A receiving method and system for an orthogonal mode division multiplexing signal

Abstract

The invention discloses a receiving method of an orthogonal mode division multiplexing signal, which includes: for the transmitted orthogonal multiplexing signal, first suppressing the dispersion between modules and eliminating the time delay between different signals; secondly, Separate the signal light of each orthogonal mode, and then receive the separated optical signals of different modes, and perform digital signal processing on the received signal by using MIMO technology. The present invention can effectively improve the transmission capacity and transmission distance of the system; the method of using coherent reception can improve the flexibility of reception, and the method of using heterodyne detection is very helpful for improving the sensitivity of the receiving system, and it is also effective for the suppression of background noise Very good effect; coherent receiving technology can use the coherent mixing of signal light and local oscillator light on the photosensitive surface of the detector to convert the frequency of the received signal from 10 14 Hz optical signal field conversion to 10 8 ~10 9 Hz electrical signal field is beneficial to reduce the complexity of digital signal processing.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and system for receiving an orthogonal mode division multiplexing signal. Background technique [0002] With the rapid development of Internet of Things, 4K high-definition video, cloud data, virtual reality technology (VR) and other services, and the coming 5G era, people's demand for network bandwidth continues to grow. After the use of a series of multiplexing technologies such as wavelength division multiplexing (WDM), frequency division multiplexing (FDM), time division multiplexing (TDM), and polarization multiplexing (PDM), the transmission capacity of single-mode optical fiber communication systems has continued to increase. approaching the Shannon limit. Against this background, the researchers focused on untapped dimensions in optical fibers. Space Division Multiplexing (SDM) technology utilizes a relatively large number of modes carried by few...

AI Technical Summary

Problems solved by technology

Under ideal conditions, any two modes transmitted in a few-mode fiber satisfy orthogonality, but under actual conditions, due to flaws in the preparation of the few-mode fiber, there will be stretching and twisting during use. It will lead to the superposition of the mode fields between the modes in the few-mode fiber, thus destroying the orthogonality between the modes transmitted in the few-mode fiber, and finally causing the coupling between the modes, which not only damages the transmission signal, And limit the transmission bandwidth

At the same time, in the MDM system, since the mode multiplexer and demultiplexer will couple the light of each mode, the differential group delay between the modes and the transmission loss of the optical fiber will cause problems such as the crosstalk between the modes, and the signal will be distorted.

Although the method of physical channel optimization can effectively suppress the nonlinear damage of the channel, the nonlinearity between the signal modes at the receiving end cannot be completely eliminated, especially in the case of intermodal crosstalk, the nonlinear effect between the modes is very serious

[0003] Orthogonal mode division multiplexing signals can effectively solve the aforementioned problems, but how to quickly and effectively generate orthogonal mode multiplexing signals, as well as the research on the reception and demodulation based on this kind of orthogonal mode division multiplexing signals are relatively vacant. Can be effectively used in the actual communication process

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