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

A differential quadrature phase shift and keying technology, applied in the field of communication transmission, can solve problems such as aggravating the nonlinear effect of optical fiber transmission, limiting the distance of optical signal transmission, and sensitivity to nonlinear phase noise, so as to improve optical transmission performance and reduce Sensitivity, the effect of reducing power fluctuations

Active Publication Date: 2010-10-20
HUAWEI TECH CO LTD
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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 fluctuat

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

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Embodiment Construction

[0026] In order to make it easier for those skilled in the art to understand and realize the present invention, the embodiments of the present invention are described in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0027] The schematic diagram of the device for generating differential quadrature phase-shift keying codes according to the embodiment of the present invention is as follows Figure 4 shown.

[0028] It includes a laser, a time division multiplexing device, a precoding unit, a first control unit, an adjustable delay unit and a double parallel modulator. A laser for outputting an optical signal. The time division multiplexing device is used for decomposing the service data to be transmitted into first sub-service data and second sub-service data. A precoding unit is configured to perform precoding processing ...

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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 a 10Gb / s optical tran...

Claims

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Application Information

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IPC IPC(8): H04L25/03H04L27/34H04L27/20H04B10/155H04B10/556H04B10/60
Inventor 徐晓庚
Owner HUAWEI TECH CO LTD
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