Abstract-Terahertz-bandwidth photonic fractional Hilbert transformer based on a phase-shifted waveguide Bragg grating on silicon

Maurizio Burla, Ming Li, Luis Romero Cortés, Xu Wang, María Rosario Fernández-Ruiz, Lukas Chrostowski, and José Azaña  »View Author Affiliations Optics Letters, Vol. 39, Issue 21, pp. 6241-6244 (2014) http://dx.doi.org/10.1364/OL.39.006241

http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-39-21-6241

We propose and experimentally demonstrate the first THz bandwidth on-chip photonic fractional Hilbert transformer. The reported design uses a novel approach, based on a uniform and nonapodized single phase-shifted integrated waveguide Bragg grating on silicon, where the fractional order P can be engineered by simply varying the effective index modulation δn. Experimental results for P=1.5 show very low processing error for a broad range of pulse bandwidths between 77 GHz and 2.07 THz, corresponding to a time-bandwidth product as high as 27.

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