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Multi-channel control for microring weight banks

Author(s): Tait, AN; De Lima, TF; Nahmias, MA; Shastri, BJ; Prucnal, Paul R

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Abstract: We demonstrate 4-channel, 2GHz weighted addition in a silicon microring filter bank. Accurate analog weight control becomes more difficult with increasing number of channels, N, as feedback approaches become impractical and brute force feedforward approaches take O(2N) calibration measurements in the presence of inter-channel dependence. We introduce model-based calibration techniques for thermal cross-talk and cross-gain saturation, which result in a scalable O(N) calibration routine and 3.8 bit feedforward weight accuracy on every channel. Practical calibration routines are indispensible for controlling large-scale microring systems. The effect of thermal model complexity on accuracy is discussed. Weighted addition based on silicon microrings can apply the strengths of photonic manufacturing, wideband information processing, and multiwavelength networks towards new paradigms of ultrafast analog distributed processing.
Publication Date: 14-Apr-2016
Electronic Publication Date: 14-Apr-2016
Citation: Tait, AN, De Lima, TF, Nahmias, MA, Shastri, BJ, Prucnal, PR. (2016). Multi-channel control for microring weight banks. Optics Express, 24 (10.1364/OE.24.008895
DOI: doi:10.1364/OE.24.008895
Type of Material: Journal Article
Journal/Proceeding Title: Optics Express
Version: Final published version. This is an open access article.

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