光锁相环路中声光移频器插入损耗特性研究及优化

发布时间：2018-05-21 06:00

本文选题：光通信 + 声光移频器　；参考：《激光与光电子学进展》2017年10期

【摘要】：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。
[Abstract]:In order to apply the acoustooptic frequency shifter (AOFS) to realize the fast and precise tuning of the phase-locked loop (PLL) and to ensure the quality of the received signal by the coherent receiver, the principle of AOFS frequency shift and the dynamic working mode in PLL are introduced. The insertion loss characteristics of AOFS are studied systematically. The power change of AOFS driver and the influence of frequency change on insertion loss during frequency shift are analyzed. An experimental system of 1550nm AOFS insertion loss measurement based on optical beat frequency method is designed and built. The variation rule of AOFS insertion loss under the influence of various external modulation signals is obtained by testing. The overall dynamic trend of insertion loss under the action of multiple factors is analyzed and verified by experiments. According to the experimental results, the driving power of AOFS is optimized. The results show that the maximum relative insertion loss is reduced by 1 dB compared with the insertion loss of 25mW driving power, which is 15 dB lower than that of 25mW driving power.
【作者单位】：长春理工大学空地激光通信技术国防重点学科实验室;上海交通大学区域光纤通信网与新型光通信系统国家重点实验室;
【基金】：国家自然科学基金(91438204)
【分类号】：TN929.1

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