Method and system for generating quadruplicated frequency optical millimeter waves

Abstract

The invention discloses a method and system for generating quadruplicated frequency optical millimeter waves based on stimulated Brillouin scattering effect. The method comprises the steps that the beat frequency of Stokes light and pump light produced by Brillouin scattering is used as a drive signal of a Mach-Zehnder modulator to modulate output light of a laser device and form a self-starting feedback loop; the amplification effect of Brillouin scattering is utilized to amplify a negative first-order sideband and restrain a positive first-order sideband; the intensity of the Stokes light and corresponding millimeter wave beat frequency are further enhanced, so that modulation depth is increased, and then the amplitude of positive and negative second-order sidebands is enhanced; the optical millimeter waves which are four times of Brillouin frequency shift fB are produced through a wavelength interleaver in a separated mode and output. According to the method, an RF source and a complex control system are not required, and a 4fB optical millimeter wave signal can be produced only through the Mach-Zehnder modulator, the wavelength interleaver, a nonlinear medium segment, a photoelectric detector and an RF amplifier. The method and system for generating the quadruplicated frequency optical millimeter waves have the advantages that stability is high, multiple frequency efficiency is high, and device cost is low.

Description

technical field [0001] The invention relates to the fields of optical communication and millimeter wave communication, in particular to the generation of an optical carrier of an optical carrier radio frequency (RoF) system central station, and provides an optical carrier millimeter wave generation method with high generation stability, high frequency doubling efficiency and low cost, and system. Background technique [0002] RoF (Radio over Fiber) technology uses analog fiber links to transmit microwave and millimeter-wave signals. It combines the advantages of optical communication technology and microwave communication technology, enabling wireless communication to have wider cellular coverage, wider bandwidth, and lower costs. , lower power consumption and other advantages, has important application prospects, is one of the international research hotspots. How to generate low-noise, narrow linewidth, and high-stability optical carrier millimeter waves is a key issue for...

AI Technical Summary

Problems solved by technology

However, the system structure is complex and requires reference light

The third method is to use a dual-frequency output laser to generate optically-carried millimeter waves. Although high-order frequency multiplication output has been achieved, and the wavelength intensity is relatively uniform, it is greatly affected by high-order nonlinear effects and external temperature and other factors. , to avoid the frequency drift of each longitudinal mode, a complex control system and precise and complex parameter adjustment are required, and the bandwidth is on the order of MHz

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