Receiving apparatus and method for differential quadrature phased shift keying DQPSK signal

Abstract

The invention relates to a receiving device of difference orthogonal phase shift keying DQPSK signals and a method thereof, wherein the device comprises a splitter, wherein the splitter is connected with two optical band pass filters and the two optical band pass filters are respectively connected with a photodetector. DQPSK signals are filtered and demodulated through the optical band pass filters, photoelectric conversion is carried out through the photodetector to restore data signals, which not only avoids the problems of bad stability and polarization independence due to MZI, but also greatly improves the performance of an optical transmission system, simultaneously, the transmission rate of the DQPSK signals is higher, the operation of the optical band pass filters is easier, the problem that the manufacture of the MZI has high difficulty along the improvement of the signal transmission rate is solved, and the cost of the DQPSK signal receiving device is greatly saved. The method is used to demodulate the DQPSK signals through filtering, and the problems of complex demodulation, bad transmission performance and high cost due to the MZI are solved.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a differential quadrature phase shift keying DQPSK signal receiving device and method, and a DQPSK signal acquisition method. Background technique [0002] In the optical transmission system, many transmission impairments in the transmission link, such as chromatic dispersion, nonlinear effects, polarization mode dispersion, etc., affect the signal transmission performance. In recent years, with the rapid development of optical transmission system code pattern technology, new modulation formats that can effectively reduce the impact of transmission link damage have emerged. Among them, the differential quadrature phase-shift keying (DPSK) (DQPSK), as a vector modulation format, is recognized as the most promising modulation format for transmission systems above 40Gb / s. Studies have shown that: DQPSK has a very narrow spectrum width, and can achieve 12.5 in a 10Gbit / s DWDM sys...

AI Technical Summary

Problems solved by technology

[0005] The DQPSK signal receiving end uses two MZIs and two balanced receivers to demodulate the DQPSK signal. Not only the demodulation method is complicated and the cost is high, but also the MZI has poor stability and polarization correlation, which greatly affects the performance of the optical transmission system; and as As the signal transmission rate increases, the accuracy requirements for MZI are also higher, and the cost of making MZI is also higher.

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