KEYWORDS: Semiconductor lasers, Telecommunications, Optical communications, Modulation, Information security, Eye, Demodulation, Signal to noise ratio, Signal processing, Signal detection
Chaotic signals can be applied to confidential communications because of their noise-like, broad-spectrum and unpredictable properties. However, using the internal parameters of the laser as the key for communication is not only not easy to change, but also the key parameter space is limited. Therefore, increasing the key space is crucial for the security of chaotic confidential communication systems. In this paper, we propose to increase the key space of chaotic optical communication system by using multi-section semiconductor laser (MSSL), which increases the number of key parameters and increases the key space of the system. Finally, the validity of the ideas proposed in this paper is verified through experiments.
The oscillator is the core module of the radio frequency receiving front-end, which directly determines the signal processing capability of the communication system. Optoelectronic Oscillator (OEO) technology has become the main research direction to solve the indicators of improving phase noise and frequency tuning range of RF receiving front-end. In order to better solve the problem of RF reception, this paper studies the coupled opto-electronic oscillator, discusses its application in 5G communication systems, and discusses the voltage-controlled tunable fiber Fabry-Perot Coupled Optoelectronic Oscillator (FFP-COEO); Phase noise phase and frequency tuning model, the oscillator controls the cavity length of the Fabry-Perot cavity by voltage, and the starting frequency can be adjusted. The experimental results show that the oscillator can increase the secondary mode-locked loop by improving the filtering performance of the optical loop, further optimize the phase noise of the system, and improve the side mode suppression ratio and output power.
The processing quality of optical communication devices will affect the performance of the equipment. Therefore, it is necessary to carry out strict inspection on optical communication devices, and they can only leave the factory after passing the test. Judging from the current detection methods, the detection of optical communication devices mainly adopts manual detection methods, resulting in low detection efficiency and subjective influence on the detection results. Aiming at the problems existing in the detection of optical communication devices, this paper studies the defect detection technology of optical communication devices based on machine vision. This paper analyzes the main inspection items and indicators of optical communication devices, the composition of the inspection system and the main module structure, studies different template pairing methods, and designs the corresponding defect detection algorithm according to the imaging characteristics of components and bases on the product. The experimental results show that the components can be successfully matched under different conditions. The detection technology studied in this paper has a low rate of missed detection and false detection and has good defect detection stability and accuracy.
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