Device and method for generating 8 times frequency optical millimeter waves by utilizing lithium niobate modulator

Abstract

The invention discloses a device and a method for generating 8 times frequency optical millimeter waves by utilizing a lithium niobate modulator, mainly applicable to the generation of optical millimeter waves in the radio over fiber (RoF) network. The method as shown in the attached figure comprises the following steps: high-level sideband is generated on the deep modulated nonlinearity by utilizing lithium niobate nested Mach-Zehnder modulator; the sideband interference of 4n+1, 4n+2, and 4n+3 stages can be countervailed under proper voltage offset; the optical wave is inhibited by a filter; as the sideband amplitude of the eighth and higher stages is less than that of the fourth stage sideband, the optical millimeter wave signals are mainly composed of the + / - four stage sideband of which the frequency interval equals to eight times of the local oscillator frequency, and the electric millimeter wave frequency generated by the beat frequency of a photoelectric detector is eight times of the local oscillator frequency of radio frequency. The method has the advantages of low needed local oscillator frequency and modulator response frequency, no amplitude fading of the generated optical millimeter waves when transmitting in the optical fiber, narrow width of the radio frequency signal wires generated during photoelectric transformation and the like, thus having good application prospect.

Description

technical field [0001] The present invention relates to the fields of optical communication and microwave communication, in particular to a method and device for generating high-frequency microwave signals by using relatively mature optical technology in optical communication technology. Background technique [0002] Compared with wired communication, the flexibility and mobility of wireless communication make it have unparalleled advantages. Over the past few years, with the rapid development and wide application of wireless communication services, the bandwidth required for wireless access has increased rapidly, and low-frequency wireless spectrum resources have become increasingly scarce, which drives us to use bandwidth resources when developing new broadband wireless services Rich high frequency band. The millimeter wave in the 40-60GHz frequency band can provide bandwidth resources of several GHz, and can be used for multiple wireless services with data rates up to Gb...

AI Technical Summary

Problems solved by technology

Due to the poor coherence of the optical components involved in the first two methods, the millimeter-wave phase noise generated is large and the spectrum is wide; since the direct modulation of the millimeter-wave signal to the light wave requires a laser with a high response frequency, the direct modulation The method is not suitable for RoF systems in the millimeter wave band; the millimeter wave generation method based on nonlinear effects requires high pump optical power and low conversion efficiency

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