Device and method for generating broadband chaotic laser based on nonlinear optical fiber active optical feedback

Abstract

The present invention discloses a broadband chaotic laser generation apparatus and method based on nonlinear optical fiber active optical feedback. The apparatus comprises a semiconductor laser device, an optical circulator, a 1x2 fiber coupler, an optical amplifier, a highly nonlinear fiber, an attenuation controller, and a polarization controller. The continuous laser output from the semiconductor laser enters the optical amplifier through the optical circulator and the 1x2 fiber coupler; the laser is amplified by the optical amplifier and then enters the highly nonlinear optical fiber, so that a non-linear effect of the laser is generated; the laser passes through the attenuation controller and the polarization controller, and returns to the semiconductor laser device to form active optical feedback; and the active optical feedback is continuously amplified and cyclically oscillated in the fiber loop, and in combination with the non-linear effect, a broadband chaotic laser with a bandwidth of more than 50 GHz and a flatness of less than 3.5 dB is generated. The apparatus and method provided by the present invention are applicable to the fields of communication, sensing, information security and the like.

Description

technical field [0001] The invention relates to the field of optical feedback chaotic laser generation, in particular to a device and method for generating broadband chaotic laser based on nonlinear optical fiber active optical feedback, which is suitable for communication, sensing, information security and other fields. Background technique [0002] Chaotic lasers are widely used in the fields of chaotic secure communication, chaotic laser radar, high-speed random number generation, and distributed optical fiber sensing due to their noise-like and wide-spectrum characteristics. At present, the methods of using semiconductor lasers to generate chaotic laser include optical feedback, optical injection and photoelectric feedback. [0003] Due to its simple structure and easier to generate chaos, optical feedback has attracted extensive attention of researchers. However, since the relaxation oscillation of the laser occupies the main energy of the chaotic laser, the effective ...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of narrow bandwidth and uneven frequency spectrum of the chaotic laser produced by the existing optical feedback structure. The nonlinear effect produced by the highly nonlinear optical fiber in the path finally produces a broadband chaotic laser with a bandwidth exceeding 50GHz and a flatness less than 3.5dB

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