Active-passive hybrid mode-locked optical pulse generator based on graphene saturable absorber

Abstract

The invention relates to an active and passive hybrid mode-locking optical pulse generator based on a graphene saturable absorber, and belongs to the technical field of an optical communication device. The main structure of the active and passive hybrid mode-locking optical pulse generator comprises an active mode-locking fiber laser resonant cavity, a passive mode-locking fiber laser system and a pulse optimization system, wherein the active mode-locking fiber laser resonant cavity comprises devices such as a pumping light source (1), a wavelength division multiplexer (2), a first optical coupler (3) and a first polarization controller (4), the passive mode-locking fiber laser system comprises devices such as a dispersion compensation fiber (21) and the graphene saturable absorber (22), and the pulse optimization system comprises two automatic feedback control rings. An active and passive hybrid mode-locking technology is employed, an optical detector is used for receiving a part of output laser, an amplification circuit is used for processing a received signal, the optimization on the output pulse of the whole system is achieved by controlling piezoelectric ceramic, so that the whole system generates stable, ultrashort and high-speed optical pulse, the active and passive hybrid mode-locking optical pulse generator is simple to operate, and accurate control can be achieved.

Description

technical field [0001] The invention belongs to the technical field of optical communication devices, in particular to an active-passive hybrid mode-locked optical pulse generator based on a graphene saturable absorber. Background technique [0002] With the rapid development of the national economy and the arrival of the information age, optical fiber communication technology has penetrated into various communication and information networks. Fiber lasers are ideal light sources for fiber optic communications and have many advantages over traditional solid-state lasers, and have been extensively studied in recent years. Mode-locked fiber lasers in fiber lasers are ideal for pulsed light sources in optical communication systems. [0003] Common structures of mode-locked fiber lasers include active mode-locked and passive mode-locked fiber lasers. Among them, the active mode-locked fiber laser has narrow output pulse width, small frequency chirp and tunable frequency, so it...

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Problems solved by technology

[0005] However, the output laser spectrum of active mode-locked fiber lasers is relatively narrow, and it is difficult to obtain ultra-narrow pulses. Moreover, the cavity length of active mode-locked fiber lasers is generally long, which is easily affected by the outside world, resulting in poor stability.

[0006] Passively mode-locked fiber laser has simple structure, low cost and high reliability. It is a real all-fiber device. Using the nonlinear effect of fiber, it can generate the shortest optical pulse, but its output pulse repetition frequency has poor stability and cannot be adjusted externally.

[0007] To sum up, the existing active or passive mode-locked fiber laser systems have their own inherent shortcomings, especially because the existing mode-locked fiber laser systems do not adopt effective automatic control, which makes the stability of the output optical pulse poor

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