METHOD AND APPARATUS FOR COMPATIBLY REALIZING PDM-BPSK AND QPSK MODULATION

摘要

Embodiments of the present invention disclose a method and an apparatus for implementing PDM-BPSK modulation and QPSK modulation in a compatible manner. The method includes: dividing a DC light into a first channel of light and a second channel of light with the same power; separately performing optoelectrical modulation on the first channel of light and the second channel of light and correspondingly outputting a first optical signal and a second optical signal in a BPSK format; performing polarization state control on the first optical signal, where a polarization state of the first optical signal on which the polarization state control is performed is perpendicular to or consistent with a polarization state of the second optical signal; performing a phase shift on the first optical signal or the second optical signal, where a phase difference between the first optical signal and the second optical signal on which the phase shift is performed is À/2 or remains unchanged; and performing optical signal combination with the polarization state preserved on the first optical signal and the second optical signal after the polarization state control and the phase shift, and outputting a PDM-BPSK modulation optical signal or a QPSK modulation optical signal. The present invention is applicable to implementing the two types of modulation manner PDM-BPSK and QPSK in the compatible manner.