Method, device and system for multicarrier polarization multiplex transmission

Abstract

The embodiment of the invention provides a method, a device and a system for multicarrier polarization multiplex transmission. The method for coherently receiving a multicarrier polarization multiplex signal comprises the following steps of: splitting a power beam of a multicarrier signal so as to obtain at least a first signal and a second signal, performing unifrequency modulation on a light source light-wave at a receiving terminal so as to generate at least a first subcarrier and a second subcarrier, combining the first signal with the first subcarrier, combining the second signal with the second subcarrier, respectively performing coherent mixing reception so as to obtain an eight-path electric signal, and performing the electric treatment on the eight-path electric signal so as to obtain an original eight-path signal. In the process of multicarrier coherent reception, the multicarrier signal is divided into at least two paths and then each path is performed coherent reception. Compared with the method of signal carrier coherent reception, the method of the invention decreases a half of the code rate at a sending terminal so as to decrease a half of the sampling rate of an A / D converter at the receiving terminal and weaken the limitation of the high speed A / D converter on the whole system engineering.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for multi-carrier polarization multiplexing transmission. Background technique [0002] With the development of optical communication, more high-order optical modulation formats have emerged to meet the requirements of high speed and large capacity. People began to pay attention to the research on the modulation format of polarization multiplexing. At present, coherent electrical processing technology is mostly used for the reception of polarization multiplexing modulation format. [0003] The existing technology generally adopts the single-carrier dual-polarization coherent electrical processing technology, that is, the light emitted by the LD (Laser Diode, laser diode) is modulated (or not modulated) by the RZ (Retum to Zero code, return-to-zero code) waveform, which is NRZ ( Non-Return to Zero code, non-return-to-zero code) waveform), sent to PBS ...

AI Technical Summary

Problems solved by technology

In the case of a certain bit rate, the symbol rate of the sending end is high, the baud rate of the line is high, and the sampling rate of the analog-to-digital converter (ADC) at the receiving end is high, which is not conducive to the realization of the product and extremely Substantially increases the cost of product realization

For example: for a 43Gbit / s transmission system, the line baud rate is 10.7Gbaud / s, when the coherent receiver performs analog-to-digital conversion, an ADC with a sampling rate of at least 22Gsample / s is required; for a 112Gbit / s system, the line baud rate is 28Gbaud / s, when the coherent receiver performs analog-to-digital conversion, an ADC with a sampling rate of at least 56Gsample / s is required. Such a high sampling rate requirement for the ADC is not conducive to the realization of the coherent receiver, and even if it is realized, it will greatly increase reduces the cost of implementing a coherent receiver

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