论文部分内容阅读
我所于去年八月下旬研制出的12路载波电话光纤传输系统,目的为克服电磁干扰和电磁脉冲干扰,传输距离约10公里左右。系统采用设备简单经济的模拟脉冲化异步脉位——强度调制PIM——IM(或称脉冲间隔调制)方式,通过一段时间的室内试验和数据测量表明,在话音信噪比大于40分贝以上时,话音的自然度、清晰度良好。为了增大传输距离,我们还加了一个2R中继器进行试验,试验是用两根光纤分A——B方向和B——A方向进行的,试验方框图如图1。
The 12-channel carrier phone optical fiber transmission system developed by me in late August last year was designed to overcome electromagnetic interference and electromagnetic pulse interference with a transmission distance of about 10 km. The system uses a simple and economical analog pulse asynchronous pulse - intensity modulation PIM - IM (pulse interval modulation) method, through a period of indoor experiments and data measurements show that when the signal to noise ratio is greater than 40 dB , The natural degree of voice, good clarity. In order to increase the transmission distance, we also added a 2R repeater to carry on the experiment, the experiment is to use two optical fibers to divide A - B direction and B - A direction to carry on, the test block diagram.