超高空间分辨率光反射仪关键技术进展

作为分布式光纤传感器核心技术,光反射仪能够对光纤进行非破坏性检测,获取沿光纤长度的反射率、折射率和偏振态等分布信息来判断光纤链路各类异常"事件"。在一些高端监测领域,例如光纤到户(fiber-to-the-home,FTTH)接入网的故障诊断、大型发电机组和大型变压器内部的热点和形变监测以及大飞机的机翼结构安全监测等应用,对传感器空间分辨率、测量距离等性能提出了非常高的要求。本文总结了光反射仪技术国内外的研究现状,并针对应用需求,回顾了几种实现长距离高空间分辨率光反射仪的关键技术及其在实现更高性能时所面临的技术难点。针对各类技术难点,分别提出三种创新性方案,从三种不同角度加以改善,推动光反射仪技术在分布式传感系统中的应用。

Adaptive and Intelligent Digital Signal Processing for Improved Optical Interconnection

In recent years, explosively increasing data traffic has been boosting the con?tinuous demand of high speed optical interconnection inside or among data centers, high performance computers and even consumer electronics. To pursue the improved intercon?nection performance of capacity, energy efficiency and simplicity, effective approaches are demonstrated including particularly advanced digital signal processing (DSP) meth?ods. In this paper, we present a review about the enabling adaptive DSP methods for opti?cal interconnection applications, and a detailed summary of our recent and ongoing works in this field. In brief, our works focus on dealing with the specific issues for short-reach interconnection scenarios with adaptive operation, including signal-to-noise-ratio (SNR) limitation, level nonlinearity distortion, energy efficiency consideration and the de?cision precision.

基于质子交换和刻蚀工艺的体铌酸锂阵列波导光栅

提出一种将质子交换技术和刻蚀技术结合的体铌酸锂波导和器件加工方案,基于质子交换的铌酸锂晶体相变特性改变,降低了质子交换区直接刻蚀难度,结合质子交换的纵向折射率改变和刻蚀波导的横向结构改变,波导尺寸显著降低,采用粒子群算法优化波导尺寸,最小可达2.5μm。基于该工艺方案设计了中心波长为1550 nm、四通道且通道间隔为400 GHz的阵列波导光栅,该阵列波导光栅的传输损耗约为6 dB,相邻通道间串扰均低于22 dB,整体尺寸仅为850μm×620μm,在高密度铌酸锂光子集成互连等场景具有较大的应用潜力。