OPTICAL MULTI-VALUE SIGNAL PRE-EQUALIZATION CIRCUIT, OPTICAL MULTI-VALUE SIGNAL PRE-EQUALIZATION TRANSMITTER, AND POLARIZED MULTIPLEX LIGHT PRE-EQUALIZATION TRANSMITTER

摘要

PROBLEM TO BE SOLVED: To reduce a circuit scale for wavelength-dispersed pre-equalization operation.;SOLUTION: An optical multi-value signal pre-equalization circuit comprises: (1) a plurality of look-up tables which are accommodated while relating waveform response components to a sequence of intermediate codes utilizing symmetry of signal point arrangements of multi-value signals or a sequence of intermediate codes represented by polar coordinates; and (2) one or more arithmetic circuits for inputting the waveform response components corresponding to a multi-value signal subjected to transmission from the plurality of look-up tables, arithmetically operating the waveform response components outputted from different look-up tables, and outputting a pre-equalized output waveform corresponding to the multi-value signal.;COPYRIGHT: (C)2014,JPO&INPIT