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Authors: A. Ribeiro, S. Declercq, U. Khan, M. Wang, L. Van Iseghem, W. Bogaerts
Title: Column-row addressing of thermo-optic phase shifters for controlling large silicon photonic circuits
Format: International Journal
Publication date: 2/2020
Journal/Conference/Book: IEEE Journal on Selected Topics in Quantum Electronics
Volume(Issue): 26(5) p.6100708 (8 pages)
DOI: 10.1109/JSTQE.2020.2975669
Citations: 21 ( - last update: 9/6/2024)
1 (OpenCitations - last update: 19/4/2024)
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We demonstrate a time-multiplexed row-column addressing scheme to drive thermo-optic phase shifters in a silicon photonic circuit. By integrating a diode in series with the heater, we can connect N x M heaters in an matrix topology to N row and M column lines. The heaters are digitally driven with pulse-width modulation, and time-multiplexed over different channels. This makes it possible to drive the circuit without digital-to-analog converters, and using only M+N wires. We demonstrate this concept with a 1 x 16 power splitter tree with 15 thermo-optic phase shifters that are controlled in a 3 x 5 matrix, connected through 8 bond pads.
This technique is especially useful in silicon photonic circuits with many tuners but limited space for electrical connections.

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