Four-wave mixing in slow light photonic crystal waveguides with very high group index
Abstract
We report efficient four-wave mixing in dispersion engineered slow light silicon photonic crystal waveguides with a flat band group index of n(g) = 60. Using only 15 mW continuous wave coupled input power, we observe a conversion efficiency of -28 dB. This efficiency represents a 30 dB enhancement compared to a silicon nanowire of the same length. At higher powers, thermal redshifting due to linear absorption was found to detune the slow light regime preventing the expected improvement in efficiency. We then overcome this thermal limitation by using oxide-clad waveguides, which we demonstrate for group indices of n(g) = 30. Higher group indices may be achieved with oxide clad-waveguides, and we predict conversion efficiencies approaching -10 dB, which is equivalent to that already achieved in silicon nanowires but for a 50x shorter length.
Citation
Li , J , O'Faolain , L & Krauss , T F 2012 , ' Four-wave mixing in slow light photonic crystal waveguides with very high group index ' , Optics Express , vol. 20 , no. 16 , pp. 17474-17479 . https://doi.org/10.1364/OE.20.017474
Publication
Optics Express
Status
Peer reviewed
ISSN
1094-4087Type
Journal article
Description
This work was supported by the EPSRC - UK Silicon Photonics consortium.Collections
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