Erbium doped fiber laser with convertible multi-wavelength and mode locking and realization method thereof

Abstract

The invention relates to an erbium doped fiber laser with multi-wavelength and mode locking functions and convertible working state and a realization method thereof, in particular to a laser which can realize switching conversion between multi-wavelength and mode locking, has adjustable output wavelength position of multi-wavelength, and can stably work at room temperature and a realization method thereof. The laser comprises: a gain amplification unit, a polarization control unit, an output coupling unit, a comb filtering unit, an optical isolation unit and a nonlinear fiber loop mirror. The realization method of the laser includes the following steps: incident polarization state and double refraction are adjusted to lead the nonlinear fiber loop mirror inserted in the cavity of the laser to be in different working states, and the multi-wavelength and mode locking functions of the laser are respectively realized according to the different working conditions of the nonlinear fiber loop mirror. The invention has the advantages of convenient toning, low cost, being capable of realizing the two functions of stable multi-wavelength continuous output and mode locking pulse output, and the like, and can satisfy the demand for multifunctional laser light sources of optical time division multiplex / wavelength division multiplex communication technology.

Description

【Technical field】 [0001] The invention relates to the field of lasers, in particular to an erbium-doped fiber laser with multi-wavelength and mode-locking functions and a switchable working state and a realization method thereof. 【Background technique】 [0002] With the development of modern communication technology, improving communication capacity and communication speed has become a key issue in the field of modern communication research. The optical wavelength division multiplexing technology can greatly improve the communication capacity, and the combination of optical time division multiplexing and optical wavelength division multiplexing technology can greatly improve the single-channel rate of the optical communication system. Therefore, optical wavelength division multiplexing and optical time division multiplexing are key technologies for fast, high-capacity communication. [0003] Modern optical fiber wavelength division multiplexing communication systems are dev...

AI Technical Summary

Problems solved by technology

For example, frequency shift feedback technology needs to insert a frequency shifter in the laser cavity, which is expensive; polarization hole burning can only generate a few wavelengths, and the number of wavelengths has no advantage; Brillouin scattering technology, the wavelength interval does not meet the wavelength specified by the International Telecommunication Union. Interval standard, poor practicality

Four-wave mixing technology often requires special fibers such as photonic crystal fibers and dispersion-shifted fibers to enhance nonlinear effects, and the cost is high

Although a variety of technologies can realize multi-wavelength output and mode-locked output of Erbium-doped fiber lasers at room temperature, Erbium-doped fiber lasers with both output functions are relatively rare

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