摘要
针对现有基于低压汞蒸气灯"日盲"紫外光通信系统通信速率低、驱动电压高、光源响应速度慢、电光转换效率低和功耗过高等问题,提出并设计了一套基于LED的"日盲"紫外光通信系统。该系统以深紫外LED作为光源,用光电倍增管探测微弱光信号,采用脉冲位置调制(PPM)技术和最大似然解调技术,并用现场可编程门阵列完成了调制解调部分的设计与仿真。实验表明,采用深紫外LED和PPM技术,可以大幅度提高系统的通信速率、电光转换效率,同时显著降低驱动电压和系统功耗。
Considering the shortcomings of low data rate,low response speed,high driving voltage,low electrical to optical efficiency and excessive power of the existing short range ultraviolet（UV） communication system based on low pressure mercury lamps,an improved short-range UV communication system based on deep UV LED is proposed.This system takes pulse position modulation（PPM） and adaptive maximum likelihood demodulation as the key technologies.Photomultiplier tube is used to detect the weak optical signal.The scheme is simulated and realized by field programmable gate array.The simulation and experiment results indicate that the data rate and electrical to optical efficiency of the proposed system are improved greatly,and system power and driving voltage are also decreased.
出处
《激光与光电子学进展》
CSCD
北大核心
2010年第4期19-24,共6页
Laser & Optoelectronics Progress
关键词
光通信
紫外光
深紫外LED
脉冲位置调制
optical communication
ultraviolet
deep ultraviolet LED
pulse position modulation
