High-precision and high-stability temperature control system for chaotic semiconductor laser

Abstract

The invention belongs to the technical field of high-precision temperature control of lasers. Most of the existing chaotic light sources are built by combining the semiconductor lasers with various external discrete optical elements, the structure is complex and is easily influenced by the environment, and the output wavelength and a threshold current are influenced by the change of the temperature, so that the output chaotic state of the laser is unstable. The invention provides a high-precision and high-stability temperature control system for a chaotic semiconductor laser. According to thepresent invention, two timers drive an H-bridge driving module, so that the stability and the reliability of the current of a semiconductor chilling plate are realized; the laser temperature change isfed back to a microcontroller module through a temperature feedback module to be compared with the set temperature, the obtained difference enables the laser temperature to rapidly reach the set temperature through a fuzzy PID algorithm, and the current direction of the semiconductor chilling plate is stably changed, so that the dead-zone-free control over the temperature is achieved.

Description

technical field [0001] The invention relates to a high-precision and high-stability temperature control system for lasers, and more specifically, to a high-precision and high-stability temperature control system for chaotic semiconductor lasers. Background technique [0002] As a special output form of lasers with inherent randomness, initial value sensitivity, and wide frequency spectrum, chaotic lasers are used in chaotic and secure optical communications, high-speed physical random number (key) generation, high-precision optical network fault detection, anti-corrosion Alarm radar, ultra-wideband technology and distributed optical fiber sensing have important applications in many fields, and chaotic light sources are the core components of their applications in various fields. Most of the existing chaotic light sources are built on the laboratory bench using semiconductor lasers combined with various external discrete optical components. Gallium chloride, indium phosphide...

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Problems solved by technology

[0003] At present, the existing semiconductor laser temperature control system does not propose a specific high-precision adjustment method. For example, the publication number CN110244798A is an adaptive temperature control system for laser pointing devices. The system uses dual parameters of temperature and power to monitor the temperature change of the laser and perform Adjustment, when the temperature error or power error is small, the introduction of integral adjustment can achieve high-precision control, but the integral adjustment can effectively reduce the steady-state error and stabilize the laser temperature, but how to reflect the high-precision adjustment is not mentioned in the invention

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