A photonic analog-to-digital conversion system and method based on an asymmetric digital encoding scheme

Abstract

The present invention proposes a photon analog-to-digital conversion system and method based on an asymmetrical digital encoding scheme. The femtosecond pulse laser provides a pulse light source, which is divided into two parallel sampling pulse sources by the first beam splitter, respectively in two electro-optical The modulator completes the sampling of the analog radio frequency signal, and at the same time adjusts the static bias voltage of the electro-optic modulator through the DC power supply to achieve the phase shift required by the system. The output of the first modulator is divided into K-beam signals by the second beam splitter, the output signals of the second beam splitter and the second modulator are photoelectrically converted by the photodetector, the threshold value is judged by the comparator array, and finally by A combinational logic block converts the comparator output to binary code. The conversion system of the present invention can significantly improve the bit accuracy of the system without increasing the number of modulators by increasing the comparison threshold, so that ordinary electro-optic modulators can be applied to photonic analog-to-digital conversion systems, and the structure is simple and easy operate.

Description

technical field [0001] The invention relates to the signal processing field of optical communication, in particular to a photon analog-to-digital conversion method and system for improving bit precision based on an asymmetric digital coding scheme. Background technique [0002] Analog-to-digital conversion devices (ADCs) are an indispensable bridge between analog sensors and digital signal processing systems. With the improvement of digital technology, high-speed analog-to-digital conversion technology has been extensively studied. It has great application prospects in national defense and civilian fields such as electronic reconnaissance, nuclear weapon monitoring, radar communication, aircraft navigation, digital instruments, high-precision television, and medical imaging. In recent years, with the continuous improvement of data acquisition and automatic detection, higher requirements have been placed on the performance of analog-to-digital conversion (bit precision, samp...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low bit precision in the traditional phase-shift optical quantization scheme, adopt an improved SNS (symmetrical digital system) coding scheme, and provide a photonic module with simple structure, easy integration, and improved bit precision. Number conversion system and conversion method

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