Photon analog-to-digital conversion method and system based on weighted modulation curve

Abstract

The invention relates to a photon analog-to-digital conversion method and system based on a weighted modulation curve. The improvement of the quantification precision of the photon analog-to-digital conversion system is realized by combining a phase-shifting light quantification technology with a weighted multi-wavelength sampling pulse and employing a weighted modulation curve; according to the system, a weighted multi-wavelength pulse source is used for generating weighted multi-wavelength sampling optical pulses, and radio frequency analog signals are modulated to the weighted multi-wavelength sampling optical pulses through a Mach-Zehnder modulator; and modulation signals are connected into a dispersion element to achieve time domain walk-off of multi-wavelength pulses, then photoelectric conversion is conducted through the photoelectric detector, threshold comparison is conducted through the comparator, and therefore conversion from analog signals to digital signals is achieved. Compared with a traditional photon analog-to-digital conversion system, the scheme realizes uniform quantification of analog input signals by utilizing the weighted modulation curve, so that the bit precision of the photon analog-to-digital conversion system is improved, and meanwhile, the photon analog-to-digital conversion system is simple in structure and easy to realize.

Description

technical field [0001] The invention belongs to the technical field of optical communication signal processing, and in particular relates to a photon analog-to-digital conversion method and system based on a weighted modulation curve. Background technique [0002] Analog-to-digital converter (Analog-to-digital Converter, ADC) acts as a bridge between the analog world and the digital world. ADC plays a vital role in electronic products, precision instruments and aviation communications. In the past ten years, electronic ADCs have made great progress in increasing the sampling rate and resolution. However, with the emergence of applications such as radar systems, real-time monitoring, and medical imaging that require both large bandwidth and high resolution, the performance of traditional electronic ADCs has reached its limit. Due to the inherent limitations of electronics such as radio frequency delay, time jitter, and electromagnetic interference, traditional electronic ADC...

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Problems solved by technology

However, this scheme can only work in the case of small signal modulation, and it is necessary to control the MZM bias at the quadrature point and the modulation depth is small to achieve linear intensity modulation of the input analog signal

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