Method and device for all-optical regeneration of high-speed differential quadrature reference phase shift keying (DQPSK) modulation signal
A technology for modulating signal and regeneration device, which is applied in optics, nonlinear optics, optical waveguide coupling, etc. It can solve problems such as poor stability, high cost, and complex system, and achieve the effect of simple scheme, simple structure, and economical and practical scheme
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Embodiment 1
[0039] Embodiment 1, all-optical regeneration device of high-speed DQPSK modulation signal
[0040] like figure 1 As shown, the device includes:
[0041] The first polarization controller 1: used to convert the deteriorated DQPSK signal light input on the transmission link to 45° linear polarization;
[0042] Differential group delay line: for the DQPSK signal converted by the first polarization controller to realize that the signals on the two polarization states of the x-axis and the y-axis have a delay of one symbol period;
[0043] The first optical coupler 4: used to divide the optical signal after differential group delay into two paths, the first path is used as the real part of the DQPSK signal, and the second path is used as the imaginary part of the DQPSK signal;
[0044] The first path includes: a second polarization controller 2, a second optical coupler 5, and a first polarization beam splitter 7. The real part of the first path DQPSK signal passes through the s...
Embodiment 2
[0053] Embodiment 2, the all-optical regeneration method of high-speed DQPSK modulation signal
[0054] The all-optical regeneration method of the high-speed DQPSK modulation signal in the present invention includes demodulation of the DQPSK signal, regeneration of the OOK signal, and generation of the DQPSK signal after regeneration. Specific steps are as follows:
[0055] The degraded DQPSK signal from the transmission line enters first figure 1 The DQPSK signal demodulation part of the shown regeneration device changes the polarization state of the deteriorated DQPSK signal into a 45° linear polarization state through the first polarization controller 1 (PC1);
[0056] Then the DQPSK signal passes through the differential group delay line (DGD), so that the signals on the two polarization states of the x-axis and the y-axis have a delay of one symbol period;
[0057] Then, the output of the differential group delay line DGD is divided into the same two channels through th...
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