Patent ID: 6816299
Filing Date: 2004-11-09
Classification: G02F,H04B

Abstract:
A method for amplitude modulation of an optical signal with a binary data signal, the method comprising the steps of:supplying both the optical signal and the binary data signal to a modulator, whose operating point is adjustable, for producing an optical transmission signal; demodulating the transmission signal or a measurement signal, which is tapped off the transmission signal; converting the demodulated signal to a recovered binary data signal; selecting by filtering out from the recovered data signal both a fundamental frequency and at least one harmonic frequency; deriving from the recovered binary data signal a fundamental frequency control signal and the at least one harmonic frequency control signal; and controlling the operating point of the modulator for optimum adjustment such that the fundamental frequency reaches for a maximum amplitude or power and the at least one of the harmonic frequencies reaches for a minimum amplitude or power.