiplexing

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