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为了将声光移频器(AOFS)应用至光锁相环路中实现锁相环路快速精密调谐,并保证相干接收机接收信号的质量,介绍了AOFS的移频原理以及在锁相环路中的动态工作模式,对AOFS的插入损耗特性进行了系统的研究,着重分析了AOFS驱动器功率变化以及移频过程中频率变化对插入损耗的影响。设计并搭建了基于光拍频方法的1550nm AOFS插入损耗测量实验系统,测试得出AOFS在各种外界调制信号影响下插入损耗的变化规律,分析了多种影响因素共同作用下插入损耗的整体动态变化趋势并进行实验验证。根据实验分析结果对AOFS驱动功率进行优化,结果表明,将驱动器功率设置为1 W,相比于25mW驱动功率,AOFS插入损耗值在移频范围内整体下降15dB,最大相对插入损耗值下降1dB。
In order to apply the acousto-optical frequency shifter (AOFS) to an optical phase-locked loop (PLL) to achieve fast and fine-tuning of the PLL, and to ensure the quality of the received signal of the coherent receiver, the AOFS frequency-shifting principle and the phase-locked loop In the dynamic mode of operation, AOFS insertion loss characteristics of a systematic study focused on the AOFS drive power changes and the frequency shift during the frequency shift on the insertion loss. A 1550nm AOFS insertion loss measurement experiment system based on optical beat-frequency method was designed and built. The variation of insertion loss of AOFS under the influence of various external modulation signals was tested. The overall dynamics of insertion loss under various influence factors were analyzed. Changes and experimental verification. The AOFS driving power is optimized based on the experimental results. The results show that the AOFS insertion loss is 15dB lower than the 25mW driving power and the maximum relative insertion loss is 1dB lower than the driving power of 25mW.