Methods, devices and systems for generating and receiving difference quadrature phase shift keying codes

Abstract

The embodiment of the invention relates to the field of communication transmission, and particularly discloses methods, devices and systems for generating and receiving difference quadrature phase shift keying (DQPSK) codes. The device for generating the difference quadrature phase shift keying (DQPSK) codes comprises a laser, a time division multiplex device, a precoding unit, a first control unit, a delay adjustable unit, a third delay adjustable unit and a double parallel modulator. The device for receiving the difference quadrature phase shift keying (DQPSK) codes comprises an optical splitter, a second control unit, a first interferometer, a second interferometer, a first balance receiver, a second balance receiver and a time division multiplex device. By adopting the technical scheme of the embodiment of the invention, the nonlinear effect of signals in the optical fiber transmission is reduced, and the optical transmission performance is improved.

Description

technical field [0001] The invention relates to the field of communication transmission, in particular to a method, device and system for generating and receiving differential quadrature phase-shift keying codes. Background technique [0002] The ever-increasing video services place higher demands on the capacity of the transmission network. At present, the main high-end line bearer rate of the optical transport network is 10Gb / s, and the high-end bearer line rate of the next-generation optical network is 40Gb / s or higher than 40Gb / s. At the same time, the capacity of Ethernet services is increasing at a rate of 10 times, and its bearer bandwidth requirements will also increase by a factor of 10. [0003] The optical line modulation pattern is very critical to the optical transmission system, and the choice of the pattern directly affects the transmission performance, spectral efficiency, nonlinear tolerance, and dispersion tolerance of the system. In the 10Gb / s optical tr...

AI Technical Summary

Problems solved by technology

Non-linear effects limit the distance that optical signals can travel in optical fibers

[0005] During the research process, the inventor found that the DQPSK optical signal in the prior art has relatively large power fluctuations, which aggravates the nonlinear effect of optical fiber transmission; and the constellation points change too much, so it is very sensitive to nonlinear phase noise, which affects Optical Signal Transmission Performance

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