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本文论述了310km广电干线模拟电视传输。该项目在黑龙江红兴隆农垦系统得以实现。项目实施历时1个月,创造了国际和国内广电1550nm干线模拟电视传输现场应用的三个纪录:最远的模拟电视干线传输全光链路:红兴隆到饶河310km传输,为目前国际和国内最远距离光链路传输记录,之后再经过三级1310nm光传输网,累积长度达380km;最大的模拟电视干线传输跨度:有二处单跨距最大,居国际和国内之冠,农垦总局到曙光农场87km,红旗岭农场到饶河90km,均无中继点,实施难度较大,通过EDFA直接大跨距传输87km和90km,并且链路末端增加了损耗较大的色散补偿模块(60km损耗6dB),结合入纤功率的控制和严格抓光链路施工质量克服困难,节省了一定的建网成本:最远的模拟电视干线传输Overlay应用:在172km处的853农场实现Overlay,1550nm直调光发射机传输叠加到干线光信号上(外调制光波长和直调光波长合波在一根光纤上传输)的传输距离达到50km,也是目前国际和国内应用Overlay的最远记录。通过直调1550nm光发射机波分复用叠加3套模拟节目(农场本地频道或大量窄播数据应用)进入干线光传输系统,解决了1550nm干线传输之后在本地接入的全光应用(干线传输信号不需要光电光二次转发)。
This article discusses the 310km radio and television trunk analog TV transmission. The project was implemented in Heilongjiang Hongxinglong Reclamation System. The project lasted for 1 month and created three records of international and domestic radio and television 1550nm trunk analog TV transmission applications: The farthest analog TV trunk transmission All-optical link: Hongxinglong to Raohe 310km transmission, for the current international and domestic The longest distance optical link transmission records, and then after three 1310nm optical transmission network, the cumulative length of up to 380km; the largest analog TV transmission line span: There are two single span maximum, ranking the highest in the country and the country, 87km of Dawn Farm and 90km of Hongqiling Farm to Raohe have no relaying point, which is difficult to implement. The transmission distance is 87km and 90km through EDFA direct large-span transmission, and the loss compensation module with larger loss (60km loss at the end of the link) 6dB), combined with the control of incoming fiber power and the strict construction of optical link construction to overcome difficulties and save some network construction costs: Farthest analog TV trunk transmission Overlay application: Overlay at 853 farms at 172km, 1550nm direct transfer The transmission distance of the optical transmitter to the trunk optical signal (the wavelength of the external modulated light and the wavelength of the direct modulated light is transmitted on an optical fiber) reaches a transmission distance of 50 km, which is also the most widely used in international and domestic applications Record. 3 sets of simulations (farms local channels or a large number of narrowcast data applications) are entered into the trunk optical transmission system by direct-wave 1550nm optical transmitter WDM to address all-optical applications locally accessed after the 1550nm trunk transmission (trunk transmission The signal does not need the photoelectricity two-way to transmit).