High-stability optical pulse generator

Abstract

The invention relates to a high-stability optical pulse generator and belongs to the technical field of optical communication devices. The high-stability optical pulse generator mainly comprises an active mode locking optical fiber laser resonant cavity composed of components of a pump light source (1), a wavelength division multiplexer (2), a first optical coupler (3) and a polarization controller (4), a passive mode locking optical fiber laser system composed of components of a dispersion compensation optical fiber (23) and a graphene saturable absorber (24) as well as a pulse optimization system composed of two automatic feedback control loops. The high-stability optical pulse generator provided by the invention has the advantages that an active and passive mixed mode locking technology is adopted, a receiving part of an optical detector is utilized for outputting lasers, a singlechip and an amplifying circuit are utilized for processing a received signal, a piezoelectric ceramic is controlled to realize optimization of an output pulse of the whole system, finally the whole system produces a stable ultrashort high-speed optical pulse, operation is simple, and accurate control can be achieved.

Description

technical field [0001] The invention belongs to the technical field of optical communication devices, and in particular relates to an optical pulse generator which utilizes an active-passive combined mode-locking technology to realize high-stability pulse output. 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 ...

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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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