Asymmetric digital coding scheme based photon analogue-digital conversion system and method

Abstract

The invention discloses an symmetric digital coding scheme based photon analogue-digital conversion system and method. A femtosecond pulsed laser provides pulse light source which is divided into twopaths of parallel sampling pulse source by a first beam splitter; collection of analogue radio-frequency signals is finished respectively at two photoelectric modulators; and phase shift needed by thesystem is realized by using a DC power source to adjust a static bias voltage of the photoelectric modulator. The output of the first modulator is divided into K beams of signals by a second beam splitter; output signals of the second beam splitter and the second modulator are subjected to photoelectric conversion by a photoelectric detector; threshold judgement is carried out by a comparator array and finally the output of the comparator is converted into a binary code by a combinatory logic module. The conversion system can improve the bit precision of the system remarkably on the basis ofnot adding the number of the modulator by using the method of adding threshold comparison, and a common electro-optical modulator can be applied to a photon analogue-digital conversion system; and thesymmetric digital coding scheme based photon analogue-digital conversion system is simple in structure and easy to 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

Images