Method and device for generating and receiving OOFDM (Orthogonal Frequency Division Multiplexing) signal and wavelength division multiplexing system

Abstract

The embodiment of the invention discloses a method and a device for generating and receiving an OOFDM (Orthogonal Frequency Division Multiplexing) signal and a wavelength division multiplexing system, belonging to the communication field, wherein the method for generating the OOFDM signal comprises the steps of: converting one path of serial high-speed data into N paths of parallel low-speed data; respectively modulating and mapping the N paths of parallel low-speed data to obtain N paths of information sequences; expanding the N paths of information sequences into 2N+2 paths of information sequences with Hermitian symmetrical structures; carrying out rapid inverse Fourier conversion on the 2N+2 paths of information sequences to obtain an OFDM baseband signal; carrying out digital-to-analogue conversion on the OFDM baseband signal to obtain an OFDM analog signal; and modulating the OFDM analog signal to an optical carrier wave to obtain the OOFDM signal. The OOFDM signal generated in the embodiment of the invention is received without tracking and compensating phase and frequency with a complex algorithm, therefore, the cost of realizing the system is lowered.

Description

Technical field [0001] The present invention relates to the field of communications, and in particular to a method, device and wavelength division multiplexing system for generating and receiving OOFDM signals. Background technique [0002] At present, with the rapid growth of broadband services, higher requirements have been put forward for the transmission capacity of the core backbone network, and thus there is a demand for 100Gb / s and over 100Gb / s long-distance backbone optical fiber transmission systems. [0003] In the prior art, there has been a scheme for realizing 100Gb / s signal transmission using COOFDM, a coherent optical orthogonal frequency division multiplexing system. The structure of the coherent optical orthogonal frequency division multiplexing system is as follows figure 1 Shown. The COOFDM system includes a transmitting end and a receiving end. The transmitting end includes an orthogonal frequency division multiplexing transmitter and an optical upconverter, and...

AI Technical Summary

Problems solved by technology

[0005] During the research process, the inventor found at least the following problems in the prior art: when the receiving end receives the OOFDM signal, the optical downconverter adopts coherent reception, so it is sensitive to the frequency offset and phase noise between the local oscillator light and the optical carrier, Therefore, the line width of the laser 1 at the transmitting end and the laser 2 at the receiving end is required to be extremely narrow, which increases the cost of the system, and it is necessary to use complex algorithms to track and control the frequency and phase of the laser light generated by the laser 2 at the receiving end, such as figure 1 The frequency compensation and subcarrier recovery modules in the OFDM receiver need to use complex algorithms to track and control the frequency and phase of the laser light generated by the laser 2, so as to eliminate the frequency difference and phase difference between the local oscillator light and the optical carrier, increasing the Difficulty and cost of system implementation

Images