A tunable mode-locked fiber laser based on fiber grating and graphene

Abstract

The invention discloses a tunable mode locking fiber laser based on a fiber grating and a grapheme. Tunable output of a linearity chamber fiber laser is realized based on a principle that a central wavelength of the fiber Bragg grating drifts along with strain linearity, and mode locking output of a linearity chamber fiber laser is realized based on a saturation absorption function of the grapheme with wide saturation absorption wave bands. The tunable mode locking fiber laser has advantages of full fiber structure, compact structure, stable performance, tunable broadband, wide application in the fields of fiber communication, fiber sensing, and the like and extensive applicability.

Description

technical field [0001] The invention relates to a tunable mode-locked fiber laser, and in particular provides a tunable mode-locked fiber laser based on fiber grating and graphene. Background technique [0002] Due to the ability to generate high-frequency ultrashort pulses, mode-locked fiber lasers have broad prospects in many fields such as optical communications, optical fiber sensing, detection and diagnosis, biomedicine, precision microprocessing, and military affairs. The mode-locking technology can be mainly divided into active mode-locking, passive mode-locking and hybrid mode-locking technology. [0003] Passive mode locking can realize ultrashort pulse output without using any active devices such as modulators in the laser cavity. The basic principle is to use the characteristics related to the response intensity of nonlinear devices to input optical pulses to realize the phase-locked to generate ultrashort light pulses. Saturable absorber mode locking is the mos...

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Problems solved by technology

[0006] At present, in order to realize the tunable mode-locked fiber laser, the active mode-locked method is adopted. In 1999, the article "10GHz Tunable Actively Mode-locked Fiber Laser" in "Acta Photonica Sinica" reported the solution to the instability of the actively mode-locked fiber laser. Solution, since active mode-locking technology requires LiNbO 3 The modulation frequency of the modulator matches the laser longitudinal mode interval quite accurately, but it is difficult to achieve in practical applications. For this purpose, the clock extraction circuit, phase controller and microwave amplifier are used to extract the electrical signal with appropriate frequency from the laser output, and then convert it to It is added to the modulator for modulation. From this, it can be seen that the number of devices used in active mode locking is large and complicated, and the whole system is very complicated.

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