Abstract: A dynamic dispersion detecting method and apparatus are disclosed. The apparatus includes a tunable dispersion compensation module (101), a demodulator (102), a receiver (103), a partial band radio frequency power detecting unit (104), and an electrical signal ratio calculating unit (105). The method includes: demodulating a phase of a received optical signal; converting the demodulated optical signal into an electrical signal; sampling radio frequency power of the electrical signal to obtain an radio frequency signal; obtaining an electrical signal ratio of the radio frequency signal; and comparing a value of a currently detected electrical signal ratio with the values of the previously detected electrical signal ratios, tuning a dispersion compensation value according to a comparison result to find a peak electrical signal ratio, and obtaining a residual dispersion value of a system according to the peak electrical signal ratio.

Abstract: The method includes: receiving a first Non Return to Zero (NRZ) data signal and a synchronous clock signal, and performing Return to Zero (RZ) processing to generate a first complementary RZ data signal pair; receiving a second NRZ data signal and a synchronous clock signal, and performing RZ processing to generate a second complementary RZ data signal pair; and modulating the first complementary RZ data signal pair and the second complementary RZ data signal pair on light to generate an RZ-Differential Quadrature Phase Shift Keying (RZ-DQPSK) optical signal. Through the method and device, RZ processing are performed on the NRZ data signals to generate the complementary RZ data signal pairs, and the complementary RZ data signal pairs are modulated on the light, thereby reducing the cost and the insertion loss of the entire device, lowering the requirements for input optical power and reducing the complexity of loop circuit control.

Abstract: A dynamic dispersion detecting method and apparatus are disclosed. The apparatus includes a tunable dispersion compensation module (101), a demodulator (102), a receiver (103), a partial band radio frequency power detecting unit (104), and an electrical signal ratio calculating unit (105). The method includes: demodulating a phase of a received optical signal; converting the demodulated optical signal into an electrical signal; sampling radio frequency power of the electrical signal to obtain an radio frequency signal; obtaining an electrical signal ratio of the radio frequency signal; and comparing a value of a currently detected electrical signal ratio with the values of the previously detected electrical signal ratios, tuning a dispersion compensation value according to a comparison result to find a peak electrical signal ratio, and obtaining a residual dispersion value of a system according to the peak electrical signal ratio.

Abstract: The method includes: receiving a first Non Return to Zero (NRZ) data signal and a synchronous clock signal, and performing Return to Zero (RZ) processing to generate a first complementary RZ data signal pair; receiving a second NRZ data signal and a synchronous clock signal, and performing RZ processing to generate a second complementary RZ data signal pair; and modulating the first complementary RZ data signal pair and the second complementary RZ data signal pair on light to generate an RZ-Differential Quadrature Phase Shift Keying (RZ-DQPSK) optical signal. Through the method and device, RZ processing are performed on the NRZ data signals to generate the complementary RZ data signal pairs, and the complementary RZ data signal pairs are modulated on the light, thereby reducing the cost and the insertion loss of the entire device, lowering the requirements for input optical power and reducing the complexity of loop circuit control.