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Opt Lett. 2013 Sep 1;38(17):3448-51. doi: 10.1364/OL.38.003448.

Terahertz bandwidth photonic Hilbert transformers based on synthesized planar Bragg grating fabrication.

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Optoelectronics Research Centre, University of Southampton, Southampton, UK.


Terahertz bandwidth photonic Hilbert transformers are proposed and experimentally demonstrated. The integrated device is fabricated via a direct UV grating writing technique in a silica-on-silicon platform. The photonic Hilbert transformer operates at bandwidths of up to 2 THz (~16 nm) in the telecom band, a 10-fold greater bandwidth than any previously reported experimental approaches. Achieving this performance requires detailed knowledge of the system transfer function of the direct UV grating writing technique; this allows improved linearity and yields terahertz bandwidth Bragg gratings with improved spectral quality. By incorporating a flat-top reflector and Hilbert grating with a waveguide coupler, an ultrawideband all-optical single-sideband filter is demonstrated.


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