Method for modulating an optical signal and optical transmitter
AssigneeAlcatel
InventorsSébastien Bigo, Eric Barnasson, Gabriel Charlet
Life of this patent
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Abstract
A method for modulating an optical signal includes the following steps: modulating the intensity of the optical signal with a nonreturn-to-zero bit signal, and modulating the phase of the optical signal with a periodic phase-shift signal creating an alternating π-phase shift every second, third or more consecutive bit. An optical transmitter for performing the above method comprises a first modulator (2) modulating the intensity of the optical signal with a nonreturn-to-zero bit signal, and a second modulator (3) modulating the phase of the optical signal with a periodic phase-shift signal creating an alternating π-phase shift every second, third or more consecutive bit.
Claims11
A method for modulating an optical signal, the method comprising:
- first modulating an intensity of the optical signal with a nonreturn-to-zero bit signal;
- and
- second modulating with a Mach-Zender modulator a phase of the optical signal with an alternating π-phase shift every second, third or more consecutive bit using a periodic phase-shift signal, so as to generate an output optical signal comprising the alternating π-phase shift modulation and a nonreturn-to-zero modulated intensity,
- wherein an intensity of the output optical signal between two consecutive “1” bits does not return to zero except at bit transitions where the π-phase shift is performed.
An optical transmitter for modulating an optical signal, comprising:
- a first modulator modulating an intensity of the optical signal with a nonreturn-to-zero bit signal;
- and
- a second modulator modulating a phase of the optical signal with an alternating π-phase shift every second, third or more consecutive bit using a periodic phase-shift signal, so as to generate an output optical signal comprising the alternating π-phase shift modulation and a nonreturn-to-zero modulated intensity,
- wherein an intensity of the output optical signal between two consecutive “1” bits does not return to zero except at bit transitions where the π-phase shift is performed.
Dependencies are inferred from the claim text.