Optical signal transmission device and method based on digital predistortion in symbol domain

An optical signal transmission device based on digital predistortion in a symbol domain, the optical signal transmission device being arrangeable in an optical transmitter, the optical signal transmission device comprising:

• a memory;
• and
• a processor coupled to the memory to control execution of a process to:
• perform digital predistortion processing on a symbol sequence of a signal to be transmitted to obtain a digital predistortion processed signal;
• perform short-pulse shaping processing on the digital predistortion processed signal to obtain a short-pulse shaping processed signal, a trailing attenuation of the short-pulse shaping processed signal pulse being fast and a swing of the short-pulse shaping processed signal pulse being small, a memory length introduced by the short-pulse shaping processing is less than or equal to a memory length of the optical transmitter, a filter used in the short-pulse shaping has a larger roll-off coefficient than a filter used in long-pulse shaping;
• and
• generate an optical signal based on the short-pulse shaping processed signal;
• perform filtering processing on the generated optical signal by using an optical filter to reduce a spectral bandwidth occupied by the optical signal, to transmit the optical signal with a reduced spectral bandwidth.