Method and apparatus for shaping a binary signal
AssigneeAlcatel
InventorsDominique Chiaroni, Corinne Chauzat, Michel Sotom, Dominique de Bouard
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Abstract
In order to re-synchronize and shape a binary signal of bit time T0, a method includes forming a number p of sampled signals obtained by causing the signal to modulate pulses that are of frequency 1/T0 and of duration substantially equal to T0/p, and that are carried by p optical carriers having different wavelengths. The method also includes combining delayed signals that are obtained by applying delays to the sampled signals, such that any two consecutive delayed signals are offset in time by T0/p. The method applies to optical communications systems.
Claims10
A method of shaping an input signal whose amplitude is modulated between high levels and low levels representing binary data contained in successive bit times each having duration T0, said method comprising:
- forming a number p of sampled signals, where p is an integer, obtained by amplitude modulating p optical carrier waves having different wavelengths, each sampled signal comprising samples in the form of pulses of frequency 1/T0, of a determined duration not greater than T0/p, and of an amplitude that is a function of the amplitude of the input signal;
- and
- forming a re-synchronized signal constituted by a combination of delayed signals obtained by applying delays to said sampled signals such that any two consecutive delayed signals are offset in time substantially by said determined duration.
Apparatus for shaping an input signal whose amplitude is modulated between high levels and low levels representing binary data contained in successive bit times each having duration T0, said apparatus comprising:
- first means for forming a number p of sampled signals, where p is an integer, obtained by amplitude modulating p optical carrier waves having different wavelengths, each sampled signal comprising samples in the form of pulses of frequency 1/T0, of a determined duration substantially equal to T0/p, and of an amplitude that is a function of the amplitude of the input signal;
- and
- second means for forming a re-synchronized signal constituted by a combination of delayed signals obtained by applying delays to said sampled signals such that any two consecutive delayed signals are offset in time substantially by said determined duration.
Dependencies are inferred from the claim text.