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Photonic analog-to-digital conversion using the robust symmetrical number system
Photonic analog-to-digital conversion using the robust symmetrical number system
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机译：使用鲁棒对称数字系统进行光子模数转换
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摘要
Embodiments in accordance with the invention allow for direct digitization of wideband RF signals without the need for down conversion or the use of mixers. In one embodiment, a preprocessed input analog signal is applied to three wideband Mach-Zehnder interferometers (MZI), e.g., modulators, to amplitude modulate a continuous wave laser signal. A photodetector is used at the output of each interferometer to convert the amplitude modulated optical signal into an electrical signal. This is followed by an amplifier and a low-pass filter (LPF) to increase the signal level and to reduce the noise. A small mi comparator bank at the output of each LPF is clocked at the sampling frequency and encodes the electrical signal from each detector into a thermometer code that represents an integer value within the modulus. A field programmable gate array (FPGA) then combines the thermometer-code from each comparator bank in order to generate a more convenient 6-bit binary representation, i.e., a digital output.
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机译：根据本发明的实施例允许宽带RF信号的直接数字化，而无需下变频或使用混频器。在一个实施例中，将预处理的输入模拟信号施加到三个宽带马赫曾德尔干涉仪（MZI），例如调制器，以对连续波激光信号进行幅度调制。在每个干涉仪的输出处使用光电检测器，以将调幅后的光信号转换为电信号。其次是放大器和低通滤波器（LPF），以增加信号电平并降低噪声。每个LPF的输出端都有一个小的m i 比较器组，以采样频率提供时钟，并将来自每个检测器的电信号编码为温度计代码，该温度计代码表示模量内的整数值。然后，现场可编程门阵列（FPGA）组合来自每个比较器组的温度计代码，以生成更方便的6位二进制表示形式，即数字输出。
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