IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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FPGA-based phase-compensation of two independent lasers in a field experiment of quantum repeater
Jinwei JiangBowei WangWenchao JiTianhong FuJiarong YanYe HongDandan QinYi HuXiao Jiang
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2024 年 21 巻 19 号 p. 20240463

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A phase-locking system is designed and developed to measure and compensate for the phase fluctuations in real time at an intermediate node. The performance of the compensated feedback loop is theoretically analyzed and simulated. Radio frequency generators and mixer emulate the lasers and interference plus photon counting processes to perform closed-loop verification without lasers. When the sum of the linewidths of the two emulated lasers is 1.175kHz, the interference root-mean-square phase noise is suppressed from 1626° to 30°. A closed-loop phase noise of approximately 13° is expected for field experiments with the same laser linewidth and 8µs loop delay.

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© 2024 by The Institute of Electronics, Information and Communication Engineers
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