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提出了一种新型移相光量化方案,利用光纤挤压器使光纤传输截面产生应力双折射,从而实现移相量化编码。在实验中实现了4 bit移相光量化器,用10 GHz重复频率采样脉冲对2.5 GHz正弦信号进行量化,获得量化结果的信噪比为23.9 dB,对应的有效比特位为3.68 bit。同已有的方案相比,此方案结构简单,只需要一个相位调制器,避免了多调制器工作输入信号的同步问题;利用光纤挤压器实现移相,控制精度高且成本低,可以实现高于6 bit的理论量化精度;并且可以通过光脉冲复用技术实现更高的采样速率。
A new scheme of phase-shifting light quantization is proposed. The fiber biaxial cross-section of the optical fiber is biaxially-refracted by the optical fiber extruder so as to realize the phase-shift quantization coding. In the experiments, a 4 bit phase-shifted optical quantizer was implemented. The 2.5 GHz sinusoidal signal was sampled with a 10 GHz repetition rate sampling pulse. The SNR of the quantized result was 23.9 dB and the corresponding effective bit was 3.68 bit. Compared with the existing schemes, this scheme has a simple structure and only needs one phase modulator, which avoids the synchronization problem of multimodulator working input signals; the phase shift is realized by the optical fiber presser; the control precision is high and the cost is low; Higher than 6 bit theoretical quantization accuracy; and can achieve higher sampling rate through optical pulse multiplexing.