Dynamic calibration device and method for wavelength scanning working curve of tunable laser

Abstract

The invention discloses a dynamic calibration device and method for a wavelength scanning working curve of a tunable laser. The dynamic calibration device comprises a laser driving circuit, an opticalpulse modulator, an optical amplifier, an optical circulator, an optical fiber, a spectrum detection unit, a computer and the tunable laser; a working curve of the laser is calibrated under the parameters of wavelength range, wavelength point number, retention time of each wavelength point, wavelength scanning period and the like of actual scanning work; output light of the laser is modulated into the light pulse, and the Rayleigh scattering light of the light pulse transmitted in the optical fiber is measured, so that the laser wavelength and the side mode rejection ratio under different control signals are obtained, and the consistency of the scanning work and the calibration state of the laser is ensured.

Description

technical field [0001] The invention relates to a calibration device and method for a laser wavelength-control signal working curve, in particular to a dynamic calibration device and method for a tunable laser wavelength scanning working curve. Background technique [0002] Using tunable lasers for spectrum detection and signal demodulation of fiber grating sensors, interferometric fiber sensors, etc., has the advantages of high measurement accuracy, large number of measurement points, moderate cost, etc., and is widely used in aerospace, aviation, marine and other fields. Optical fiber sensing signal detection. In order to obtain accurate spectral signals of fiber grating sensors and interferometric fiber optic sensors, it is necessary to obtain laser wavelength-control signal working curves through calibration (hereinafter referred to as "wavelength-control signal working curves" as "working curves"). [0003] The existing laser working curve calibration method is usually...

AI Technical Summary

Problems solved by technology

[0006] The technical problem solved by the present invention is: for the existing static or quasi-static calibrated tunable DBR laser working curve used for laser wavelength control in the scanning process, the laser wavelength control accuracy and side mode suppression ratio are difficult to meet the requirements of fiber grating sensors, interference The problem of spectral detection requirements of optical fiber sensor; a dynamic calibration device and method for tunable laser wavelength scanning working curve is proposed. Calibrate the working curve of the laser, and obtain the laser wavelength and side mode suppression ratio by modulating the optical pulse and measuring the Rayleigh scattered light transmitted by the optical pulse in the optical fiber, so as to ensure the consistency of the laser scanning work and the calibration state, and ensure that the laser scanning work The wavelength control accuracy and side mode suppression ratio of

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