A device for generating broadband chaotic laser

Abstract

The invention discloses a device for generating a broadband chaotic laser. The chaotic laser output by a chaotic laser source 1 is divided into two paths: one is converted into an electrical domain chaotic signal by a photodetector, and then amplified by a radio frequency amplifier as a chaotic laser source The radio frequency input of the phase modulator in 2; the other channel is the broadband chaotic laser finally generated by the chaotic laser source 1; the output optical signal of the phase modulator in the chaotic laser source 2 is also divided into two channels: one channel is injected into the chaotic laser source 1. Semiconductor laser; the other channel is the broadband chaotic laser finally generated by chaotic laser source 2 after passing through a dispersion module.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and more particularly, relates to a device for generating broadband chaotic laser light. Background technique [0002] Chaos lasers have important applications in secure optical communication, high-speed physical random number generation, and high-resolution anti-jamming radar detection. Using broadband and large-amplitude chaotic laser as a carrier to hide information, and then using chaotic synchronization to demodulate information can realize encrypted communication of high-speed information; chaotic laser is used as a new generation of physics due to its high bandwidth and large-scale noise-like characteristics. The entropy source is used to solve the problem of insufficient real-time generation rate of physical random numbers; the use of broadband chaotic laser as a signal source to build a radar system can effectively improve the range resolution of target detection. [0003]...

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Problems solved by technology

[0004] However, after in-depth research, scholars have found that there are some defects in the chaotic laser generated by the external cavity semiconductor laser: (1) The external cavity semiconductor laser has obvious relaxation oscillations. From the power spectrum, the main energy of the chaotic laser is concentrated in the relaxation Therefore, the effective bandwidth and flatness of the power spectrum are limited; (2) due to the existence of external cavity resonance, the autocorrelation curve of the generated chaotic signal has an obvious correlation peak at the external cavity period, which is called is a time-delay label; the existence of these defects limits the practical application

[0005] In secure communication, the relaxation oscillation causes the bandwidth of chaotic laser to be only a few GHz. This limited bandwidth will limit the transmission rate of chaotic optical communication; at the same time, the time delay characteristic leaks the length of the external cavity, which leads to the interception to use this key structural information. Reconstruct the chaotic carrier signal, and then crack the transmitted information, weakening the security of the communication system

In the generation of physical random numbers, the limited entropy source bandwidth limits the rate of generated physical random numbers; the delay characteristics deteriorate the randomness and equalization ratio of 0 and 1 bits, and need to be optimized by complex post-processing

In terms of radar detection, limited bandwidth limits the improvement of chaotic laser detection distance resolution; time delay characteristics also reduce the security and anti-interference ability of radar systems

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