System for generating optical cable-carried terahertz signal based on two-stage single-side band modulation

Abstract

The invention belongs to the technical field of optical fiber communication and wireless communication convergence, in particular to a system for generating an optical cable-carried terahertz signal based on two-stage single-side band modulation. The system consists of three parts: an optically inhibited carrier double-side band signal generating part, a two-stage single-side band modulation partand a terahertz wave transmitting and receiving part. The two-stage single-side band modulation part which is the core part of the system of the invention selects one side band of a carrier-inhibiteddouble-side band to perform a primary stage signal-band data modulation and uses base band signal-side band modulation technology in the data modulation process again so as to generate the two-stage cascade single-band modulation. The system has the advantages of simple structure, low cost, low element requirements, compatibility with the prior core net system, and the like.

Description

technical field [0001] The invention belongs to the technical field of fusion of optical fiber communication and wireless communication, and specifically relates to a technology for generating terahertz waves in a subcarrier multiplexing manner, a dual-stage single-sideband modulation technology, and a ToF communication system composed of transmission and reception of terahertz signals. Background technique [0002] As people's demand for high-speed communication network transmission bandwidth increases day by day, the requirement for the communication system to extend to higher frequency bands is becoming more and more urgent. At present, the personal area network standard of broadband wireless communication has stipulated the 60GHz frequency band, and the further increase of the frequency band will enter the terahertz band (THz wave frequency ranges from 0.1 to 10THz). Therefore, the study of terahertz wave communication can expand the spectrum of next-generation broadband...

AI Technical Summary

Problems solved by technology

Although ToF technology has attracted much attention, it will face the problem of fiber channel chromatic dispersion when transmitting high-frequency signals, which will not only produce frequency fading effects, but also cause delay chirp of information symbols, which seriously affects signal transmission quality

Among them, the fading effect causes the transmitted signal to produce cosine wave fading, which means that the signal will disappear in some fading nodes, resulting in an increase in the bit error rate, thereby directly reducing the communication performance

According to reports, there are some schemes that can overcome the effects of dispersion fading, such as: adding dispersion compensating fiber, using chirped Bragg gratings, multi-section DBR semiconductor lasers, and equal-amplitude heterodyne post-equalization processing signals, etc., but these methods have not fundamentally Solve the impact of dispersion fading effect

Images