Multi-carrier coherent reception electric treatment method, device and system

Abstract

The embodiment of the invention relates to the communication transmission field, in particular discloses a multi-carrier coherent reception electric treatment method, device and system. The device comprises a photon carrier separator, a first polarization controller and a second polarization controller, a sub carrier generating module as well as a first coherent reception electric treatment module and a second coherent reception electric treatment module; wherein the photon carrier separator is used for extracting two single carrier dual-polarization signals; the first polarization controllerand the second polarization controller respectively are used for polarization control on the two single carrier dual-polarization signals, so as to generate two polarization control signals; the sub carrier generating module is used for generating two photon carriers which are the same with the wavelength of the two single carrier dual-polarization signals respectively; the first coherent reception electric treatment module and the second coherent reception electric treatment module are respectively used for coherent reception electric treatment on the two single carrier dual-polarization signals and the two photon carriers, so as to obtain two polarization state signals. The invention solves the problem that ADC chip sampling rate requirement is high as baud rate is high in signal coherent reception and improves stability of transport network.

Description

technical field [0001] The present invention relates to the field of communication transmission, in particular to a method, device and system for multi-carrier coherent reception electrical processing. Background technique [0002] With the development of communication technology, the single-wavelength transmission rate is evolving from 10G to 40G and 100G, and system tolerances such as chromatic dispersion (CD) and polarization mode dispersion (PMD) are getting smaller and smaller. Key factors restricting long-distance transmission. The industry tends to adopt the method of reducing the baud rate and coherent receiving electrical processing to compensate various damages in transmission and improve the tolerance of CD and PMD. However, for the ADC (Analog digital converter, analog-to-digital conversion device) and algorithm processing chip requirements are still high. [0003] figure 1 It is a schematic diagram of the principle of single-carrier dual-polarization signal g...

AI Technical Summary

Problems solved by technology

[0005] But at the same time, during the research process, the inventor found that the existing technology only modulates polarization-multiplexed QPSK signals on one carrier, such as the single-carrier PDM-QPSK signal described in the above scheme, and one symbol of the signal contains 4 A bit (I, Q electric signal on the two polarization state signals of X, Y), under the same symbol rate, its corresponding baud rate is relatively high, and the sampling rate of the ADC chip using coherent electrical processing is very high. , the bandwidth requirements for receiver optical devices are also relatively high, which is not conducive to the realization of products, and the spectrum utilization rate is not high

Images