Abstract
We report, for the first time, an integrated photonic signal processor consisting of a reconfigurable optical delay line (ODL) with a separate carrier tuning (SCT) unit and an optical sideband filter on a single CMOS compatible photonic chip. The processing functionalities are carried out with optical ring resonators as building blocks. We show that the integrated approach together with the use of SCT technique allows the implementation of a wideband, fully-tunable ODL with reduced complexity. To highlight the functionalities of the processor, we demonstrate a reconfigurable microwave photonic filter where the ODL has been configured in a bandwidth over 1 GHz.
Highlights
Reconfigurable optical delay lines (ODL) and wideband tunable phase shifters have primary importance in a number of microwave photonic (MWP) signal processing applications like filtering [1,2,3,4], arbitrary waveform generation [5] or control of wideband phased-array antennas [6, 7]
In this work we propose and experimentally demonstrate a scheme where the ODL, the separate carrier tuning (SCT) and the optical sideband filter (OSBF) necessary to create the OSSB+C spectrum are integrated in a single CMOS compatible photonic chip
We have experimentally demonstrated a reconfigurable ODL based on the SCT technique where, for the first time, all the required components are integrated on a single photonic chip
Summary
Reconfigurable optical delay lines (ODL) and wideband tunable phase shifters have primary importance in a number of microwave photonic (MWP) signal processing applications like filtering [1,2,3,4], arbitrary waveform generation [5] or control of wideband phased-array antennas [6, 7]. As for the optical carrier, a separate component is used to apply the correct phase shift as it would experience when an ideal delay unit with a linear phase slope over the whole frequency range is employed (Fig. 1) With this scheme, the delay bandwidth of the ODL is independent of the absolute RF frequency. In this work we propose and experimentally demonstrate a scheme where the ODL, the SCT and the optical sideband filter (OSBF) necessary to create the OSSB+C spectrum are integrated in a single CMOS compatible photonic chip This approach brings advantages in terms of compactness together with wideband performance and full tunability. The details on SCT technique applied to delay lines based on SBS in optical fibers can be found in [13]
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