改进了现有的基于强度调制型移相的微波光量化方案, 新方案简化了系统结构, 不再需要互补输出的强度调制器, 显著提高了工作带宽, 并进行了实验验证。新方案采用双路强度调制进行采样, 通过调节2个可调光衰减器, 对2路采样信号进行非相干叠加来实现系统中传输特性曲线的相移。实验演示了8通道(16个量化等级)的移相光量化系统, 用20 GHz重复频率的光脉冲对2.5 GHz的正弦信号进行量化, 从量化值可以得到较好的正弦拟合曲线, 证明了方案的可行性。

An improved scheme of intensity-modulating optical quantization technique for microwave signal is proposed and demonstrated by using double channel sampling. This scheme reduces the complexity and dramatically improves the operation bandwidth by eliminating the need of dual complementary-output intensity modulator. In an experimental demonstration, 8-channel outputs of optical quantization system for microwave signal are obtained with quantization levels of 16. A sinusoidal microwave signal of 2.5 GHz is quantized using pulse sequence with repetition rate of 20 GHz. Good fit sinusoidal curve can be obtained from the quantization values, which proves the feasibility of the proposed scheme.