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平衡探测器的两输入通路在增益和时延上的不对称会对基于平衡探测的光模数转换(PADC)系统的性能产生影响。建立了基于平衡探测的PADC系统的数学模型,理论上分析了系统有效比特位(ENOB)与平衡探测器两输入通路的增益和时延的不对称性,并仿真分析了增益和时延的不对称对系统ENOB的影响,同时进行了相应的实验验证。结果表明,在相同调制深度下,系统的ENOB随着两输入通路的相对增益和相对时延的增加而减小。当平衡探测器两输入通路在增益和时延上完全一致时,系统的ENOB随着调制深度的增加而逐渐减小;当平衡探测器两输入通路在增益和时延上存在偏差时,系统的ENOB随着调制深度的增加先增大后减小。
The unbalanced gain and delay of the two input paths of the balanced detector can affect the performance of the optical-analog-to-digital conversion (PADC) system based on balanced detection. The mathematical model of PADC system based on balanced detection is established. The gain and delay asymmetry of two input paths of system effective bit (ENOB) and balanced detector are theoretically analyzed. The gain and delay Symmetry on the system ENOB, at the same time the corresponding experimental verification. The results show that at the same modulation depth, the system ENOB decreases with the relative gain and the relative delay of the two input paths. When the balanced detector’s two input paths are exactly the same in gain and delay, the system ENOB gradually decreases with the increase of modulation depth. When the balance detector’s two input paths deviate in gain and delay, ENOB first increases and then decreases with the increase of modulation depth.