Optical feedback chaotic laser based on chirped fiber grating

Abstract

The invention discloses a chirped fiber grating-based optical feedback chaotic laser. Continuous light is output by the laser and is injected into a chirped fiber grating through a polarization controller, a fiber coupler and an optical attenuator in sequence; the reflected light which is obtained by reflecting the light through the chirped fiber grating and has the delay time corresponding to optical frequency is returned to the laser through the optical attenuator, the fiber coupler and the polarization controller along the same way to cause disturbance to the laser; and chaotic laser without time delay characteristics is generated through repetitive cycles. According to the laser, the time delay characteristics of the optical feedback chaotic laser are completely eliminated, and the privacy of chaotic communication, the accuracy of chaotic laser ranging and the randomness of a random number are improved; and the laser can be applied to the fields such as communication, remote sensing and sensing.

Description

technical field [0001] The invention is related to an optical feedback chaotic laser, and uses a chirped fiber grating as an optical feedback element to generate a chaotic signal without time-delay characteristic information. The chaotic signal can improve the secrecy of chaotic communication, the accuracy of distance measurement and the randomness of random numbers, and can be applied to the fields of communication, sensing, remote sensing and the like. Background technique [0002] Chaotic laser has high bandwidth and noise-like characteristics, and is widely used in secure communication, laser radar, optical time domain transmitter, optical coherence tomography, fast random number generator, etc. [0003] Chaotic lasers can be obtained by perturbing the laser. The traditional generation methods include mirror light feedback, light injection, photoelectric modulation and so on. Among them, the mirror optical feedback chaotic laser is favored in the application because of...

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Problems solved by technology

And due to the joint enhancement of the dispersion of the unchirped FBG, the delay characteristic decreases with the decrease of the bandwidth of the unchirped FBG, but in this method, the feedback delay time of different frequencies of light is the same, that is, the feedback delay is independent of the frequency, reaching The effect is that the delay characteristic of optical feedback can only be suppressed but not completely eliminated

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