High power lasers (> +21dBm) have gradually become the common solution for signal transmitting systems including regional cable television, Fiber To The Home (FTTH), and gigabit passive optical networks (G- PONs) d...High power lasers (> +21dBm) have gradually become the common solution for signal transmitting systems including regional cable television, Fiber To The Home (FTTH), and gigabit passive optical networks (G- PONs) due to their ability to generate signals that can be transmitted over long distances. However, if protective design is not implemented in the facility at the client side, users may be exposed to health hazards such as eye damage from these high-power lasers. High-power optical adapters with laser shutter use metal masks to prevent eye exposure to direct laser beams. They have progressively replaced conventional optical adapters and entered the market mainstream. Our study uses the Elastic-Plastic theory together with parametric design to investigate the effect of geometry on the initial spring-back angle of a laser shutter. Once the force stabilizes, the angles of the initial spring back are found to be the same as the simulated results for several attempts. In our study, it is observed that factors including the thickness of the metal masking plate, the initial design angle, the stiffness of the material and the boundary conditions have significant influence on the spring back angle. These can be used as references in design control.展开更多
基于光闸的单向传输系统是主要承担不同密级系统的数据传输工作。与传统基于网闸非等密级系统数据传输不同:基于光闸的单向传输系统安全性由光单向传输特性保证;由于数据的单向传输,无法通过反馈确定机制保证数据传输的可靠性。为此提...基于光闸的单向传输系统是主要承担不同密级系统的数据传输工作。与传统基于网闸非等密级系统数据传输不同:基于光闸的单向传输系统安全性由光单向传输特性保证;由于数据的单向传输,无法通过反馈确定机制保证数据传输的可靠性。为此提出了一种高可靠的无连接网络层输出协议——光闸数据包协议(Optical Shutter Data Protocol,OSDP),该协议采用CRC检验以提高校验错能力,协议可选项——报文摘要,用于纠错功能,在双机冗余备份系统情况下,可大幅提高数据传输的可靠性。以峰值流量800Mb/s估算,该系统理论上平均无故障时间为111.57天,试验表明该协议在基于无反馈的光闸单向传输系统中能有效保证数据传输的可靠性。展开更多
主动快门式3D技术的关键在于左右眼帧序的同步,尤其在无线及多人观看的条件下,帧序同步仍存在着很多问题。提出了一种在DLP Link 3D投影显示平台上利用红外光通信实现统一帧序同步的解决方案,旨在进一步提高DLP Link主动快门3D技术的易...主动快门式3D技术的关键在于左右眼帧序的同步,尤其在无线及多人观看的条件下,帧序同步仍存在着很多问题。提出了一种在DLP Link 3D投影显示平台上利用红外光通信实现统一帧序同步的解决方案,旨在进一步提高DLP Link主动快门3D技术的易用性和灵活性。展开更多
针对光学相机通信(Optical Camera Communication,OCC)链路收发两端不同步和相机帧间间隔等因素引起OCC链路数据丢失的问题,本文在分析相机接收机卷帘快门工作机制的基础上,研究了光电二极管(Light Emitting Diode,LED)-相机OCC链路的...针对光学相机通信(Optical Camera Communication,OCC)链路收发两端不同步和相机帧间间隔等因素引起OCC链路数据丢失的问题,本文在分析相机接收机卷帘快门工作机制的基础上,研究了光电二极管(Light Emitting Diode,LED)-相机OCC链路的基本工作原理,以及相机像素行数、像素行读取时间、拍摄帧速率、拍摄角度姿态等因素对OCC链路数据传输速率、链路丢帧率等参数的影响,并针对OCC链路的特点,设计了一种新型的适用于OCC链路的数据帧结构.通过对比分析发现,使用该数据帧的OCC链路,可以有效地解决收发端不同步和相机帧间间隔引起的OCC链路数据丢失的问题,优于常用的交错Hamming码和Raptor码帧结构.最后,本文设计搭建了相关的OCC链路测试平台,通过对比数字仿真结果和实际测量结果,验证了理论分析的有效性.展开更多
文摘High power lasers (> +21dBm) have gradually become the common solution for signal transmitting systems including regional cable television, Fiber To The Home (FTTH), and gigabit passive optical networks (G- PONs) due to their ability to generate signals that can be transmitted over long distances. However, if protective design is not implemented in the facility at the client side, users may be exposed to health hazards such as eye damage from these high-power lasers. High-power optical adapters with laser shutter use metal masks to prevent eye exposure to direct laser beams. They have progressively replaced conventional optical adapters and entered the market mainstream. Our study uses the Elastic-Plastic theory together with parametric design to investigate the effect of geometry on the initial spring-back angle of a laser shutter. Once the force stabilizes, the angles of the initial spring back are found to be the same as the simulated results for several attempts. In our study, it is observed that factors including the thickness of the metal masking plate, the initial design angle, the stiffness of the material and the boundary conditions have significant influence on the spring back angle. These can be used as references in design control.
文摘基于光闸的单向传输系统是主要承担不同密级系统的数据传输工作。与传统基于网闸非等密级系统数据传输不同:基于光闸的单向传输系统安全性由光单向传输特性保证;由于数据的单向传输,无法通过反馈确定机制保证数据传输的可靠性。为此提出了一种高可靠的无连接网络层输出协议——光闸数据包协议(Optical Shutter Data Protocol,OSDP),该协议采用CRC检验以提高校验错能力,协议可选项——报文摘要,用于纠错功能,在双机冗余备份系统情况下,可大幅提高数据传输的可靠性。以峰值流量800Mb/s估算,该系统理论上平均无故障时间为111.57天,试验表明该协议在基于无反馈的光闸单向传输系统中能有效保证数据传输的可靠性。
文摘针对光学相机通信(Optical Camera Communication,OCC)链路收发两端不同步和相机帧间间隔等因素引起OCC链路数据丢失的问题,本文在分析相机接收机卷帘快门工作机制的基础上,研究了光电二极管(Light Emitting Diode,LED)-相机OCC链路的基本工作原理,以及相机像素行数、像素行读取时间、拍摄帧速率、拍摄角度姿态等因素对OCC链路数据传输速率、链路丢帧率等参数的影响,并针对OCC链路的特点,设计了一种新型的适用于OCC链路的数据帧结构.通过对比分析发现,使用该数据帧的OCC链路,可以有效地解决收发端不同步和相机帧间间隔引起的OCC链路数据丢失的问题,优于常用的交错Hamming码和Raptor码帧结构.最后,本文设计搭建了相关的OCC链路测试平台,通过对比数字仿真结果和实际测量结果,验证了理论分析的有效性.
