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在建的上海65 m射电望远镜计划进行L到Q等8个波段的观测,其中K波段(18～26.5GHz)观测带宽达8.5 GHz,为了实现宽带微波信号从天线接收机到终端控制室近500 m距离的高质量传输,采用1～12 GHz的宽带微波信号光纤传输链路。在介绍光纤传输链路的构成和总体性能参数的基础上,重点讨论了光纤的衰减和色散特性,阐述了宽带微波信号光纤传输链路的设计方案,并与电缆传输链路的性能进行了比较,证明了光纤传输链路的优势和方案的可行性。
The Shanghai 65 m radio telescope under construction plans to carry out the observation of 8 bands from L to Q. The observation bandwidth of K band (18-26.5 GHz) is 8.5 GHz. In order to realize the broadband microwave signal from the antenna receiver to the terminal control room nearly 500 m distance high-quality transmission, using 1 ~ 12 GHz broadband microwave signal optical fiber transmission link. On the basis of introducing the composition and overall performance parameters of optical fiber transmission links, the attenuation and dispersion characteristics of optical fibers are mainly discussed. The design scheme of optical fiber transmission links for broadband microwave signals is described and compared with the performance of cable transmission links , Proved the advantages of optical fiber transmission link and the feasibility of the scheme.