| 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: | 4 (Dimensions.ai - last update: 24/11/2024)
1 (OpenCitations - last update: 1/7/2024)
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Abstract
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. Related Research Topics
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