Multi-wavelength erbium-doped fiber laser with multiple tuning functions

Abstract

The invention provides a multi-wavelength erbium-doped fiber laser with multiple tuning functions. Through the fiber laser, multiple tuning functions can be performed on wavelength intervals, laser spectral line wavelengths, laser spectral line numbers and laser spectral line spectrum ranges. The laser comprises a comb filter, a circulator, a pumping source, a wavelength division multiplexer, an erbium-doped fiber, a polarization controller and a nonlinear loop mirror. By adjusting the polarization state of input light of the comb filter, three comb spectra with three different wavelength intervals can be output. If the polarization state of the input light is further changed, the laser spectral line wavelengths can be tuned. The laser spectral line numbers and the laser spectral line spectrum ranges can be tuned by adjusting the working state of the nonlinear fiber loop mirror. Besides, the laser spectral line numbers can be fine controlled by adjusting the magnitude of the pumping power. The multi-wavelength erbium-doped fiber laser has the advantages of being low in cost, convenient to tune, good in repeatability, good in stability at room temperature and the like.

Description

technical field [0001] The invention belongs to the field of fiber lasers and relates to a multi-wavelength erbium-doped fiber laser capable of tuning the wavelength interval, laser line wavelength, laser line spectrum range and number of laser lines. Background technique [0002] Since the wavelength division multiplexing technology can greatly improve the optical transmission efficiency and reduce the cost of communication technology, this technology is widely used in the field of optical communication. With the further development of wavelength division multiplexing technology, in order to improve the ability of wavelength division multiplexing, traditional multi-wavelength fiber lasers can no longer meet people's needs. Therefore, looking for a tunable multi-wavelength fiber laser with simple structure, low cost and high efficiency must become the focus of attention. At the same time, the progress and development of fiber optic sensing technology has also continuously p...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of high cost, poor controllability, single function and inconvenient tuning of the existing multi-wavelength fiber laser, and introduces the tunable comb filter mechanism introduced by the comb filter and the intensity-dependent loss mechanism introduced by the nonlinear fiber loop mirror Effectively combined to provide a multi-wavelength erbium-doped fiber laser with good tuning function for wavelength interval, number of laser lines, spectral range of laser lines and wavelength of laser lines

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