METHOD AND APPARATUS FOR TRANSMITTING A SIGNAL USING SIMULTANEOUS FM AND AM MODULATION

摘要

A method for transmitting Non-Return-To-Zero (NRZ) binary data contained in respective successive time cells, the data being in the form of an optical signal obtained by amplitude modulation and frequency modulation of an optical carrier wave, with a 0 bit data value having a 0 bit mean amplitude having a 0 bit amplitude time duration and a 0 bit frequency having a 0 bit frequency duration, and a 1 bit data value having a 1 bit mean amplitude having a 1 bit amplitude time duration and a 1 bit frequency having a 1 bit frequency duration; wherein the phase across each 1 bit data value is substantially constant, and the phase of the carrier changes across each and every 0 bit by amount equal to the product of the frequency difference between the 1 bit and the 0 bit and the duration of the 0 bit.