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9[2]Bell Labs uses ultra-dense WDM to transmit 1022 channels over fiber, Bell Labs transmit 160 Billion Bits on a single fiber wavelength. http://www. bell-lab.com/
10[3]Yamada Y.25GHz spacing ultra-dense WDM transmission experiment of 1Tbit/s(100 WDM×10Gbit/s)over 73000kin using non pre-chirped RZ format[J]. Electron., Lett., 1999,35(25): 2212-2213
