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. 2022 Apr 12;15(1):9. doi: 10.1007/s12200-022-00012-9

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© The Author(s) 2022

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Fig. 23 — a 1 × 16 splitter tree circuit consisting of 15 tunable couplers, each of which is a balanced MZI with a TOPS in one arm. b Electrical connectivity of the 15 phase shifters. They contain a diode in series and are connected to three control lines and five driver channels [62]