Because of the high complexity with modern wavelength-division multiplexed signals (including the fact that they had to be installed about once every 20 km), the cost of these repeaters is very high.
Karena kompleksitas yang tinggi dengan panjang gelombang-division multiplexing sinyal (termasuk fakta bahwa mereka harus dipasang sekitar sekali setiap 20 km), biaya pengulangan ini sangat tinggi.