Up-conversion device capable of achieving full-gloss microwave based on cross polarization modulation

Abstract

The invention discloses an up-conversion device capable of achieving full-gloss microwave based on cross polarization modulation. The up-conversion device comprises a narrow line width laser, a first polarization modulator, a microwave signal source, a first polarization controller, a first optical filter, a circulator, a polarization beam splitter, a third polarization controller, a fourth polarization controller, an optical coupler, a high nonlinear optical fiber, a tunable laser, a waveform generator, a strength modulator, a second polarization controller, a polarizer, a second optical fiber, a single mode optical fiber, a photoelectric detector, an electric amplifier, an electric frequency mixer and a low pass filter. The up-conversion device can solve the problems of base band digital signal up-conversion in a radio over fiber system, the change, caused by dispersion, of microwave power along with microwave frequency and periodic damping, caused by the change of propagation length, of microwave power.

Description

technical field [0001] The invention belongs to the field of microwave photonics, and more specifically relates to an all-optical microwave up-conversion device based on cross-polarization modulation. Background technique [0002] In order to meet the needs of users for mobile data services and multimedia big data services, radio frequency over optical technology has emerged as the times require. Radio frequency over fiber technology combines the flexible advantages of wireless communication technology and the broadband and low-loss advantages of optical fiber communication technology. It uses analog optical fiber links instead of metal wires or the atmosphere to transmit high-frequency signals, thereby greatly expanding the coverage of base stations and reducing The cost of wireless communication network construction. The use of analog optical fiber links to transmit radio frequency signals solves the transmission and cost problems of high frequency signals, and also has s...

AI Technical Summary

Problems solved by technology

At present, most of the up-conversion technologies use electro-optical modulators, which inevitably require electro-optic conversion, so the response speed of up-conversion is slow, and the bandwidth of the modulator seriously limits the operating frequency of up-conversion.

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