Arbitrary mode accurate conversion method based on multiphase simulated annealing algorithm

Abstract

The present invention puts forward a method used for a mode division multiplexing optical fiber communication system and a network to achieve arbitrary mode conversion. The present invention puts forward an arbitrary mode accurate conversion method based on a multiphase simulated annealing algorithm by utilizing a Fourier optical analysis method and combining a spatial frequency spectrum filtering and matching principle. A spatial light modulator is used as a key device of frequency spectrum filtering at a transformation plane of a double-lens confocal system, and an optimal phase function is calculated through a simulated annealing algorithm, thereby effectively compensating an amplitude damage caused by a phase type spatial light modulator. When the phase of the spatial light modulator is changed at will, five phases are adopted, i.e., 0, pi / 2, pi, 3pi / 2 and 2pi. Compared with the simple 0 and pi, multiple phases can reduce diffraction caused by phase differences, and can improve the deficiency of slight rotation of an object mode field after two-phase simulated annealing. Numerical results show that the multiphase simulated annealing algorithm can achieve flexible mode conversion, and the conversion efficiency is raised from about 80% of the two-phase simulated annealing algorithm to more than 99%.

Description

technical field [0001] The invention relates to the field of mode division multiplexing optical fiber communication, more specifically, relates to an arbitrary mode accurate and perfect conversion method suitable for mode division multiplexing optical fiber communication system and network. Background technique [0002] In recent years, the rapid development of information technology has brought unprecedented changes to human life and economic development. Words related to information technology such as "Industry 4.0", "Big Data", "Smart City", "Ubiquitous Network" and "Web2.0" have become hot words in people's mouths in 2015. [0003] All of the above-mentioned new technologies and applications involve the generation, transmission, exchange, and processing of a large amount of information and data. These information and data are not only generated between people, but also through machines such as distributed computing, sensors, and cloud devices. Now the total amount has e...

AI Technical Summary

Problems solved by technology

The phase settings of these methods are all simple 0, π distribution, the phase difference between adjacent pixels is relatively large, the mode field after mode conversion will have obvious diffraction fringes, and the conversion accuracy is mostly only about 80%. There is still room for improvement

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