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由于历史原因,在原扬州市至邗江区各乡镇的有线电视网络中,北部乡镇采用1550nm光信号联网,杭集、太安两乡镇采用一级1310nm光信号联网,沿江片、洲片各乡镇采用二级DFB1310nm光信号联网。由于乡镇站本身采用的是一级光链路,沿江片、洲片各乡镇采用三级光链路传输,因此信号指标略低。随着邗江区乡镇的合并,该区乡镇广电站减少到14个,为取消乡镇联网中的DFB1310nm中断站、解决停电及指标问题提供了条件。这次改造,除杭集、太安两乡镇外,其余12个乡镇全部采用1550nm光传输平台实现联网。本文结合这次联网信号的调整,就两种光调制方式的应用谈点粗浅体会。
For historical reasons, in the original cable TV network of towns and villages in Yangzhou to Qijiang District, the northern townships adopted the 1550nm optical signal networking. The first and second townships in Hangzhou and Tai’an adopted a 1310nm optical signal networking. Grade DFB1310nm optical signal networking. Due to the township station itself is the use of an optical link, along the Yangtze River, Chau various towns using three optical link transmission, the signal index is slightly lower. With the merger of towns and townships in Qijiang District, the number of township radio and TV stations in the district has been reduced to 14, which provides the conditions for the cancellation of the DFB1310nm interruption station in township and town networks and the solution of power outages and indicators. The transformation, in addition to Hang set, too two townships, the remaining 12 townships all use 1550nm optical transmission platform for networking. This article combined with the networking of the signal adjustment, on the two light modulation applications talk about the superficial experience.