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. 2018 Mar 6;12:132. doi: 10.3389/fnins.2018.00132

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Copyright © 2018 Liu, Lu, Iseri, Shi and Kuzum.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Coupling efficiency between fibers and (A) the TR2227 LED chip and (B) the DA2432 LED chip were calculated based on the data from Figure 9 and fiber dimensions. Higher efficiencies are observed at median flux ratings.