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. 2018 Jun 8;4(6):eaar6782. doi: 10.1126/sciadv.aar6782

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Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — LD, laser diode; PC, polarization controller; MZM, Mach-Zehnder modulator, SMF, single-mode fiber; PBS, polarization beam splitter; Σ, microwave combiner; EA, electrical amplifier; ESA, electrical spectrum analyzer.