Single-sideband optical carrier microwave signal generating device based on stimulated Brillouin scattering

Abstract

The invention discloses a single-sideband optical carrier microwave signal generating device based on stimulated Brillouin scattering, comprising a master laser, a first optical coupler, a second optical coupler, a first adjustable optical attenuator, a second adjustable optical attenuator, an optical polarization controller, a first optical circulator, a second optical circulator, a slave laser, a single-mode optical fiber, a Mach-Zehnder modulator, an optical amplifier, a spectrum analyzer, a photoelectric detector, and a spectrum analyzer. Light is injected into the semiconductor lasers to generate multispectral comb spectra P1 at equal frequency intervals. Then, the other laser beam obtained by the master laser through beam splitting is modulated to obtain carrier suppression double-sideband laser which is used as pumping light. Though the stimulated Brillouin scattering effect in the optical fiber, one sideband near the optical wavelength of the master laser is amplified, and the other sideband is attenuated, thus obtaining a single-sideband optical carrier microwave signal. By adopting the device, continuously adjustable frequency of optical carrier microwave signals and up-conversion of intermediate-frequency signals 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...

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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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