Pulse generation system for active and passive mixing locking die optical fiber laser

Abstract

The invention discloses a pulse generation system for an active and passive mixing locking die optical fiber laser, and belongs to the technical field of optical communication devices. The system has a main structure including an active locking die optical fiber laser resonance chamber which is composed of a pumping light source (1), a wavelength division multiplexer (2), a first photo-coupler (3), a polarizing controller (4) and the like, as well as a passive locking die optical fiber laser system which is composed of a dispersion compensating fiber (22), black phosphorus saturated absorber (21) and the like and a pulse optimizing system which is composed of two automatic feedback control rings. By adopting the active and passive mixing locking die technology, a part of output laser is received by a photodetector, an adjustable optical fiber delay line is controlled by utilizing feedback of a singlechip to realize optimization of output pulse of the whole system, so that stable ultra-short high-speed optical pulse of the whole system is produced, the operation is simple 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 fiber laser pulse generation system. 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 has great application pros...

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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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