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日本住友电气工业公司在Kohchi有线广播网中首次把光纤放大技术应用于电缆电视网。该试验是在Kohehi(始端)和Azono(相距6.7km)之间的一根单模光纤上进行的。在现场试验中,取消了损耗一般较大的调幅、残余边带光传输,这样可对34个频道的传输进行多路复用,以供8个用户共享。掺铒光纤放大器既可以串在线路上又可以用在局内,可在1550nm波长提供27dB的信号增益。射频视频信号由24路调幅残余边带(AM-VSB)视频信号和10路未调制
Sumitomo Electric Industries Co., Ltd. for the first time in Kohchi cable radio network optical fiber amplifier technology applied to the cable television network. The test was conducted on a single-mode fiber between Kohehi (beginning) and Azono (6.7km apart). In the field test, cancel the loss of the larger amplitude modulation, residual side light transmission, so that the transmission of 34 channels can be multiplexed for 8 users to share. Erbium-doped fiber amplifiers can be used either in-line or in-line, providing 27 dB of signal gain at 1550 nm. The RF video signal consists of 24 AM-VSB video signals and 10 unmodulated