23 February 2018 Silicon-photonic-assisted on-chip RF signal processing
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Abstract
We present a Silicon-photonic-assisted RF signal processing, in particular, frequency up conversion and RF pulse generation. For frequency up-conversion, we use compact silicon PN micro-ring modulator to frequency double the input RF signal. Experimentally we report an up-conversion of the baseband to a maximum of 12 GHz covering L, S, C and X band. We achieve a maximum suppression of 30 dB of the baseband at the output. The extinction could be improved by operating the ring modulator at the critical coupling. We present a detailed study on the effect of the optical carrier offset from the resonance wavelength and its effect on the suppression and the upconverted RF linewidth. Using the same platform, we also demonstrate RF-pulse generation using a PN Mach-Zehnder modulator. An RF modulated optical carrier, and an RF signal can be fed to the MZM to create pulsed RF of desired pulse width and rate. As a demonstrator, we show that RF-signal of frequency between L-X band could be fed and pulsed at various rates from 100-0.1 millisecond. The two examples demonstrate the feasibility of the Silicon Photonics Platform for building photonic assisted RF technology.
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Vadivukkarasi Jeyaselvan, Shankar Kumar Selvaraja, "Silicon-photonic-assisted on-chip RF signal processing", Proc. SPIE 10531, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XI, 105311W (23 February 2018); doi: 10.1117/12.2289713; https://doi.org/10.1117/12.2289713
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