摘要
本文介绍副载波复用(SCM)卫星电视光网络的组成,并对C波段10个FM-TV副载波复用系统进行设计、分析。设计中采用我国卫星电视接收标准。光源是DFB-LD,用单模光纤传输,PIN-PD作光检测器。通过光星型耦合器把卫星电视信号同时传送到16个终端。在光发送机中采用过调制技术来提高激光器的输出光功率;并根据系统的实际情况,提出用互阻抗低噪声放大器来降低光接收机的噪声,从而使传输距离达到30km。
This paper describes the composition of satellite vedio transmission using subcarrier multiplexed lighwave network and presents the design and analysis for a 10-channel FM- TV subcarrier multiplexed System. A DFB-LD is used as light source,the optical signal is transmitted through a single mode fiber and a PIN photodiode is employed as photo-detector. The Satellite vedio signal can be distributed simultaneously over optical fiber to 16 terminals using star type optical coupler. Overmodulation may be employed in the optical transmitter to increase the output power of laser diode. It is suggested that the low noise transimpedance amplifier be used according to the actual conditions of the system to decrease the noise of the optical receiver, thus lengthening the transmitting distance to 30km
出处
《铁道学报》
EI
CAS
CSCD
北大核心
1993年第3期48-54,共7页
Journal of the China Railway Society
关键词
副载波复用
光网络
载波噪声比
subcarrier multiplexing, lightwave network,carrier to noise ratio