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本文对使用一个光功率组合器和强度调制的多个光源的电视信号频分多路光传输的最大容许传输损耗进行了理论分析,把假设用 PIN 光电二极管检测器,并且使用光功率组合器与多个光源的结构的性能跟一个电子学功率组合器和单一光源的性能作了比较。分析结果表明,如果调制系数为0.8,每个光源供给功率组合器的功率为3mW 的话,那么10个电视频道的最大容许传输损耗大于25dB。因此,如果使用损耗5dB/km 的光缆,载有10路电视跨越5km 距离的实用光纤传输系统看来在不久的将来是可能的。
In this paper, the theoretical analysis of the maximum allowable transmission loss of TV signal frequency-division multiplexed optical transmission using an optical power combiner and intensity-modulated multiple light sources is carried out. The assumption is that the PIN photodiode detector and the optical power combiner are used The performance of multiple light sources is compared to the performance of an electronic power combiner and a single light source. The analysis results show that the maximum allowable transmission loss of the 10 television channels is more than 25 dB if the modulation factor is 0.8 and the power supplied by each light source to the power combiner is 3 mW. Therefore, if optical fiber cables with a loss of 5 dB / km are used, a practical fiber optic transmission system carrying 10 channels of television across a 5 km distance appears likely in the near future.