摘要
文中讨论了卫星间和星地间激光通信技术方案的若干问题。从背景噪声、体积、质量、器件性能和可行性角度 ,比较分析了激光波段的选择。 80 0和 1550nm波段的半导体激光器具有体积小、质量轻、效率高的优点。与可见波段相比 ,背景噪声低。提出了一个利用光纤通信技术和器件总体方案的建议。采用由半导体激光器振荡器和EDFA光放大器构成的MOPA结构作为通信发射机的光源 ;采用光纤环行器和光纤耦合器实现发收光路的复用 ;采用窄线宽光纤光栅提高接收机的信噪比 ,与原子线滤波器相比具有波段选择范围宽等好处。
Some issues on technologies of laser communications between satellites and satellite\|ground are discussed. Emphasis is put on comparison of laser wavelengths, in views of background noise level, system size and weight, performances and availability of the devices. Semiconductor lasers at 800 and 1550nm band are good candidates with small size, low weight and high efficiency. Compared with light sources at visible band, they suffer less background noise. A brief scheme is presented by using optical fiber communication technology and devices. A scheme of transmitter is proposed, which consists of a semiconductor laser master oscillator and an EDFA optical power amplifier (MOPA). Fiber circulators and fiber couplers will be incorporated in the terminal to multiplex the transmission and receiving optical paths. Narrow line\|width fiber bragg grating filters can also be used in the system. Compared with the atomic line filter, much more bands can be chosen by using FBG.
出处
《红外与激光工程》
EI
CSCD
2000年第3期44-48,共5页
Infrared and Laser Engineering
关键词
激光技术
空间通信
光纤通信
激光通信
Laser technology\ \ Space communication\ \ Optical fiber communication
