Abstract
We propose and experimentally demonstrate a photonic Hilbert transformer using an on-chip silicon photonic crystal nanocavity (PCN). We prove that a PCN can implement photonic Hilbert transformation after certain structure design. The PCN consists of a cavity of three-defect-long (L3) type with a lattice constant of
$a = 420$
nm and a hole radius of
$r/a = 0.3$
. We demonstrate Hilbert transformations of input Gaussian pulses with different pulsewidth, and all the average deviations are less than 5.8%. The PCN has a small size of 10 μm
$ \times$
10 μm, which may be useful in high-density on-chip spectral shaper.
© 2014 IEEE
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