| 极微弱脉冲光强度稳定控制技术 |
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| 引用本文： | 胡敏,廖常俊,郭邦红,刘颂豪.极微弱脉冲光强度稳定控制技术[J].光学与光电技术,2007,5(4):54-57. |
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| 作者姓名： | 胡敏 廖常俊 郭邦红 刘颂豪 |
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| 作者单位： | 华南师范大学信息光电子科技学院光子信息技术广东省高校重点实验室,广州,510631 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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广州市科技改关项目 |
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| 摘 要： | 实际测量输出光强度随时间变化的随机过程是一个慢过程.将光衰减过程分为固定衰减和可变衰减两部分,设计制作了一种实时监控系统,通过调节自动反馈控制可变衰减器,使得末端固定衰减器的输出脉冲中,单光子脉冲出现的概率等于17.6%,多光子脉冲出现的概率低于2%,保持平均光子输出速率波动不大于0.1%,为量子密码术提供了稳定的准单光子源.
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| 关 键 词： | 单光子 量子密码 分束耦合器 电控可变光衰减器 单片机 |
| 文章编号： | 1672-3392（2007）04-0054-04 |
| 收稿时间： | 2006/10/25 |
| 修稿时间： | 2006-10-25 |
Steady Control Technology of Very Weak Pulse Light Intensity |
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| HU Min,LIAO Chang-jun,GUO Bang-hong,LIU Song-hao.Steady Control Technology of Very Weak Pulse Light Intensity[J].optics&optoelectronic technology,2007,5(4):54-57. |
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| Authors: | HU Min LIAO Chang-jun GUO Bang-hong LIU Song-hao |
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| Institution: | Lab of Photonic Information Technology, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China |
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| Abstract: | The stochastic process of the practical measurement output of light intensity changing with time is a slow process. A real-time monitoring system is designed by dividing the optical attenuation to fixed part and variable part. The probability of single-photon is 17.6%, the probability of multiphoton less than 2%, the fluctuation of the average photon number not more than 1 % by adjusting the automatic feedback variable optical attenuator. A stable quasi single photon source for quantum cryptography is presented. |
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| Keywords: | single photon quantum cryptography splitling coupler electrical variable optical attenuator single-chip micro- computer |
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