Single-sideband light-borne microwave signal generation device based on stimulated Brillouin scattering

Abstract

The invention discloses a single-sideband optical-carrying microwave signal generation device based on stimulated Brillouin scattering, comprising: a main laser, a first optical coupler, a second optical coupler, a first adjustable optical attenuator, a second Two tunable optical attenuators, optical polarization controllers, first optical circulators, second optical circulators, slave lasers, single-mode fibers, Mach-Zehnder modulators, optical amplifiers, optical spectrum analyzers, photodetectors and spectrum analysis instrument. Utilizing the present invention, the multispectral line comb spectrum P1 with equal frequency intervals is generated by injecting light into the semiconductor laser, and then modulated by another laser beam obtained by beam splitting of the main laser to obtain carrier-suppressed double-sideband laser as pumping light. The excitation Brillouin scattering effect amplifies one sideband near the optical wavelength of the main laser and attenuates the other sideband, thereby obtaining a single-sideband light-borne microwave signal. With the invention, the frequency of the light-carrying microwave signal can be continuously adjusted, and the frequency up-conversion of the intermediate frequency signal can be realized.

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication and microwave photon signal processing, in particular to a single-sideband optical-carrying microwave signal generation device based on stimulated Brillouin scattering and semiconductor laser light injection technology. Background technique [0002] With the development of multimedia big data services such as IP TV and video on demand, as well as the increasing demand for mobile communication service quality and bandwidth, traditional broadband access methods are facing huge challenges. Radio over Fiber (RoF), which combines the flexibility of wireless communication with the high-bandwidth, low-loss characteristics of optical fiber communication, has attracted extensive research. This technology uses optical fiber media to transmit optical radio frequency signals, providing huge bandwidth for high-speed data transmission in next-generation wireless networks, and has become one...

AI Technical Summary

Problems solved by technology

However, due to the narrow bandwidth of the gain spectrum of stimulated Brillouin scattering (about 30MHz in single-mode fiber), the wavelength of the pump light needs to be very stable to amplify a certain wavelength of light stably.

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