Vector radio frequency signal generation system based on polarization multiplexing intensity modulator

Abstract

The invention belongs to the technical field of radio over fiber communication, and particularly relates to a vector radio frequency signal generation system based on a polarization multiplexing intensity modulator. The system comprises a laser, a polarization beam splitter, a first radio frequency signal source, a second radio frequency signal source, a polarization multiplexing intensity modulator, a polarization beam coupler, an optical amplifier, an optical filter and a photoelectric detector which are connected in sequence, according to the invention, a polarization multiplexing intensitymodulator is combined with devices such as an optical filter and a photoelectric detector to generate a vector radio frequency signal; a photon synthesis method is adopted, and polarization multiplexing is utilized to overcome crosstalk of optical signals with different frequencies; one modulator bears RF signals with different frequencies and converts the RF signals into optical signals, the optical signals are transmitted through the optical fibers, the polarization directions of the two radio-frequency signals are orthogonal, and the PD has no interference, so that the system performance of optical fiber wireless converged communication is effectively improved, and huge advantages are brought into play in an access network which takes an ROF system as a main part in the future.

Description

technical field [0001] The invention belongs to the technical field of wireless communication over light, and in particular relates to a vector radio frequency signal generation system based on a polarization multiplexing intensity modulator. Background technique [0002] Radio-over-Fiber (ROF) technology has attracted much attention due to its high effective bandwidth, good mobility, and low transmission loss, and is expected to emerge in the future access network. At the same time, the vector modulation format can transmit more information in a limited bandwidth due to its high spectral efficiency, which can reduce the bandwidth requirements of optoelectronic devices and improve the sensitivity of the receiver, so it has also been widely studied. The combination of vector modulation and optical wireless communication can greatly increase the system transmission capacity while maintaining its excellent performance, and it is bound to become a key technology in the future. ...

AI Technical Summary

Problems solved by technology

However, this method of electrical multiplexing is used to synthesize and then modulate an intensity modulator to generate multi-frequency ROF signals. The synthesis of electrical signals is easy to generate reflections, etc., resulting in crosstalk.

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