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马赫-曾德尔调制器的工作特性随温度变化等环境因素影响严重,因此需要设计专用的偏置电压控制电路。利用扰动输入和谐波探测相结合的偏置电压控制方案是一种比较好的解决方案,但传统的控制架构在面对大调制信号输入时,往往会出现锁定点严重漂移的现象。首先对谐波产生的机制的进行了理论建模,然后对传统的谐波检测架构进行了分析,发现大信号调制下的以往谐波分量计算公式以不再适用,必须加以改进,因此在改进谐波计算公式的基础上,提出了一种新的可用于大信号调制下的偏置点控制技术,并研制了相应的驱动电路,对电路的偏置点控制测试结果发现,提出的方案偏置点的控制精度在1°以内,可以很好地满足大调制信号输入的应用需求。
Mach-Zehnder modulator operating characteristics with temperature changes and other environmental factors, so the need to design a dedicated bias voltage control circuit. The bias voltage control scheme using disturbance input and harmonic detection is a better solution. However, the traditional control architecture tends to have a serious drift of the lock point in the face of large modulation signal input. First of all, the mechanism of harmonic generation is theoretically modeled, and then the traditional harmonic detection architecture is analyzed. It is found that the formula for calculating harmonic components under large signal modulation is no longer applicable and must be improved. Therefore, Based on the harmonic calculation formula, a new biased point control technology which can be used for large signal modulation is proposed and the corresponding driving circuit is developed. The bias point control test results of the circuit show that the proposed scheme The control accuracy of the set point is within 1 °, which can well meet the application requirements of the large modulation signal input.