Patent ID: 8737844
Filing Date: 2014-05-27
Classification: H04B,H04L

Abstract:
1. A method for implementing a Polarization Division Multiplexing Binary Phase Shift Keying (PDM-BPSK) modulation and a Quadrature Phase Shift Keying (QPSK) modulation in a compatible manner, comprising: dividing a direct current (DC) light into a first channel of light and a second channel of light with the same power; separately performing an 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 Binary Phase Shift Keying (BPSK) format; performing a polarization state control on the first optical signal, wherein 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, wherein a phase difference between the first optical signal and the second optical signal after the phase shift is performed on the first optical signal or the second optical signal is π/2 or remains unchanged; and performing an 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.