论文部分内容阅读
一种用于HBTV电视分量信号光纤传输的新的脉冲模拟技术一脉冲频率宽度调制(PFWM)技术已开发。采用这种技术,HDTV电视的三个分量信号可以复合组合成一列脉冲信号。该脉冲信号的频率随亮度信号的幅度成正比变化,而脉冲宽度随两个色度信号的幅度成正比变化。这样就可以实现体积小、价格低的HDTV电视传输系统。本文介绍了PFWM光纤传输系统的基本工作原理及其实验结果。实验结果表明,采用单模光纤,该系统传输的HDTV电视分量信号和二路脉冲编码调制(PCM)音频信号超过了20公里。在该系统中,采用了一个1.3μm激光二极管(LD)和一个锗雪崩光电二极管(Ge-APD)分别用作电-光转换和光-电转换。
A New Pulse Simulation Technique for Optical Fiber Transmission of HBTV Television Component Signal A pulse frequency width modulation (PFWM) technique has been developed. Using this technique, the three component HDTV signals can be combined into a single pulse signal. The frequency of the pulse signal varies in proportion to the amplitude of the luminance signal, and the pulse width varies in proportion to the amplitude of the two chrominance signals. This makes it possible to achieve a small, low-cost HDTV television transmission system. This paper describes the PFWM optical transmission system, the basic working principle and experimental results. Experimental results show that using single-mode fiber, the system transmits HDTV television component signals and two-way pulse code modulation (PCM) audio signals over 20 km. In this system, a 1.3μm laser diode (LD) and a germanium avalanche photodiode (Ge-APD) are used for the electro-optical conversion and the photo-electric conversion, respectively.