Generation device and method for random Brillouin dynamic grating

Abstract

The invention discloses a generation device for a random Brillouin dynamic grating. The generation device comprises a laser source, a 1*2 optical fiber coupler, a first electrooptical modulator, a first random optical pulse generator, a first optical isolator, a first erbium-doped optical fiber amplifier, a single side band modulator, a microwave source, a first polarization controller, a second electrooptical modulator, a second random optical pulse generator, a second optical isolator, a delay optical fiber, a second erbium-doped optical fiber amplifier, a second polarization controller, a polarization beam combiner and a polarization maintaining optical fiber. Two different random optical pulses of which the repetition frequency randomly changes are taken as two beams of pump light, twobeams of pump light are independently injected from two ends of the polarization maintaining optical fiber, the polarization directions of two beams of pump light are the same, a frequency differenceis the Brillouin frequency shift of the optical fiber, and a new Brillouin grating is generated on the meeting position of the polarization maintaining optical fiber. The grating period of the randomBrillouin dynamic grating is uneven, the generated grating is randomly distributed and can be used for providing random feedback, photon localization is realized, and therefore, the random optical fiber laser is constructed.

Description

technical field

[0001] The invention relates to the technical field of Brillouin dynamic gratings, in particular to a device and method for generating random Brillouin dynamic gratings. Background technique

[0002] Brillouin dynamic grating (BDG) has been used in optical fiber sensing, variable optical delay, all-optical signal processing, high-precision spectrum analyzer and other fields due to its advantages of all-optical generation and flexible and controllable parameters. The concept of Brillouin dynamic grating was first proposed in 2008. The Brillouin dynamic grating is produced by injecting two beams of pump light with the same polarization direction and a frequency difference of Brillouin frequency shift into both ends of the fiber. Interference occurs in the medium, and the interference signal modulates the refractive index of the fiber to form a Brillouin dynamic grating (Optics Letters, 2008, 33(9):926-928.). At present, the generation of Brillouin dynamic grat...

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