| 摘要 |
The present document relates to optical transmission systems. In particular, the present document relates to high efficiency wavelength division multiplexing (WDM) optical communication systems. An optical transmitter (210) adapted to transmit an optical signal on an optical wavelength division multiplexed (WDM) transmission channel to a corresponding optical receiver (230) is described. The optical transmitter (210) comprises a symbol generation unit (211) adapted to convert input data into a sequence of data symbols at a symbol rate B; with B being a real number greater zero; an amplitude modulation unit (220) adapted to modulate an amplitude of every N th data symbol in a sequence derived from the sequence of data symbols, thereby creating a modulated sequence (260) of data symbols; wherein N is an integer; wherein N>2; and a digital-to-optical converter (214, 215, 216) adapted to convert a sequence derived from the modulated sequence (260) of data symbols into an optical signal to be transmitted to the optical receiver (230). |
