光开关切换延时线自动标定与控制系统  

Automatic calibration and control system of optical switching delay line

作　　者：陈逸飞 史上清 恽斌峰 CHEN Yifei;SHI Shangqing;YUN Binfeng(Advanced Photonics Center,School of Electronic Science and Engineering,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学电子科学与工程学院先进光子学中心,江苏南京210096

出　　处：《光学精密工程》2023年第15期2161-2170,共10页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.62171118)。

摘　　要：光开关切换延时线芯片中各光开关的驱动电压标定和控制需使用多通道光功率计、可编程多通道电压源阵列等分立仪器,存在成本高、扩展困难的问题。设计并制作了一套低成本、易扩展的光开关切换延时线自动标定与控制系统,其中多通道光功率计模块可探测-53~-7.7 dBm内的光功率,误差小于0.5 dB;多通道电压输出模块可高精度稳定输出0~10 V的直流电压,输出电压波动小于±0.5 mV;使用单片机控制各模块协同工作并连接上位机实现人机交互。使用本系统对5-bit光开关切换延时线进行了自动标定和控制,结果显示,在32级延时状态下,延时线芯片输出端的透射光谱在1560 nm波长附近的波动均小于1 dB,对应的延时步进为3.1109 ps/state。该结果与商用仪器标定电压下测得的3.0620 ps/state的延时步进高度吻合。本文设计制作的标定与控制系统精度高、成本低、扩展性强,具有很高的应用价值。Calibrating the driving voltage of each optical switch in optical switched delay line(OSDL)chips requires a multichannel optical power meter,a programmable multichannel voltage source,and other discrete instruments,which causes the problems of high cost and system complexity when the chip scale in⁃creases.In this paper,an automatic calibration and control system is proposed for OSDL chips,which in⁃cludes the functions of a multichannel optical power meter and a multichannel adjustable voltage source.The power detection range is from-53 to-7.7 dBm,with an error of<0.5 dB.The voltage output range is 0-10 V,and the fluctuations are within±0.5 mV.A microcontroller unit is used to control all parts of the system and communicate with the computer.When the driving voltages of a 5-bit OSDL chip are calibrated with the proposed system,the measured fluctuations of the transmission spectra of all 32 de⁃lay states are approximately 1 dB near 1560 nm,and the measured delay step is 3.1109 ps/state,which is consistent with the result of 3.0620 ps/state obtained via calibration using commercial instruments.The proposed system achieved the same calibration and control effect as the commercial instruments and has the advantages of low cost and easy scalability.It has good application prospects.

关 键 词：微波光子学 集成光学 光开关切换延时线 光开关 标定 自动化 

分 类 号：TN256[电子电信—物理电子学]