| 摘要 |
An optical modulator is provided comprising a first branch and a second branch, both being connectable to an input, in particular to a light source; wherein the first branch comprises a first modulator; wherein the second branch comprises a second modulator in series connected with a polarization transformer; comprising a combining unit with two inputs that combines the optical fields of the first branch and the second branch; wherein the first modulator is controlled by a first electrical signal comprising a first group of data channels, each utilizing a different carrier frequency; wherein the second modulator is controlled by a second electrical signal comprising a second group of data channels, each utilizing a different carrier frequency; and wherein the carrier frequencies of the first group and the carrier frequencies of the second group are each shifted by a predetermined offset frequency. Also a demodulator is suggested for processing signals conveyed by such optical modulator. Furthermore, methods for modulating and demodulating these signals are provided.
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