Method and device for obtaining multi-wavelength laser

Abstract

The invention relates to a method and a device for obtaining multi-wavelength laser.The prior art features high cost and difficult control over wave length interval.In the method of the invention, a corresponding component is selected according to spectral range of multi-wavelength laser, then a wavelength-fixed semiconductor laser unit and a wavelength-tunable semiconductor laser unit are selected; finally wavelength of the wavelength-tunable semiconductor laser unit and gain coefficient of an er-doped fiber amplifier are adjusted to obtain multi-wavelength laser.In the invention, the wavelength-fixed semiconductor laser unit and the wavelength-tunable semiconductor laser unit are respectively connected with a first photo-coupler; the first photo-coupler is connected with an input port fiber of a second photo-coupler; an output port of the second photo-coupler is connected with input port fiber of the er-doped fiber amplifier; the other output port of the second photo-coupler serves as the output port of the multi-wave laser.The laser obtained in the invention has the characteristics of long wavelength range, tunable wavelength interval and narrow bandwidth of single-wavelength laser.

Description

technical field [0001] The invention belongs to the field of laser technology, and in particular relates to a method for obtaining multi-wavelength laser light based on an enhanced four-wave mixing effect and equipment for realizing the method. Background technique [0002] In the field of laser technology, the emergence of fiber lasers has greatly improved the performance of lasers. Fiber lasers have the advantages of compact structure, fiber compatibility, low threshold, high efficiency, high beam quality and strong controllability of laser spectrum. The controllability of the laser spectrum of fiber lasers is mainly reflected in wavelength tuning, wavelength switching, and multi-wavelength laser output. These characteristics are not available in other types of lasers. Multi-wavelength laser has important application value in optical communication system, sensing system, industrial processing, monitoring and other fields, and has become a hot spot of people's attention da...

AI Technical Summary

Problems solved by technology

The multi-wavelength erbium-doped fiber laser has the most potential in the optical communication wavelength, and this type of laser faces a difficulty: the erbium-doped fiber at room temperature has a large uniform gain linewidth, so there is a strong gap between the multi-wavelength lasers. Instable output power due to gain competition

Although some technologies have been used to solve the problem of gain competition between different wavelengths of erbium-doped fiber lasers, the cost is relatively high

On the other hand, in the currently reported research schemes for obtaining multi-wavelength lasers, there is still a lack of wavelength interval control technology.

In the very few schemes that are in the laboratory research stage to achieve wavelength interval control, there are still serious problems that affect the application of multi-wavelength lasers, such as unstable wavelengths and too large a single laser bandwidth.

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