| 基于锁模脉冲源和高速光开关的时分抽样模数转换 |
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| 引用本文： | 窦玉杰,张洪明,傅鑫,姚敏玉.基于锁模脉冲源和高速光开关的时分抽样模数转换[J].中国激光,2011(1). |
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| 作者姓名： | 窦玉杰 张洪明 傅鑫 姚敏玉 |
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| 作者单位： | 清华大学电子工程系清华大学信息科学与技术国家实验室集成光电子学国家重点实验室; |
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| 基金项目： | 国家863计划(2009AA01Z219); 国家自然科学基金(60977003)资助课题 |
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| 摘 要： | 提出了一种基于锁模脉冲源和高速光开关的时分抽样模数(A/D)转换系统。使用高重复频率、窄脉宽的锁模脉冲串对射频信号进行抽样,利用高速光开关进行时分复用,将高采样率的信号转换为并行的多路低采样率信号,以适应现有的电模数转换器进行量化和编码,并且通过改变光开关的频率,可以灵活地改变解复用后每路信号的频率。系统的优点在于可扩展性高,只需一个锁模脉冲源。使用10 GHz重复频率的锁模脉冲和1.25 GHz的高速光开关验证了系统方案的可行性。利用实验中得到的采样点可以较好地恢复出时域信号,并且得到了各个频率的频谱图。其信噪比可达32.02 dB,等效于5.03 bit的有效比特数。
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| 关 键 词： | 信号处理 光模数转换 时分抽样 锁模脉冲 时分复用 |
Optical Analog-to-Digital Conversion by Time-Interweaved Sampling Based on Mode-Locked-Pulse and High-Speed Optical Switch |
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| Dou Yujie Zhang Hongming Fu Xin Yao Minyu.Optical Analog-to-Digital Conversion by Time-Interweaved Sampling Based on Mode-Locked-Pulse and High-Speed Optical Switch[J].Chinese Journal of Lasers,2011(1). |
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| Authors: | Dou Yujie Zhang Hongming Fu Xin Yao Minyu |
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| Affiliation: | Dou Yujie Zhang Hongming Fu Xin Yao Minyu(State Key Laboratory on Integrated Optoelectronics,Tsinghua National Laboratory for Information Science and Technology,Department of Electronic Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | A time-interweaved sampling scheme for analog-to-digital(A/D) conversion based on mode-locked-pulse and high-speed optical switch is proposed.The radio frequency(RF) signal is sampled by high repetition rate ultra-short mode-locked pulse,and then demuxed by high-speed optical switch,which can convert the high frequency sampled signal to multi-channel lower frequency signal.So we can use electronic A/D conversion to quantize and code.The frequency of signal demuxed by optical switch can change easily if the ... |
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| Keywords: | signal processing optical analog-to-digital conversion time-interweaved sampling mode-locked pulse optical time division multiplexing |
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