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光纤的传输距离有两种情况。一种是两端站具有光电端机而中途不接入光或电中继器的单段线路;另一种是中途接入很多光中继器的极长线路。对于单段线路,如两端站不接入光放大器,则其距离约为100 km;但如果在发端接入一光功率放大器,而在接收端接入一光预放大器,则通信距离可超过200 km;如果在中途再接入一遥泵光放大器(即在中途仅接入
Optical fiber transmission distance in two cases. One is a single-segment line with both ends of the optical network and a half-way optical or electrical repeater; the other is a very long line with many optical repeaters in the middle. For a single line, if the two end stations are not connected to the optical amplifier, the distance is about 100 km. However, if an optical power amplifier is connected to the transmitting end and an optical pre-amplifier is connected to the receiving end, the communication distance may exceed 200 km; If you are in the process of re-access a remote pump optical amplifier (that is only access in the middle