This document relates to an optical transmission system. Specifically, this document relates to a high efficiency wavelength division multiplexed (WDM) optical communication systems. Optical wavelength division multiplexing (WDM) optical transmitter configured to transmit optical signals to corresponding optical receiver (230) over a transmission channel (210) is described. Optical transmitter (210), the input data, a symbol generating unit configured to convert a sequence of data symbols (211) at a symbol rate B, and a symbol generation unit B is a real number greater than zero and (211) is configured to modulate the amplitude of the N number every data symbol in the sequence derived from the sequence of data symbols, whereby the amplitude modulation unit that generates a modulated sequence (260) of data symbols A (220), N is an integer, the N 2, an amplitude modulating unit (220), a sequence derived from the modulated sequence of data symbols (260), an optical receiver (230) Digital configured to convert an optical signal to be transmitted to - and an optical transducer (214, 215, 216).
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