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Authors: A. Pandey, K. Van Gasse, D. Van Thourhout
Title: Integrated photonics approach to radio frequency self interference cancellation
Format: International Journal
Publication date: 8/2022
Journal/Conference/Book: Optics Continuum
Editor/Publisher: Optica, 
Volume(Issue): 1(8) p.1668-1675
DOI: 10.1364/OPTCON.461004
Citations: 2 ( - last update: 12/5/2024)
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An integrated photonics based scheme for radio-frequency self-interference cancellation is proposed and demonstrated on silicon. It is achieved using a dual-parallel Mach-Zehnder modulator that eliminates the interference signal in the optical domain. The output of the modulator is a carrier suppressed double-sideband waveform that contains only the signal of interest. Finally, the signal of interest is recovered by combining the modulator output with a local optical carrier and detecting it at a high-speed photodetector. We present a detailed theoretical analysis and derive the optimal condition for self-interference cancellation for small modulation indices. The modulators were designed and fabricated on IMEC's Silicon-on-Insulator platform iSiPP50G. Using this technique, we experimentally obtain a cancellation depth of 30 dB and a signal to interference ratio of 25 dB for frequencies up to 16 GHz, limited only by the equipment used. This is the first demonstration of self-interference cancellation on a silicon photonics platform that further expands the functionalities offered by integrated microwave photonics.

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