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提出了一种采用并行光强度调制器实现移相光量化的方法。利用对光强度的衰减实现量化曲线的相移,解决了现有移相光量化方案中相位调制器对环境、温度较为敏感,量化曲线相移控制精度以及脉冲走离的问题。采用两个铌酸锂强度调制器并行连接,每个光耦合器分成4个通道,每个通道中插入光衰减器,通过调节光衰减器实现通道间调制曲线的相移,构成8通道4 bits的光量化器。实验中对10 GHz的正弦信号进行了光量化测试,量化结果的有效比特数(ENOB)为3.7 bits,仅低于理想分辨率0.3 bits。实验结果表明该方案可行,与一般移相光量化方案相比,具有较高的有效比特数。
A method of parallel light intensity modulation using parallel light intensity modulator is proposed. The phase shift of the quantization curve is achieved by decaying the light intensity so as to solve the problem that the phase modulator is sensitive to the environment and the temperature in the phase shifting light quantization scheme and the precision of the phase shift control of the quantization curve and the pulse going away. Two lithium niobate intensity modulators are connected in parallel. Each optical coupler is divided into four channels, and an optical attenuator is inserted into each channel. The phase shift of the modulation curve between channels is adjusted by adjusting the optical attenuator to form 8 channels of 4 bits Light quantizer. In the experiment, a 10 GHz sinusoidal signal was light-quantized. The effective number of bits (ENOB) of the quantization result was 3.7 bits, which was only lower than the ideal resolution of 0.3 bits. Experimental results show that this scheme is feasible and has a higher effective number of bits compared with the general phase-shifted optical quantization scheme.