Patent ID: 6879422

Claim:
Externally modulated optical emitter, comprising: an optical source capable of generating an optical carrier signal; an electro-optical modulator capable of receiving a modulating electrical signal and a bias signal, the said modulator comprising: an optical input for an optical carrier signal generated by the said source, at least one electrical input, an optical output for a modulated optical signal; an optical-electrical receiver coupled to the said optical output, capable of converting at least a portion of modulated optical signal into an electrical feedback signal and of making it available at an electrical output; a circuit for controlling the operating point of the electro-optical modulator, connected to the said output of the optical receiver for generating the said electrical bias signal from the said electrical feedback signal; a compensation circuit for generating a compensation signal capable of interacting with the modulated optical signal, the said compensation circuit comprising: an input terminal for taking a fraction of the said modulating electrical signal before it is supplied to the said electrical input, at least one phase-shifting element connected to the said input terminal to invert the phase of the said fraction of the modulating electrical signal, an output terminal capable of being connected to the said at least one electrical input, to obtain an interaction of the compensation signal with the said modulated optical signal, in which the said compensation circuit comprises at least one filtering element for eliminating predetermined spectral components from the said fraction of the modulating electrical signal, and in which the said at least one filtering element is capable of eliminating from the said fraction of the modulating electrical signal the spectral components located in a frequency band external to the band of the said noise.