Photonic analog-to-digital converter based on the robust symmetrical number system
Photonic analog-to-digital converter based on the robust symmetrical number system
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DOI：
10.1016/j.optcom.2012.07.076
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发表时间：
2012-11
影响因子：
2.4
通讯作者：
Ying Chen;H. Chi;Shilie Zheng;Xiaofeng Jin;Xianmin Zhang
中科院分区：
文献类型：
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作者：
Ying Chen;H. Chi;Shilie Zheng;Xiaofeng Jin;Xianmin Zhang
提出并论证了一种实现具有类格雷码特性的光子模数转换的新方法。该方法利用具有相同半波电压的马赫-曾德尔调制器阵列来实现量化和编码，而不是使用具有不同半波电压的马赫-曾德尔调制器（MZM），大大简化了实现过程。在每个MZM的输出端应用具有预设阈值的多个比较器，以提高位数。通过合理设置MZM的偏置电压，实现了一种基于鲁棒对称数字系统（RSNS）编码方法的光子模数转换器（ADC）。作为一个例子，一个3通道结构的最大量化水平为17（对应于4.09位）进行了详细研究。我们表明，差分编码技术可以应用在所提出的结构，这增加了ADC系统的等效位数。
A novel approach to realizing photonic analog-to-digital conversion with Gray-code-like property is proposed and demonstrated. Instead of using Mach–Zehnder modulators (MZMs) with different half-wave voltages, an array of MZMs with identical half-wave voltages are applied to realize quantization and encoding, which greatly simplifies the implementation. Multiple comparators with preset thresholds are applied at the output of each MZM to improve the number of bits. Through properly setting the bias voltages of the MZMs, a photonic analog to digital converter (ADC) based on the robust symmetrical number system (RSNS) coding method is realized. As an example, a 3-channel structure with maximum quantization level of 17 (corresponding to 4.09 bits) is investigated in detail. We show that the differential encoding technique can be applied in the proposed structure, which increases the equivalent number of bits of the ADC system.