Abstract
The geometry of photonic crystal waveguides with ring-shaped holes is optimized to minimize dispersion in the slow light regime. We found geometries with a nearly constant group index in excess of 20 over a wavelength range of 8 nm. The origin of the low dispersion is related to the widening of the propagating mode close to the lower band gap edge.
Highlights
Photonic crystal waveguides (PhCW’s) have very different dispersion properties compared to conventional waveguides due to their periodic boundaries
Our approach is to use photonic crystal waveguides with ring-shaped holes (RPhCW’s) [9][12], for which we have measured a group index up to 20 [11]
We showed that photonic crystal waveguides with ring-shaped holes enable dispersion tailored slow light structures
Summary
Photonic crystal waveguides (PhCW’s) have very different dispersion properties compared to conventional waveguides due to their periodic boundaries. PhCW’s exhibit slow group velocity near the Brillouin zone edge [1]-[5]. The slow modes usually have a very high group velocity dispersion (GVD), which leads to optical signal degradation in telecommunications systems. Our approach is to use photonic crystal waveguides with ring-shaped holes (RPhCW’s) [9][12], for which we have measured a group index up to 20 [11]. Due to an extra free parameter in the lattice design, PhCs with ring-shaped holes allow fine-tuning of the waveguide dispersion properties. In this paper we optimize the ring dimensions so that W1 waveguides show minimal dispersion with a relatively high group index
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