摘要
设计了无线激光通信音频传输实验系统.在发射端采用对90MHz载波信号调频方式调制放大信号后,再对半导体激光器进行强度调制;在接收端光信号由光电探测器转换为电信号,电信号经中频放大器、变频器和鉴频器解调出原始信号,原始信号再经功率放大器放大后由示波器接收.测量了实验系统音频传输的幅频特性、动态特性和延迟特性.实验结果表明:由于采用二次调制,系统抗干扰能力强,接收灵敏.
A wireless laser audio transmission system is designed. In the emission part, the 90 MHz carrier wave is modulated by frequency, then the intensity of the output light of a semiconductor laser is modulated. In the receiving part, optical signal is changed into electrical signal by optical-to-electrical transducer, then the electrical signal is demodulated to the original signal. The system＇s amplitude-frequency characteristics, dynamic characteristics and delay characteristics are measured. The experimental results indicate that the system can resist interference and receive very weak single signal using twice modulation method.
出处
《物理实验》
2008年第7期5-7,11,共4页
Physics Experimentation
关键词
无线激光通信
音频传输
调制
wireless laser eommunieation
audio transmission
modulation
