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Phase controlled integrated interferometric single-sideband filter based on planar Bragg gratings implementing

Chaotan Sima1, J C Gates, H L Rogers

  • 1Optoelectronics Research Centre, University of Southampton, Southampton, UK. Chaotan.Sima@soton.ac.uk

Optics Letters
|March 5, 2013
PubMed
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This study presents an all-optical single-sideband (SSB) filter using photonic Hilbert transform and Bragg gratings. The device achieves 12 dB SSB suppression and sideband switching through thermal tuning.

Area of Science:

  • Photonics
  • Optical Engineering
  • Materials Science

Background:

  • Integrated photonic devices are crucial for advanced optical signal processing.
  • Single-sideband (SSB) modulation is essential for efficient communication systems.
  • Photonic Hilbert transforms offer a novel approach to SSB filtering.

Purpose of the Study:

  • To propose and demonstrate a monolithically integrated all-optical SSB filter.
  • To achieve high SSB suppression and tunable sideband switching.
  • To utilize photonic Hilbert transform and Bragg gratings for compact device design.

Main Methods:

  • Device fabrication using silicon-on-silica substrate, direct UV grating writing, and photolithography.
  • Integration of X-coupler, photonic Hilbert transformer, flat top reflector, and micro heater.

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  • Thermal tuning of the device via a micro heater for controlling optical characteristics.

    • Main Results:

    • Experimental demonstration of the monolithically integrated all-optical SSB filter.
    • Achieved SSB suppression of 12 dB at 6 GHz.
    • Successful sideband switching demonstrated through thermal tuning.

    Conclusions:

    • The proposed device offers a compact and efficient solution for all-optical SSB filtering.
    • Thermal tuning provides a practical method for controlling filter performance and enabling sideband switching.
    • The integration of advanced photonic components on a single substrate paves the way for next-generation optical communication systems.