Tunable microwave photon filter based on Brillouin optical fiber laser

Abstract

The invention discloses a tunable microwave photon filter on the basis of a Brillouin optical fiber laser, which belongs to the filed of microwave photonics. The device consists of a Brillouin multiple-wavelength optical fiber laser, a polarization controller, a Mach-Zehnder modulator, a monomode optical fiber and a photoelectric detector. A multiple-wavelength optical signal output by the Brillouin multiple-wavelength optical fiber laser is connected with the optical input end of the Mach-Zehnder modulator through the polarization controller; the radio frequency input end of the Mach-Zehnder modulator loads a radio frequency signal; the optical output end of the Mach-Zehnder modulator is connected with the monomode optical fiber; the other end of the monomode optical fiber is coupled into the photoelectric detector; and a signal acquired by the output end of the photoelectric detector is a microwave filtering signal. Through tuning the wavelength of output laser of the Brillouin optical fiber laser, the tuning of the microwave filtering frequency can be realized.

Description

technical field [0001] The invention relates to the fields of optical communication and wireless communication, and in particular provides a tunable microwave photon filter based on a Brillouin fiber laser. Background technique [0002] Microwave photonics is an emerging interdisciplinary subject. The generation of microwave signals by photonics technology and the processing of microwave signals in the optical domain are research topics that have recently received great attention. This research has great significance in the fields of microwave and optics. application prospects. Microwave photonic filters have extremely important application value in Radio Over Fiber (ROF) systems. Compared with traditional electronic microwave filters, microwave photonic filters have electromagnetic environment compatibility, small size, light weight and wide operating bandwidth. Etc. The basic working principle of the microwave photonic filter is: the radio frequency signal directly or ex...

AI Technical Summary

Problems solved by technology

The performance of microwave photonic filters implemented with a single incoherent light source suffers from phase-induced intensity noise, and the reconfigurability of the filters is greatly limited due to delay tuning difficulties

Microwave photonic filters based on multiple light sources can overcome the above problems, but it has been difficult to find an ideal multi-wavelength light source. Previous research includes using multiple independent lasers with different wavelengths, cutting broadband spectra, using F-P cavity lasers, etc. Multiple independent light sources will cause high cost, cutting spectrum will bring large amplitude noise, and the uneven power of F-P laser mode will affect the filter performance

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