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In pursuit of high transmission capacity, people have been tried many ways. Forexample, they pave more cables or use the TDM (time domain multiplexer) toimprove the transmission capacity. But in these traditional ways, signals couldbecome weaker in power through the fiber link. And the further they are transmitted,the weaker the signals will be until they can not be detected. With the advanced oftechnology, optical amplifier which is a better solution to improve the transmissioncapacity came around. It can strengthen the attenuated signals and even can bringthem back to the original level. And now it is mainly applied in DWDM technologyso that DWDM technology can support long-haul transmission.
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