Photonic analog-to-digital converter using Mach-Zehnder modulators having identical half-wave voltages with improved bit resolution.
Photonic analog-to-digital converter using Mach-Zehnder modulators having identical half-wave voltages with improved bit resolution.
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DOI：
10.1364/ao.48.004458
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发表时间：
2009-08
期刊：
影响因子：
1.9
通讯作者：
Shuna Yang;Chao Wang;H. Chi;Xianmin Zhang;Shilie Zheng;Xiaofeng Jin;J. Yao
中科院分区：
文献类型：
--
作者：
Shuna Yang;Chao Wang;H. Chi;Xianmin Zhang;Shilie Zheng;Xiaofeng Jin;J. Yao
提出并研究了一种提高比特分辨率实现光子模数转换的新方法。该方法不使用具有几何比例半波电压的Mach-Zehnder调制器(MZM)，而是具有相同的半波电压，从而大大简化了实现。为了在不增加MZM数量的情况下提高位分辨率，每个MZM连接具有多个阈值的多个比较器。基于对称数制(SNS)技术进行量化和编码。提出并证明了基于SNS的三种新的量化和编码方案。研究了基于上述方案的4位光子模数转换电路。对于给定的方案，需要两个MZM，比较器的数目分别为14、16和9。进行了数值模拟和实验。验证了所提方案的有效性。
A novel approach to perform photonic analog-to-digital conversion with improved bit resolution is proposed and investigated. Instead of using Mach-Zehnder modulators (MZMs) with geometrically-scaled half-wave voltages, the MZMs in the approach have identical half-wave voltages, which greatly simplifies the implementation. To improve the bit resolution without increasing the number of MZMs, each MZM is connected with multiple comparators having multiple thresholds. The quantization and encoding are performed based on the symmetrical number system (SNS) technique. Three new quantization and encoding schemes based on the SNS are proposed and demonstrated. A 4 bit photonic analog-to-digital conversion based on the given schemes is investigated. For the given schemes, two MZMs are needed with the numbers of comparators being 14, 16, and 9, respectively. Numerical simulations and experiments are performed. The effectiveness of the proposed schemes is verified.