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Opt Express. 2011 Dec 5;19(25):24838-48. doi: 10.1364/OE.19.024838.

Impulse radio ultrawideband pulse shaper based on a programmable photonic chip frequency discriminator.

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  • 1Telecommunication Engineering group, University of Twente, Enschede, the Netherlands.


We report and experimentally demonstrate the generation of impulse radio ultrawideband (UWB) pulses using a photonic chip frequency discriminator. The discriminator consists of three add-drop optical ring resonators (ORRs) which are fully programmable using thermo-optical tuning. This discriminator chip in combination with a phase modulator forms a temporal differentiator where phase modulation is converted to intensity modulation (PM-IM conversion). By means of tailoring the discriminator response using either the individual or the cascade of drop and through responses of the ORRs, first-order or second-order temporal differentiations are obtained. Using this principle, the generation of UWB monocycle, doublet and modified doublet pulses are demonstrated. The use of this CMOS-compatible discriminator is promising for the realization of a compact and low cost UWB transmitter.

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